0001622536-26-000036 | 10-Q | XBRL Viewer

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

7. Property, Plant and Equipment


		March 31, 2026						December 31, 2025
	Estimated Useful Life (years)	Gross Value		Accumulated Depreciation		Carrying Value		Gross Value		Accumulated Depreciation		Carrying Value
Electric generation	3-37	$	7,514	$	(555)	$	6,959	$	7,522	$	(481)	$	7,041
Nuclear fuel	1-6	517		(236)		281		403		(213)		190
Other property and equipment	3-24	67		(12)		55		63		(11)		52

Capitalized software	1-5	10		(5)		5		10		(5)		5
Construction work in progress		199		—		199		258		—		258
Property, plant and equipment, net		$	8,307	$	(808)	$	7,499	$	8,256	$	(710)	$	7,546

The components of “Depreciation, amortization and accretion” presented on the Consolidated Statements of Operations for the periods were:


	Three Months Ended March 31,
		2026		2025
Depreciation expense (a)		$	77	$	55
Amortization expense (b)		1		5
Accretion expense (c)		14		14

Depreciation, amortization and accretion		$	92	$	74

__________________

(a)Electric generation and other property and equipment.

(b)Intangible assets and capitalized software.

(c)ARO and accrued environmental cost accretion. See Note 8 for additional information.

The cost of nuclear fuel and the amortization of nuclear fuel intangible assets are presented as “Nuclear fuel amortization” on the Consolidated Statements of Operations.

Risk Management, Derivative Instruments and Hedging Activities - Balance Sheets Presentation (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Derivative asset, current	$ 33	$ 56
Derivative liability, current	250	101
Derivative asset, noncurrent	10	4
Derivative liability, noncurrent	49	67
Commodity derivatives
Derivative [Line Items]
Derivative asset, current	32	56
Derivative liability, current	248	97
Derivative asset, noncurrent	10	4
Derivative liability, noncurrent	40	59
Interest rate derivatives
Derivative [Line Items]
Derivative asset, current	1	0
Derivative liability, current	2	4
Derivative asset, noncurrent	0	0
Derivative liability, noncurrent	$ 9	$ 8

Fair Value

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Fair Value

11. Fair Value

Recurring Fair Value Measurements

Financial assets and liabilities reported at fair value on a recurring basis primarily include energy commodity derivatives, interest rate derivatives, and investments held within the NDT. See Note 1 to the Annual Financial Statements for additional descriptions on fair value levels.

The classifications of recurring fair value measurements within the fair value hierarchy were:



	March 31, 2026								December 31, 2025
	Level 1		Level 2		NAV		Netting (a)		Total		Level 1		Level 2		NAV		Netting (a)		Total
Assets
Cash equivalents	$	—	$	—	$	16	$	—	$	16	$	—	$	—	$	16	$	—	$	16
Equity securities (b)	838		—		234		—		1,072		871		—		234		—		1,105
U.S. government debt securities	264		120		—		—		384		297		102		—		—		399
Municipal debt securities	—		97		—		—		97		—		101		—		—		101
Corporate debt securities	—		294		—		—		294		—		277		—		—		277

Receivables (payables), net (c)	—		—		—		—		6		—		—		—		—		2
NDT funds	1,102		511		250		—		1,869		1,168		480		250		—		1,900

Commodity derivatives	514		95		—		(567)		42		361		95		—		(396)		60
Interest rate derivatives	—		1		—		—		1		—		—		—		—		—
Total assets	$	1,616	$	607	$	250	$	(567)	$	1,912	$	1,529	$	575	$	250	$	(396)	$	1,960

Liabilities
Commodity derivatives	$	591	$	315	$	—	$	(618)	$	288	$	407	$	189	$	—	$	(440)	$	156
Interest rate derivatives	—		11		—		—		11		—		12		—		—		12

Total liabilities	$	591	$	326	$	—	$	(618)	$	299	$	407	$	201	$	—	$	(440)	$	168

__________________

(a)Amounts represent netting pursuant to master netting arrangements and cash collateral held or placed with the same counterparty.

(b)Includes fixed income funds and real estate investment trusts.

(c)Represents: (i) interest and dividends earned but not received; and (ii) net sold or purchased investments, but not settled.

There were no recurring fair value measurements classified as Level 3 as of March 31, 2026 and December 31, 2025.

Nonrecurring Fair Value Measurements

There were no nonrecurring fair value measurements related to impairments of long-lived assets during the three months ended March 31, 2026 and 2025.

Reported Fair Value

The carrying value of certain financial assets and liabilities on the Consolidated Balance Sheets, including “Cash and cash equivalents,” “Restricted cash and cash equivalents,” “Accounts receivable,” and “Accounts payable and other accrued liabilities” approximate fair value.

The carrying value and fair value of indebtedness presented on the Consolidated Balance Sheets were:



	March 31, 2026				December 31, 2025
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt (a)	$	6,807	$	6,970	$	6,811	$	7,069

__________________

(a)Aggregate value of “Long-term debt” and “Long-term debt, due within one year” presented on the Consolidated Balance Sheets.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 3: http://www.xbrl.org/2003/role/exampleRef
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-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 940
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

Inventory (Tables)

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Schedule of Inventory



	March 31, 2026		December 31, 2025
Coal	$	73	$	94
Oil products	41		57
Fuel inventory for electric generation	114		151
Materials and supplies, net	128		124
Environmental products	2		3
Inventory, net	$	244	$	278

Supplemental Cash Flow Information - Schedule of Reconciliation of Cash and Cash Equivalents and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 1,025	$ 689
Restricted cash and cash equivalents	2	63
Total	$ 1,027	$ 752	$ 320	$ 365

Risk Management, Derivative Instruments and Hedging Activities - Statements of Operations Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gain (loss) on commodity contracts	$ (154)	$ (182)
Realized and unrealized gain (loss) on interest rate contracts	(439)	(268)
Interest rate derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized and unrealized gain (loss) on interest rate contracts	2	(13)
Energy Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain (loss) on commodity contracts	(327)	(27)
Fuel and Energy Purchases
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain (loss) on commodity contracts	52	24
Operating Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gain (loss) on commodity contracts	(112)	(241)
Energy Expenses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gain (loss) on commodity contracts	$ (42)	$ 59

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Asset Retirement Obligations and Accrued Environmental Costs - Schedule of Disaggregation of Asset Retirement Obligations (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Asset Retirement Obligation [Line Items]
Asset retirement obligations	$ 522	$ 514
Nuclear
Asset Retirement Obligation [Line Items]
Asset retirement obligations	281	272
Non-nuclear
Asset Retirement Obligation [Line Items]
Asset retirement obligations	$ 241	$ 242

Fair Value - Schedule of Recurring Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Assets
Cash equivalents	$ 16	$ 16
Equity securities	1,072	1,105
Debt securities	775	777
Receivables (payables), net	6	2
NDT funds	1,869	1,900
Derivative assets, netting	(567)	(396)
Total assets	1,912	1,960
Liabilities
Derivative liabilities, netting	(618)	(440)
Total liabilities	299	168
Commodity derivatives
Assets
Derivative assets, netting	(567)	(396)
Derivative assets, total	42	60
Liabilities
Derivative liabilities, netting	(618)	(440)
Derivative liabilities, total	288	156
Interest rate derivatives
Assets
Derivative assets, total	1	0
Liabilities
Derivative liabilities, total	11	12
U.S. government debt securities
Assets
Debt securities	384	399
Municipal debt securities
Assets
Debt securities	97	101
Corporate debt securities
Assets
Debt securities	294	277
Level 1
Assets
Cash equivalents	0	0
Equity securities	838	871
NDT funds	1,102	1,168
Total assets	1,616	1,529
Liabilities
Total liabilities	591	407
Level 1 \| Commodity derivatives
Assets
Derivative assets	514	361
Liabilities
Derivative liabilities	591	407
Level 1 \| Interest rate derivatives
Assets
Derivative assets, total	0	0
Liabilities
Derivative liabilities	0	0
Level 1 \| U.S. government debt securities
Assets
Debt securities	264	297
Level 1 \| Municipal debt securities
Assets
Debt securities	0	0
Level 1 \| Corporate debt securities
Assets
Debt securities	0	0
Level 2
Assets
Cash equivalents	0	0
Equity securities	0	0
NDT funds	511	480
Total assets	607	575
Liabilities
Total liabilities	326	201
Level 2 \| Commodity derivatives
Assets
Derivative assets	95	95
Liabilities
Derivative liabilities	315	189
Level 2 \| Interest rate derivatives
Assets
Derivative assets, total	1	0
Liabilities
Derivative liabilities	11	12
Level 2 \| U.S. government debt securities
Assets
Debt securities	120	102
Level 2 \| Municipal debt securities
Assets
Debt securities	97	101
Level 2 \| Corporate debt securities
Assets
Debt securities	294	277
NAV
Assets
Cash equivalents	16	16
Equity securities	234	234
NDT funds	250	250
Total assets	250	250
Liabilities
Total liabilities	0	0
NAV \| Commodity derivatives
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
NAV \| Interest rate derivatives
Assets
Derivative assets, total	0	0
Liabilities
Derivative liabilities	0	0
NAV \| U.S. government debt securities
Assets
Debt securities	0	0
NAV \| Municipal debt securities
Assets
Debt securities	0	0
NAV \| Corporate debt securities
Assets
Debt securities	$ 0	$ 0

Fair Value (Tables)

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Schedule of Recurring Fair Value Measurements

The classifications of recurring fair value measurements within the fair value hierarchy were:



	March 31, 2026								December 31, 2025
	Level 1		Level 2		NAV		Netting (a)		Total		Level 1		Level 2		NAV		Netting (a)		Total
Assets
Cash equivalents	$	—	$	—	$	16	$	—	$	16	$	—	$	—	$	16	$	—	$	16
Equity securities (b)	838		—		234		—		1,072		871		—		234		—		1,105
U.S. government debt securities	264		120		—		—		384		297		102		—		—		399
Municipal debt securities	—		97		—		—		97		—		101		—		—		101
Corporate debt securities	—		294		—		—		294		—		277		—		—		277

Receivables (payables), net (c)	—		—		—		—		6		—		—		—		—		2
NDT funds	1,102		511		250		—		1,869		1,168		480		250		—		1,900

Commodity derivatives	514		95		—		(567)		42		361		95		—		(396)		60
Interest rate derivatives	—		1		—		—		1		—		—		—		—		—
Total assets	$	1,616	$	607	$	250	$	(567)	$	1,912	$	1,529	$	575	$	250	$	(396)	$	1,960

Liabilities
Commodity derivatives	$	591	$	315	$	—	$	(618)	$	288	$	407	$	189	$	—	$	(440)	$	156
Interest rate derivatives	—		11		—		—		11		—		12		—		—		12

Total liabilities	$	591	$	326	$	—	$	(618)	$	299	$	407	$	201	$	—	$	(440)	$	168

__________________

(a)Amounts represent netting pursuant to master netting arrangements and cash collateral held or placed with the same counterparty.

(b)Includes fixed income funds and real estate investment trusts.

(c)Represents: (i) interest and dividends earned but not received; and (ii) net sold or purchased investments, but not settled.

Schedule of Carrying Value and Fair Value of Indebtedness

The carrying value and fair value of indebtedness presented on the Consolidated Balance Sheets were:



	March 31, 2026				December 31, 2025
	Carrying Value		Fair Value		Carrying Value		Fair Value

Long-term debt (a)	$	6,807	$	6,970	$	6,811	$	7,069

__________________

(a)Aggregate value of “Long-term debt” and “Long-term debt, due within one year” presented on the Consolidated Balance Sheets.

Stock-Based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (benefit), net	$ (1)	$ 11
Income tax benefit	0	(3)
After-tax stock-based compensation expense (benefit), net	(1)	8
Stock-based compensation expense (benefit), net, liability-classified awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (benefit), net	(24)	0
Stock-based compensation expense (benefit), net, equity-classified awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (benefit), net	$ 23	$ 11

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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+ Details

Risk Management, Derivative Instruments and Hedging Activities - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Derivative [Line Items]
Aggregate credit exposure	$ 767
Credit exposure, net	$ 42
Total Net Credit Exposure \| Credit Concentration Risk \| Ten Largest Single Net Credit Exposures Account
Derivative [Line Items]
Concentration risk percentage	81.00%

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details

Inventory

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Inventory

5. Inventory



	March 31, 2026		December 31, 2025
Coal	$	73	$	94
Oil products	41		57
Fuel inventory for electric generation	114		151
Materials and supplies, net	128		124
Environmental products	2		3
Inventory, net	$	244	$	278

Commitments and Contingencies - Regulatory Matters (Details)	1 Months Ended
	Jan. 30, 2026 state auction	Dec. 31, 2024 filing	Oct. 31, 2024	Jun. 01, 2025 USD ($)	Apr. 30, 2025 MWd
Other Commitments [Line Items]
Requested delay duration			6 months
Number of FERC filings \| filing		2
Number of delivery years		2 years
Number of states in PJM \| state	13
Contract term	15 years
Number of auctions \| auction	2
Property, Plant, and Equipment, Brandon Shores
Other Commitments [Line Items]
Fixed-cost monthly payments				$ 145,000,000
Fixed-cost per day payments (dollars per MWd)				312
Monthly performance hold-back				5,000,000
Property, Plant, and Equipment, Wagner
Other Commitments [Line Items]
Fixed-cost monthly payments				35,000,000
Fixed-cost per day payments (dollars per MWd)				137
Monthly performance hold-back				$ 2,500,000
Minimum
Other Commitments [Line Items]
Collar on capacity price \| MWd					175
Maximum
Other Commitments [Line Items]
Collar on capacity price \| MWd					325

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Previous Year) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 81	$ (187)
Income tax benefit (expense)	$ (18)	$ 52
Effective income tax rate	22.20%	27.80%
Income tax benefit (expense) computed at the federal income tax statutory tax rate of 21%	$ (17)	$ 39
Additional tax benefit (expense) due to:
Permanent differences	(3)	6
State income taxes, net of federal benefit	(1)	5
NDT taxes	$ 3	$ 2
Federal income tax at statutory tax rate		21.00%

Stockholders' Equity - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,093	$ 1,387
Total Other Comprehensive Income (Loss)	(7)	2
Ending balance	1,073	1,180
Accumulated other comprehensive income (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(4)	(12)
Gains (losses) arising during the period	(9)	6
Reclassifications to Consolidated Statements of Operations	(2)	(2)
Income tax benefit (expense)	4	(2)
Total Other Comprehensive Income (Loss)	(7)	2
Ending balance	$ (11)	$ (10)

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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+ Details

Postretirement Benefit Obligations - Schedule of Net Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Postemployment Benefits [Abstract]
Postretirement benefits service cost	$ 1	$ 1
Postretirement benefit (gain) loss
Interest cost	16	17
Expected return on plan assets	(19)	(19)
Amortization of:
Postretirement prior service cost (credit)	(1)	(1)
Postretirement benefit (gain) loss, net	(4)	(3)
Net periodic defined benefit cost (credit)	$ (3)	$ (2)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2026

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

16. Supplemental Cash Flow Information

Supplemental information for the Consolidated Statements of Cash Flows for the periods was:


	Three Months Ended March 31,
	2026		2025
Cash paid (received) during the period
Interest and other finance charges, net of capitalized interest (a)	$	52	$	23
Income taxes, net	(4)		19

Unrealized (gain) loss on derivative instruments included on the Statements of Cash Flows
Commodity contracts	$	154	$	182
Interest rate swap contracts (interest expense)	(2)		14
Unrealized (gain) loss on derivative instruments	$	152	$	196

Depreciation, amortization and accretion included on the Statements of Cash Flows
Depreciation, amortization and accretion	$	92	$	74
Amortization of acquired fuel supply contract liabilities	(29)		—

Other	3		(2)
Depreciation, amortization and accretion	$	66	$	72

Reconciliation of other non-cash operating activities
Derivative option premium amortization	$	5	$	31













Other	(1)		(5)
Total	$	4	$	26

Non-cash investing activities
Accrued PP&E additions not paid at period end	$	15	$	12

__________________

(a)Capitalized interest was non-material for the three months ended March 31, 2026 and 2025

Cash and Restricted Cash

The following table provides a reconciliation of “Cash and cash equivalents” and “Restricted cash and cash equivalents” presented on the Consolidated Balance Sheets to such amounts shown on the Consolidated Statements of Cash Flows:



	March 31, 2026		December 31, 2025
Cash and cash equivalents	$	1,025	$	689
Restricted cash and cash equivalents (a)	2		63
Total	$	1,027	$	752

__________________

(a)Comprised of commodity exchange margin deposits.

Long-Term Debt and Other Credit Facilities (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Long-Term Debt



	Interest Rate (a)	March 31, 2026		December 31, 2025
TLB-1	6.15 %	$	846	$	848
TLB-2	6.15 %	839		842

TLB-3	5.67 %	1,197		1,200
Secured Notes	8.63 %	1,200		1,200
2034 Unsecured Notes	6.25 %	1,400		1,400
2036 Unsecured Notes	6.50 %	1,290		1,290
PEDFA 2009B Bonds	5.25 %	50		50
PEDFA 2009C Bonds	5.25 %	81		81

Total principal		6,903		6,911
Unamortized deferred financing costs and original issuance discounts		(96)		(100)
Total carrying value		6,807		6,811
Less: long-term debt, due within one year		29		29
Long-term debt		$	6,778	$	6,782

__________________

(a)Computed interest rate as of March 31, 2026.

Schedule of Revolving Credit and Other Facilities



		March 31, 2026								December 31, 2025
	Maturity	Committed Capacity (a)		Direct Cash Borrowings		LCs Issued		Unused Capacity		Direct Cash Borrowings		LCs Issued		Unused Capacity
RCF	December 2029	$	900	$	—	$	—	$	900	$	—	$	—	$	900
LCF	December 2027	1,100		—		445		655		—		448		652
Total		$	2,000	$	—	$	445	$	1,555	$	—	$	448	$	1,552

__________________

(a)RCF committed capacity can be used for direct cash borrowings and (or) LCs. Direct cash borrowings are not permitted under the LCF, which can only be used for LCs.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
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+ Details

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Schedule of Nonvested Performance Stock Units

Changes in non-vested PSUs during the three months ended March 31, 2026 were:


	Liability-Classified PSUs (a)	Equity-Classified PSUs	Total PSUs	Weighted-Average Grant Date Fair Value per Unit
Non-vested as of December 31, 2025	569,477	488,857	1,058,334	$	147.45
Granted	—	145,911	145,911	2,045.20



Non-vested as of March 31, 2026 (b)	569,477	634,768	1,204,245	$	583.67

_____________

(a)See description of liability-classified awards below.

(b)Represents the target number of PSUs. Subject to the PSU award agreements, the actual amount of PSUs earned by participants at vesting can range from 0% to 200% of the target number of PSUs based on the Company’s stock price performance. In addition, certain of the PSUs are eligible to earn an additional amount of Talen shares based on the incremental Company stock price performance in excess of the PSU targets. Assuming all non-vested PSUs vested on March 31, 2026 at the then current share price of the Company’s common stock the aggregate non-vested PSUs would be 1,405,355.

Schedule of Significant Inputs and Assumptions of Fair Value

The fair value of PSUs is determined using a Monte Carlo valuation methodology based on the fair value of the underlying stock price at the grant date. Significant inputs and assumptions used in the valuations of PSUs were:



						Three Months Ended March 31, 2026
Volatility (a)						40% - 50%
Expected term (in years)						2 - 3
Risk-free rate (b)						3.45% - 3.49%

__________________

(a) Derived from an option pricing method based on the average asset volatility of peer companies and the Company’s leverage ratio.

(b) Based on the U.S. constant maturity treasury rate with a term matching the expected time to the end of the performance measurement period.

Schedule of Nonvested Restricted Stock Units

Changes in non-vested RSUs during the three months ended March 31, 2026 were:


	Liability-Classified RSUs (a)	Equity-Classified RSUs	Total RSUs	Weighted-Average Grant Date Fair Value per Unit
Non-vested as of December 31, 2025	169,642	171,011	340,653	$	106.18
Granted	—	75,687	75,687	391.43



Non-vested as of March 31, 2026	169,642	246,698	416,340	$	193.70

_____________

(a)See description of liability-classified awards below.

Schedule of Stock-based Compensation Expense

Stock-based compensation expense presented as “General and administrative” on the Consolidated Statement of Operations was:


	Three Months Ended March 31,
		2026		2025

Stock-based compensation expense (benefit), net, liability-classified awards		$	(24)	$	—
Stock-based compensation expense (benefit), net, equity-classified awards		23		11
Income tax benefit		—		(3)
After-tax stock-based compensation expense (benefit), net		$	(1)	$	8

Schedule of Unrecognized Stock-Based Compensation Expense

Unrecognized stock-based compensation expense and related periods of recognition as of March 31, 2026 were:


	PSUs				RSUs
	Equity-Classified		Liability-Classified		Equity-Classified		Liability-Classified
Unrecognized stock-based compensation expense (a)	$	313	$	19	$	34	$	3
Weighted-average period of recognition (in years)	0.8		0.1		1.0		0.2

__________________

(a) Stock-based compensation expense related to liability-classified awards is subject to variability due to changes in their value through the settlement date.

Income Taxes (Tables)

3 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

The reconciliations of the effective tax rate for the periods were:


	Three Months Ended March 31,
		2026			2025
Income (loss) before income taxes		$	81		$	(187)
Income tax benefit (expense)		(18)			52
Effective tax rate		22.2		%	27.8		%
Income tax benefit (expense) computed at the federal income tax statutory tax rate of 21%		(17)			39
Additional tax benefit (expense) due to:

Permanent differences		(3)			6
State income taxes, net of federal benefit		(1)			5

NDT taxes		3			2





Income tax benefit (expense)		$	(18)		$	52

Condensed Consolidated Statements Of Equity (Unaudited) - USD ($)
$ in Millions

Total

Common stock shares

Additional paid-in capital

Accumulated earnings (deficit)

AOCI

Treasury Stock

Beginning balance (in shares) at Dec. 31, 2024

^[1]

45,962,000

Beginning balance at Dec. 31, 2024

$ 1,387

$ 1,725

$ (326)

$ (12)

$ 0

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net Income (Loss)

(135)

Other comprehensive income (loss)

$ 2

Share repurchase (in shares)

(452,130)

(452,000)

^[1]

Share repurchases

$ (85)

(85)

Retirement of treasury stock

(18)

(67)

Equity incentive plans

Ending balance (in shares) at Mar. 31, 2025

^[1]

45,510,000

Ending balance at Mar. 31, 2025

$ 1,180

1,718

(528)

(10)

Beginning balance (in shares) at Dec. 31, 2025

45,687,828

45,688,000

^[1]

Beginning balance at Dec. 31, 2025

$ 1,093

1,709

(612)

(4)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net Income (Loss)

Other comprehensive income (loss)

$ (7)

(7)

Share repurchase (in shares)

(300,000)

^[1]

Share repurchases

$ (101)

(101)

Retirement of treasury stock

(12)

(89)

101

Equity incentive plans (in shares)

^[1]

7,000

Equity incentive plans

$ 25

Ending balance (in shares) at Mar. 31, 2026

45,395,007

45,395,000

^[1]

Ending balance at Mar. 31, 2026

$ 1,073

$ 1,722

$ (638)

$ (11)

$ 0

[1]	Shares in thousands.

Business, Basis of Presentation, and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business, Basis of Presentation, and Summary of Significant Accounting Policies	1. Business, Basis of Presentation, and Summary of Significant Accounting Policies Organization and Operations Talen is a leading independent power producer and energy infrastructure company dedicated to powering the future. We own and operate approximately 13.1 GW of power infrastructure in the United States, including 2.2 GW of nuclear power and a significant dispatchable fossil fleet. We produce and sell electricity, capacity, and ancillary services into wholesale U.S. power markets, with our generation fleet principally located in the Mid-Atlantic, Ohio, and Montana. Talen is headquartered in Houston, Texas. Basis of Presentation and Principles of Consolidation These Interim Financial Statements, which are prepared in accordance with GAAP and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”) for Quarterly Reports on Form 10-Q, include: (i) the accounts of all controlled subsidiaries; (ii) elimination adjustments for intercompany transactions between controlled subsidiaries; (iii) any undivided interests in jointly owned facilities consolidated on a proportionate basis; and (iv) all adjustments considered necessary for a fair statement of the information set forth. All adjustments are of a normal recurring nature except as otherwise disclosed. Certain information and note disclosures have been condensed or omitted from the Interim Financial Statements in accordance with GAAP. These Interim Financial Statements and Notes thereto should be read in conjunction with the Annual Financial Statements and Notes thereto. The results of operations presented in our Interim Financial Statements are not necessarily indicative of the results to be expected for the full year or for other future periods because interim period results can be disproportionately influenced by operational developments, seasonality, and various other factors. Reclassifications. Certain amounts in the prior period financial statements were reclassified to conform to the current period’s presentation. The reclassifications did not affect operating income, net income, total assets, total liabilities, net equity, or cash flows. Use of Estimates. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Summary of Significant Accounting Policies See Note 1 to the Annual Financial Statements for additional information on significant accounting policies.

Risk Management, Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Risk Management, Derivative Instruments and Hedging Activities

2. Risk Management, Derivative Instruments and Hedging Activities

Risk Management Objectives

We are exposed to risks arising from our business, including but not limited to market and commodity price risk, credit and liquidity risk, and interest rate risk. The hedging strategies deployed by our commercial and treasury organizations manage and (or) balance these risks within a structured risk management program in order to minimize near-term future cash flow volatility. Our risk management committee, comprised of certain senior management members across the organization, oversees the management of these risks in accordance with our risk policy. In turn, the risk management committee is overseen by the risk committee of the Board of Directors.

The Board of Directors, including the risk committee, and management have established procedures to monitor, measure, and manage hedging activities and credit risk in accordance with the risk policy.

Key risk control activities, which are designed to ensure compliance with the risk policy, include, among other activities, credit review and approval, validation of transactions and market prices, verification of risk and transaction limits, portfolio stress tests, analysis and monitoring of margin at risk, and daily portfolio reporting.

Market and Commodity Price Risk. Volatility in the wholesale power markets provides uncertainty in the future earnings and cash flows of the business. The price risk Talen is exposed to includes the price variability associated with future sales and (or) purchases of power, natural gas, coal, uranium, oil products, environmental products, and other energy commodities in competitive wholesale markets. Several factors influence price volatility, including: (i) seasonal changes in demand; (ii) weather conditions; (iii) available regional load-serving supply; (iv) regional transportation and (or) transmission availability; (v) market liquidity; and (vi) federal, regional, and state regulations.

Within the parameters of our risk policy, we generally utilize exchange-traded and over-the-counter traded derivative instruments and, in certain instances, structured products, to economically hedge the commodity price risk of the forecasted future sales and purchases of commodities associated with our generation portfolio.

Open commodity purchase (sales) derivatives range in maturity through 2027. The net notional volumes of commodity derivatives were:



	March 31, 2026 (a)	December 31, 2025 (a)
Power (MWh)	(66,143,342)	(59,634,723)
Natural gas (MMBtu)	189,897,762	169,209,022
Emission allowances (tons)	—	—

__________________

(a)The volumes may be different than the contractual volumes, as the probability that option contracts will be exercised is considered in the volumes displayed.

Interest Rate Risk. Talen is exposed to interest rate risk from the possibility that changes in interest rates will affect future cash flows associated with existing floating rate debt issuances. To reduce interest rate risk, derivative instruments are utilized to economically hedge the interest rates for a predetermined contractual notional amount, which results in a cash settlement between counterparties. To the extent possible, first lien interest rate fixed-for-floating swaps are utilized to hedge this risk.

Open interest rate derivatives range in maturity through 2029. The net notional volumes of open interest rate derivatives were:



	March 31, 2026		December 31, 2025
Interest rate (in millions)	$	990	$	990

Credit Risk. Credit risk, which is the risk of financial loss if a customer, counterparty, or financial institution is unable to perform or pay amounts due, is applicable to cash and cash equivalents, restricted cash and cash equivalents, accounts receivable, and derivative instruments. The maximum amount of credit exposure associated with financial assets is equal to the carrying value of such assets. Credit risk, which cannot be completely eliminated, is managed through a number of practices such as ongoing reviews of counterparty creditworthiness, prepayment, inclusion of termination rights in contracts which are triggered by certain events of default, and executing master netting arrangements that permit amounts between parties to be offset. Additionally, credit enhancements such as cash deposits, LCs, and credit insurance may be employed to mitigate credit risk.

Cash and cash equivalents are placed in depository accounts or high-quality, short-term investments with major international banks and financial institutions. Individual counterparty exposure from over-the-counter derivative instruments is managed within predetermined credit limits and includes the use of master netting arrangements and cash-call margins, when appropriate, to reduce credit risk. Exchange-traded commodity contracts, which are executed through futures commission merchants, have minimal credit risk because they are subject to mandatory margin requirements and are cleared with an exchange. However, Talen is exposed to the credit risk of the futures commission merchants arising from daily variation margin cash calls. Restricted cash and cash equivalents deposited to meet initial margin requirements are held by futures commission merchants in segregated accounts for the benefit of Talen.

Outstanding accounts receivable include those from sales of capacity, generated electricity, and ancillary services through contracts directly with ISOs and RTOs and realized settlements of physical and financial derivative instruments with commodity marketers. Additionally, Talen carries accounts receivable due from joint owners for their portion of operating and capital costs for certain jointly owned facilities that are operated by the Company. The majority of outstanding receivables, which are continually monitored, have customary payment terms. The allowance for doubtful accounts was a non-material amount as of March 31, 2026 and December 31, 2025.

As of March 31, 2026, Talen’s aggregate credit exposure, which excludes the effects of netting arrangements, cash collateral, LCs, and any allowances for doubtful collections, was $767 million and its credit exposure including such netting effects was $42 million. Excluding ISO and RTO counterparties, whose accounts receivable settlements and congestion products are subject to applicable market controls, the ten largest single net credit exposures account for 81% of Talen’s total net credit exposure, which are primarily with entities assigned investment grade credit ratings.

Certain derivative instruments contain credit risk-related contingent features, which may require us to provide cash collateral, LCs, or guarantees from a creditworthy entity if the fair value of a liability eclipses a certain threshold or upon a decline in Talen’s credit rating. The fair values of derivative instruments in a net liability position, and that contain credit risk-related contingent features, were non-material as of March 31, 2026 and December 31, 2025.

Derivative Instrument Presentation

Balance Sheets Presentation. The fair value of derivative instruments presented within assets and liabilities on the Consolidated Balance Sheets were:



	March 31, 2026				December 31, 2025
	Assets		Liabilities		Assets		Liabilities
Commodity contracts	$	32	$	248	$	56	$	97
Interest rate contracts	1		2		—		4

Total current derivative instruments	33		250		56		101
Commodity contracts	10		40		4		59
Interest rate contracts	—		9		—		8
Total non-current derivative instruments	$	10	$	49	$	4	$	67

All commodity and interest rate derivatives are economic hedges where the changes in fair value are presented immediately in income as unrealized gains and losses. Changes in the fair value and realized settlements on commodity derivative instruments are presented as separate components of “Energy and other revenues” and “Fuel and energy purchases” on the Consolidated Statements of Operations. Changes in the fair value and realized settlements on interest rate derivative instruments are presented as “Interest expense and other finance charges” on the Consolidated Statements of Operations. See Note 11 for additional information on fair value of commodity and interest rate derivatives.

Effect of Netting. Generally, the right of setoff within master netting arrangements permits the fair value of derivative assets to be offset with derivative liabilities. As an election, derivative assets and derivative liabilities are presented on the Consolidated Balance Sheets with the effect of such permitted netting as of March 31, 2026 and December 31, 2025.

The net amounts of “Derivative instruments” presented as assets and liabilities on the Consolidated Balance Sheets considering the effect of permitted netting and where cash collateral is pledged in accordance with the underlying agreement were:


	Gross Derivative Instruments		Eligible for Offset		Net Derivative Instruments		Collateral (Posted) Received		Net Amounts
March 31, 2026
Assets	$	610	$	(552)	$	58	$	(15)	$	43
Liabilities	917		(552)		365		(66)		299
December 31, 2025
Assets	$	456	$	(396)	$	60	$	—	$	60
Liabilities	608		(396)		212		(44)		168

Statements of Operations Presentation. The location and pre-tax effect of “Derivative instruments” presented on the Consolidated Statements of Operations for the periods were:


	Three Months Ended March 31,
		2026		2025
Realized gain (loss) on commodity contracts
Energy revenues (a)		$	(327)	$	(27)
Fuel and energy purchases (a)		52		24
Unrealized gain (loss) on commodity contracts
Operating revenues (b)		(112)		(241)
Energy expenses (b)		(42)		59
Realized and unrealized gain (loss) on interest rate contracts
Interest expense and other finance charges		2		(13)

__________________

(a)Does not include those derivative instruments that settle through physical delivery.

(b)Presented as “Unrealized gain (loss) on derivative instruments” on the Consolidated Statements of Operations.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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+ Details

Stock-Based Compensation

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

13. Stock-Based Compensation

In June 2023, TEC began granting performance stock units (“PSUs”) and restricted stock units (“RSUs”) to certain employees and non-employee directors under the Company’s 2023 Equity Incentive Plan (the “Equity Plan”). The aggregate number of shares authorized for issuance under the Equity Plan is 7,083,461 shares of common stock.

Performance Stock Units

PSUs have two or three-year cliff vesting schedules or vest upon consummation of a change in control event based on the satisfaction of a continued employment condition and the achievement of certain market conditions over a performance period. Participants will be awarded additional PSUs if market conditions exceed targets at the time of vesting. If the Company declares any cash dividends while the PSUs are outstanding, participants will be credited a dividend, payable at the time of vesting, based on the number of shares of common stock underlying the PSUs.

Changes in non-vested PSUs during the three months ended March 31, 2026 were:


	Liability-Classified PSUs (a)	Equity-Classified PSUs	Total PSUs	Weighted-Average Grant Date Fair Value per Unit
Non-vested as of December 31, 2025	569,477	488,857	1,058,334	$	147.45
Granted	—	145,911	145,911	2,045.20



Non-vested as of March 31, 2026 (b)	569,477	634,768	1,204,245	$	583.67

_____________

(a)See description of liability-classified awards below.



						Three Months Ended March 31, 2026
Volatility (a)						40% - 50%
Expected term (in years)						2 - 3
Risk-free rate (b)						3.45% - 3.49%

__________________

(a) Derived from an option pricing method based on the average asset volatility of peer companies and the Company’s leverage ratio.

(b) Based on the U.S. constant maturity treasury rate with a term matching the expected time to the end of the performance measurement period.

Restricted Stock Units

RSUs have two or three-year ratable or two-year cliff vesting schedules beginning on the grant date, with restrictions on transferring settled shares prior to the final scheduled vesting date for the two and three-year awards. The fair value of RSUs granted is based on the closing price of TEC common stock on the grant date.

Changes in non-vested RSUs during the three months ended March 31, 2026 were:


	Liability-Classified RSUs (a)	Equity-Classified RSUs	Total RSUs	Weighted-Average Grant Date Fair Value per Unit
Non-vested as of December 31, 2025	169,642	171,011	340,653	$	106.18
Granted	—	75,687	75,687	391.43



Non-vested as of March 31, 2026	169,642	246,698	416,340	$	193.70

_____________

(a)See description of liability-classified awards below.

Liability-classified Awards

PSU and RSU awards of certain executive officers that are scheduled to vest in 2026 will be partially settled in cash. Generally, the cash settlement amount will equal up to 60% of the net after-tax value on the vesting date of each such award. However, the cash settlement amount is subject to a cap. Additionally, it is expected that non-employee directors could elect to net-settle a portion of their vested PSUs and RSUs for the payment of income taxes. The portion of each employee’s applicable awards that are expected to be settled in cash and all non-employee director awards are presented as “Stock-based compensation liabilities” on the Consolidated Balance Sheets and had a carrying value of $477 million, measured based on the closing share price of TEC common stock of $319.23 as of March 31, 2026.

Stock-based Compensation Expense

Stock-based compensation expense presented as “General and administrative” on the Consolidated Statement of Operations was:


	Three Months Ended March 31,
		2026		2025

Stock-based compensation expense (benefit), net, liability-classified awards		$	(24)	$	—
Stock-based compensation expense (benefit), net, equity-classified awards		23		11
Income tax benefit		—		(3)
After-tax stock-based compensation expense (benefit), net		$	(1)	$	8

Unrecognized stock-based compensation expense and related periods of recognition as of March 31, 2026 were:


	PSUs				RSUs
	Equity-Classified		Liability-Classified		Equity-Classified		Liability-Classified
Unrecognized stock-based compensation expense (a)	$	313	$	19	$	34	$	3
Weighted-average period of recognition (in years)	0.8		0.1		1.0		0.2

__________________

(a) Stock-based compensation expense related to liability-classified awards is subject to variability due to changes in their value through the settlement date.

Condensed Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating revenues	$ 1,129	$ 390
Fuel and energy purchases	(563)	(268)
Nuclear fuel amortization	(24)	(26)
Unrealized gain (loss) on derivative instruments (Note 2)	(42)	59
Energy Expenses	(629)	(235)
Operating Expenses
Operation, maintenance and development	(165)	(146)
General and administrative	(24)	(34)
Depreciation, amortization and accretion (Note 7)	(92)	(74)
Other operating income (expense), net	(9)	(7)
Operating Income (Loss)	210	(106)
Nuclear decommissioning trust funds gain (loss), net (Note 6)	(22)	(12)
Interest expense and other finance charges (Note 10)	(119)	(74)
Other non-operating income (expense), net	12	5
Income (Loss) Before Income Taxes	81	(187)
Income tax benefit (expense) (Note 4)	(18)	52
Net Income (Loss)	$ 63	$ (135)
Per Common Share
Net Income (Loss) Attributable to Stockholders - Basic (in dollars per share)	$ 1.38	$ (2.94)
Net Income (Loss) Attributable to Stockholders - Diluted (in dollars per share)	$ 1.33	$ (2.94)
Weighted-Average Number of Common Shares Outstanding - Basic (in shares)	45,612	45,849
Weighted-Average Number of Common Shares Outstanding - Diluted (in shares)	47,431	45,849
Energy and other revenues
Operating revenues	$ 1,034	$ 582
Capacity revenues
Operating revenues	207	49
Unrealized gain (loss) on derivative instruments (Note 2)
Operating revenues	$ (112)	$ (241)

Nuclear Decommissioning Trust Funds - Schedule of Sales Proceeds, Gains, and Losses for Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Sales proceeds of NDT funds investments	$ 80	$ 576
Realized gains	1	3
Realized losses	$ 0	$ (2)

Stock-Based Compensation - Schedule of Significant Inputs and Assumptions of Fair Value (Details) - Performance stock units	3 Months Ended
	Mar. 31, 2026
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum volatility	40.00%
Maximum volatility	50.00%
Risk-free rate, minimum	3.45%
Risk-free rate, maximum	3.49%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	3 years

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Stockholder's Equity - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Nov. 25, 2025	Sep. 30, 2025
Equity [Abstract]
Share repurchase program, remaining authorized amount	$ 1,900	$ 2,000	$ 995
Percentage of common stock purchased	24.00%
Stock repurchased, excluding excise tax	$ 2,100

Long-Term Debt and Other Credit Facilities - Schedule of Revolving Credit and Other Facilities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Committed capacity	$ 2,000
Unused Capacity	1,555	$ 1,552
Revolving Credit Facility
Debt Instrument [Line Items]
LCs Issued	0	0
Letter of Credit
Debt Instrument [Line Items]
LCs Issued	445	448
RCF \| Line of Credit
Debt Instrument [Line Items]
Committed capacity	900
Unused Capacity	900	900
RCF \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
LCs Issued	0	0
RCF \| Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
LCs Issued	0	0
LCF \| Line of Credit
Debt Instrument [Line Items]
Committed capacity	1,100
Unused Capacity	655	652
LCF \| Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
LCs Issued	$ 445	$ 448

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Commitments and Contingencies - Guarantees and Other Assurances (Details) - Surety Bond - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Other Commitments [Line Items]
Surety bonds	$ 211	$ 228
Subsidiary, TES
Other Commitments [Line Items]
Surety bonds	$ 103	$ 114

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	350,000,000	350,000,000
Shares issued (in shares)	45,395,007	45,687,828
Shares outstanding (in shares)	45,395,007	45,687,828

Business, Basis of Presentation, and Summary of Significant Accounting Policies (Details)	Mar. 31, 2026 GW
Property, Plant and Equipment [Line Items]
Generation capacity	13.1
Nuclear fuel
Property, Plant and Equipment [Line Items]
Generation capacity	2.2

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Schedule of Components of Depreciation, Amortization and Accretion Expense


		March 31, 2026						December 31, 2025
	Estimated Useful Life (years)	Gross Value		Accumulated Depreciation		Carrying Value		Gross Value		Accumulated Depreciation		Carrying Value
Electric generation	3-37	$	7,514	$	(555)	$	6,959	$	7,522	$	(481)	$	7,041
Nuclear fuel	1-6	517		(236)		281		403		(213)		190
Other property and equipment	3-24	67		(12)		55		63		(11)		52

Capitalized software	1-5	10		(5)		5		10		(5)		5
Construction work in progress		199		—		199		258		—		258
Property, plant and equipment, net		$	8,307	$	(808)	$	7,499	$	8,256	$	(710)	$	7,546

The components of “Depreciation, amortization and accretion” presented on the Consolidated Statements of Operations for the periods were:


	Three Months Ended March 31,
		2026		2025
Depreciation expense (a)		$	77	$	55
Amortization expense (b)		1		5
Accretion expense (c)		14		14

Depreciation, amortization and accretion		$	92	$	74

__________________

(a)Electric generation and other property and equipment.

(b)Intangible assets and capitalized software.

(c)ARO and accrued environmental cost accretion. See Note 8 for additional information.

Stock-Based Compensation - Schedule of Unrecognized Stock-Based Compensation Expense (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Equity-Classified PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 313
Weighted-average period of recognition (in years)	9 months 18 days
Liability-Classified PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 19
Weighted-average period of recognition (in years)	1 month 6 days
Equity-Classified RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 34
Weighted-average period of recognition (in years)	1 year
Liability-Classified PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 3
Weighted-average period of recognition (in years)	2 months 12 days

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Asset Retirement Obligations and Accrued Environmental Costs (Tables)

3 Months Ended

Mar. 31, 2026

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations and Accrued Environmental Costs

The carrying value of AROs and accrued environmental costs were:



	March 31, 2026		December 31, 2025
Asset retirement obligations	$	522	$	514
Accrued environmental costs	20		20
Total asset retirement obligations and accrued environmental costs	542		534
Less: asset retirement obligations and accrued environmental costs due within one year (a)	46		40

Asset retirement obligations and accrued environmental costs due after one year	$	496	$	494

__________________

(a)Presented as “Other current liabilities” on the Consolidated Balance Sheets.

Schedule of Changes in Asset Retirement Obligations

The changes of the ARO carrying value during the period were:



	2026
Carrying value January 1,	$	514

Obligations settled	(6)
Accretion expense	14


Carrying value, March 31,	$	522

Schedule of Disaggregation of Asset Retirement Obligations

The disaggregation of ARO carrying values on the Consolidated Balance Sheets was:



	March 31, 2026		December 31, 2025

Nuclear (a)	$	281	$	272
Non-nuclear (b)	241		242
Carrying value	$	522	$	514

__________________

(a)Obligations are expected to be settled with available funds in the NDT at the time of decommissioning. See Note 6 for additional information on the NDT.

(b)Certain obligations are: (i) partially supported by surety bonds, some of which have been collateralized with LCs; or (ii) partially prefunded under phased installment agreements.

Nuclear Decommissioning Trust Funds (Tables)

3 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

Schedule of Unrealized Gain (Loss) on Nuclear Decommissioning Trust Funds



	March 31, 2026								December 31, 2025
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Cash equivalents	$	16	$	—	$	—	$	16	$	16	$	—	$	—	$	16
Equity securities	388		706		(22)		1,072		385		739		(19)		1,105
Debt securities	780		4		(9)		775		773		7		(3)		777
Receivables (payables), net	6		—		—		6		2		—		—		2
NDT Funds	$	1,190	$	710	$	(31)	$	1,869	$	1,176	$	746	$	(22)	$	1,900

Schedule of Available-for-Sale Debt Securities With Unrealized Losses

The aggregate fair value of available-for-sale debt securities with unrealized losses as of March 31, 2026 was:


	Fair Value		Unrealized Losses
Corporate debt securities	$	198	$	(4)
Municipal debt securities	61		(1)
U.S. Government debt securities	271		(4)
Debt securities in unrealized loss position	$	530	$	(9)

Schedule of Maturities for Available-for-Sale Debt Securities

The contractual maturities for available-for-sale debt securities presented on the Consolidated Balance Sheets were:



	March 31, 2026		December 31, 2025
Maturities within one year	$	11	$	23
Maturities within two to five years	231		233
Maturities thereafter	533		521
Debt securities, fair value	$	775	$	777

Schedule of Sales Proceeds, Gains, and Losses for Available-for-Sale Debt Securities

The sales proceeds, gains, and losses for available-for-sale debt securities for the periods were:


	Three Months Ended March 31,
		2026		2025
Sales proceeds of NDT funds investments (a)		$	80	$	576
Realized gains		1		3
Realized losses		—		(2)

__________________

(a)Sales proceeds are used to pay income taxes and trust management fees. Remaining proceeds are reinvested in the NDT.

Schedule of Unrealized Gain (Loss) on Investments

The net unrealized gains and losses recognized associated with equity securities still held at the end of the reporting periods were:


	Three Months Ended March 31,
		2026		2025
Equity securities, unrealized gains (losses)		$	(36)	$	(24)

Income Taxes

3 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

Income Taxes

4. Income Taxes

Effective Tax Rate Reconciliations

The reconciliations of the effective tax rate for the periods were:


	Three Months Ended March 31,
		2026			2025
Income (loss) before income taxes		$	81		$	(187)
Income tax benefit (expense)		(18)			52
Effective tax rate		22.2		%	27.8		%
Income tax benefit (expense) computed at the federal income tax statutory tax rate of 21%		(17)			39
Additional tax benefit (expense) due to:

Permanent differences		(3)			6
State income taxes, net of federal benefit		(1)			5

NDT taxes		3			2





Income tax benefit (expense)		$	(18)		$	52

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 5: http://www.xbrl.org/2003/role/exampleRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Earnings Per Share

EPS for the periods were:


	Three Months Ended March 31,
		2026		2025
Numerator: (Millions of Dollars)
Net Income (Loss)		$	63	$	(135)




Denominator: (Thousands)
Weighted-Average Number of Common Shares Outstanding - Basic		45,612		45,849

Restricted stock units		186		—
Performance stock units		1,633		—
Weighted-Average Number of Common Shares Outstanding - Diluted		47,431		45,849

Earnings per Share - Basic		$	1.38	$	(2.94)
Earnings per Share - Diluted		1.33		(2.94)

Segments

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Segments

18. Segments

Talen’s operating segments are based on the market areas in which our generation facilities operate and reflect the manner in which our Chief Executive Officer, who is the chief operating decision maker (the “CODM”), reviews results. Adjusted EBITDA is the key profit metric used by the CODM to review segment performance and allocate resources as it provides a clearer view of segment profitability by focusing on operational performance. Total assets or other asset metrics are not considered a key metric or reviewed by the chief operating decision maker.

“PJM” represents electricity generation, marketing activities, and commodity risk and fuel management within the PJM market and is comprised of Susquehanna and Talen’s natural gas and coal generation facilities in PJM.

“Other” represents an operating segment that includes the operating and marketing activities of Talen Montana’s proportionate share of Colstrip in the WECC market and other non-material operating and development activities.

“Corporate and Eliminations” represents a non-reportable segment that includes: (i) general and administrative expenses incurred by our corporate function; (ii) interest expense and other corporate activities not allocated to our operating segments; and (iii) intercompany eliminations. This grouping is presented to reconcile the reportable segments to our consolidated results.


	PJM		Other		Corporate and Eliminations		Total
Three Months Ended March 31, 2026
Operating revenues	$	1,110	$	28	$	(9)	$	1,129
Operation, maintenance and development expenses (a)	158		7
Interest expense and other finance charges	—		—		119		119
Other segment items (b)	473
Adjusted EBITDA	479
Capital expenditures	67		2		—		69

Three Months Ended March 31, 2025
Operating revenues	$	367	$	42	$	(19)	$	390
Operation, maintenance and development expenses (a)	138		8
Interest expense and other finance charges	—		—		74		74
Other segment items (b)	20
Adjusted EBITDA	209
Capital expenditures	62		1		1		64

__________________

(a)This significant segment expense category aligns with the segment-level information that is regularly reviewed by the CODM.

(b)Other segment items are primarily comprised of fuel and energy purchases.

Reconciliation of segment Adjusted EBITDA to Income (Loss) Before Income Taxes:


	Three Months Ended March 31,
		2026		2025

PJM Segment Adjusted EBITDA		$	479	$	209


Reconciling Items:
Interest expense and other finance charges		$	(119)	$	(74)
Depreciation, amortization and accretion (a)		(63)		(70)
Nuclear fuel amortization (a)		(24)		(26)

Unrealized gain (loss) on commodity derivative contracts		(154)		(182)
Nuclear decommissioning trust funds gain (loss), net		(22)		(12)
Stock-based and other long-term incentive compensation expense		(2)		(13)





Acquisition and divestiture activities (b)		(1)		(7)


Operational and other restructuring activities (c)		(9)		(2)




"Other" operating segment		9		9

Corporate and Eliminations		(15)		(18)
Other items		2		(1)
Income (Loss) Before Income Taxes		$	81	$	(187)

__________________

(a)Includes the periodic amortization of fair value adjustments associated with acquired fuel supply contract liabilities and intangible assets.

(b)Includes the non-recurring: (i) advisory fees associated with completed acquisitions and divestitures; (ii) remaining settlements on contracts of divested assets; and (iii) non-recurring finance fees charged to the Consolidated Statement of Operations associated with acquisition financing fee arrangements.

(c)Non-recurring severance and retention costs and strategic initiative costs.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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+ Details

Stockholders' Equity - Components of AOCI (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total Equity	$ 1,073	$ 1,093	$ 1,180	$ 1,387
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total Equity	(11)	$ (4)	(10)	$ (12)
Available-for-sale securities unrealized gain (loss), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total Equity	(4)		0
Postretirement benefit prior service credits (costs), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total Equity	11		13
Postretirement benefit actuarial gain (loss), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total Equity	$ (18)		$ (23)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

+ References

+ Details

Postretirement Benefit Obligations

3 Months Ended

Mar. 31, 2026

Postemployment Benefits [Abstract]

Postretirement Benefit Obligations

12. Postretirement Benefit Obligations

TES and certain subsidiaries sponsor postemployment benefits which include defined benefit pension plans, health and welfare postretirement plans (other postretirement benefit plans), and a defined contribution plan.

The components of net periodic benefit costs for the periods were:


	Three Months Ended March 31,
		2026		2025
Postretirement benefits service cost (a)		$	1	$	1

Postretirement benefit (gain) loss
Interest cost		$	16	$	17
Expected return on plan assets		(19)		(19)

Amortization of:
Postretirement prior service cost (credit)		(1)		(1)

Postretirement benefit (gain) loss, net (b)		$	(4)	$	(3)

Net periodic defined benefit cost (credit)		$	(3)	$	(2)

_____________

(a)Activity presented as “Operation, maintenance and development” on the Consolidated Statements of Operations.

(b)Activity presented as “Other non-operating income (expense), net” on the Consolidated Statements of Operations.

Talen Montana Pension Plan

The Talen Montana defined benefit pension plan was frozen as of April 30, 2026, and participants ceased accruing additional benefits.

- Definition

The entire disclosure for retirement benefits.

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+ Details

Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2026

Supplemental Cash Flow Elements [Abstract]

Schedule of Supplemental Consolidated Statements of Cash Flows

Supplemental information for the Consolidated Statements of Cash Flows for the periods was:


	Three Months Ended March 31,
	2026		2025
Cash paid (received) during the period
Interest and other finance charges, net of capitalized interest (a)	$	52	$	23
Income taxes, net	(4)		19

Unrealized (gain) loss on derivative instruments included on the Statements of Cash Flows
Commodity contracts	$	154	$	182
Interest rate swap contracts (interest expense)	(2)		14
Unrealized (gain) loss on derivative instruments	$	152	$	196

Depreciation, amortization and accretion included on the Statements of Cash Flows
Depreciation, amortization and accretion	$	92	$	74
Amortization of acquired fuel supply contract liabilities	(29)		—

Other	3		(2)
Depreciation, amortization and accretion	$	66	$	72

Reconciliation of other non-cash operating activities
Derivative option premium amortization	$	5	$	31













Other	(1)		(5)
Total	$	4	$	26

Non-cash investing activities
Accrued PP&E additions not paid at period end	$	15	$	12

__________________

(a)Capitalized interest was non-material for the three months ended March 31, 2026 and 2025



	March 31, 2026		December 31, 2025
Cash and cash equivalents	$	1,025	$	689
Restricted cash and cash equivalents (a)	2		63
Total	$	1,027	$	752

__________________

(a)Comprised of commodity exchange margin deposits.

Nuclear Decommissioning Trust Funds - Schedule of Available-for-Sale Debt Securities With Unrealized Losses (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Fair Value	$ 530
Unrealized Losses	(9)
Aggregate fair value of debt securities in a loss position for a duration of one year or longer	132
Corporate debt securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Fair Value	198
Unrealized Losses	(4)
Municipal debt securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Fair Value	61
Unrealized Losses	(1)
U.S. Government debt securities
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Fair Value	271
Unrealized Losses	$ (4)

Fair Value - Schedule of Carrying Value and Fair Value of Indebtedness (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Carrying Value
Long-term debt	$ 6,807	$ 6,811
Fair Value
Long-term debt	$ 6,970	$ 7,069

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

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-Section S99
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+ Details

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

+ Details

Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator: (Millions of Dollars)
Net Income (Loss)	$ 63	$ (135)
Denominator: (Thousands)
Weighted-Average Number of Common Shares Outstanding - Basic (in shares)	45,612	45,849
Weighted-Average Number of Common Shares Outstanding - Diluted (in shares)	47,431	45,849
Earnings per Share - Basic (in dollars per share)	$ 1.38	$ (2.94)
Earnings per Share - Diluted (in dollars per share)	$ 1.33	$ (2.94)
Restricted stock units
Denominator: (Thousands)
Stock units (in shares)	186	0
Performance stock units
Denominator: (Thousands)
Stock units (in shares)	1,633	0

Risk Management, Derivative Instruments and Hedging Activities - Effect of Netting (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Assets, Gross Derivative Instruments	$ 610	$ 456
Assets, Eligible for Offset	(552)	(396)
Assets, Net Derivative Instruments	58	60
Assets, Collateral (Posted) Received	(15)	0
Assets, Net Amounts	43	60
Liabilities, Gross Derivative Instruments	917	608
Liabilities, Eligible for Offset	(552)	(396)
Liabilities, Net Derivative Instruments	365	212
Liabilities, Collateral (Posted) Received	(66)	(44)
Liabilities, Net Amounts	$ 299	$ 168

Asset Retirement Obligations and Accrued Environmental Costs - Schedule of Changes in Asset Retirement Obligations (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 514
Obligations settled	(6)
Accretion expense	14
Ending balance	$ 522

Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)			7,083,461
Cash settlement, percentage	60.00%
Stock-based compensation liabilities	$ 477	$ 501
Share price (in dollars per share)	$ 319.23
Performance stock units \| Cliff Vesting Schedule \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Performance stock units \| Cliff Vesting Schedule \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted stock units \| Cliff Vesting Schedule
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Restricted stock units \| Ratable Vesting Schedule \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Restricted stock units \| Ratable Vesting Schedule \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Segments - Schedule of Adjusted EBITDA and Reconciling Items (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reconciling Items:
Interest expense and other finance charges	$ (119)	$ (74)
Depreciation, amortization and accretion	(63)	(70)
Nuclear fuel amortization	(24)	(26)
Unrealized gain (loss) on commodity derivative contracts	(154)	(182)
Nuclear decommissioning trust funds gain (loss), net	(22)	(12)
Stock-based and other long-term incentive compensation expense	(2)	(13)
Acquisition and divestiture activities	(1)	(7)
Operational and other restructuring activities	(9)	(2)
Other items	2	(1)
Income (loss) before income taxes	81	(187)
Operating Segments \| PJM
Segment Adjusted EBITDA:
Adjusted EBITDA	479	209
Reconciling Items:
Interest expense and other finance charges	0	0
Operating Segments \| Other
Segment Adjusted EBITDA:
Adjusted EBITDA	9	9
Reconciling Items:
Interest expense and other finance charges	0	0
Corporate and Eliminations
Segment Adjusted EBITDA:
Adjusted EBITDA	(15)	(18)
Reconciling Items:
Interest expense and other finance charges	$ (119)	$ (74)

Postretirement Benefit Obligations (Tables)

3 Months Ended

Mar. 31, 2026

Postemployment Benefits [Abstract]

Schedule of Net Periodic Benefit Costs

The components of net periodic benefit costs for the periods were:


	Three Months Ended March 31,
		2026		2025
Postretirement benefits service cost (a)		$	1	$	1

Postretirement benefit (gain) loss
Interest cost		$	16	$	17
Expected return on plan assets		(19)		(19)

Amortization of:
Postretirement prior service cost (credit)		(1)		(1)

Postretirement benefit (gain) loss, net (b)		$	(4)	$	(3)

Net periodic defined benefit cost (credit)		$	(3)	$	(2)

_____________

(a)Activity presented as “Operation, maintenance and development” on the Consolidated Statements of Operations.

(b)Activity presented as “Other non-operating income (expense), net” on the Consolidated Statements of Operations.

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2026	May 05, 2026
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-37388
Entity Registrant Name	Talen Energy Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-1197305
Entity Address, Address Line One	2929 Allen Pkwy, Suite 2200
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77019
City Area Code	888
Local Phone Number	211-6011
Title of 12(b) Security	Common stock, par value $0.001 per share
Trading Symbol	TLN
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		45,395,007
Entity Central Key Index	0001622536
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Amendment Flag	false

Revenue - Schedule of Future Performance Obligations (Details) - Capacity revenues $ in Millions	Mar. 31, 2026 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future performance obligations	$ 762
Remaining performance obligation period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future performance obligations	$ 1,060
Remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future performance obligations	$ 443
Remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future performance obligations	$ 0
Remaining performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Future performance obligations	$ 0
Remaining performance obligation period	1 year

Revenue - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Revenue from Contract with Customer [Abstract]
Customer accounts receivable	$ 109	$ 160
Other accounts receivable	49	36
Accounts receivable	$ 158	$ 196

Revenue (Tables)

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Components of Operating Revenues

The components of operating revenues for the periods were:


	Three Months Ended March 31,
		2026		2025
Electricity sales and ancillary services, ISO/RTO		$	1,336	$	582
Capacity revenues		207		49
Physical electricity sales, bilateral contracts, other		25		23

Total revenue from contracts with customers		1,568		654
Realized and unrealized gain (loss) on derivative instruments		(439)		(268)

Other revenue		—		4
Operating revenues		$	1,129	$	390

Schedule of Accounts Receivable

“Accounts receivable” presented on the Consolidated Balance Sheets were:


	March 31, 2026		December 31, 2025
Customer accounts receivable	$	109	$	160
Other accounts receivable	49		36
Accounts receivable	$	158	$	196

Schedule of Future Performance Obligations

As of March 31, 2026, future performance obligations that were unsatisfied or partially unsatisfied were:


	2026 (a)		2027		2028 (b)		2029 (b)		2030 (b)
Future performance obligations	$	762	$	1,060	$	443	$	—	$	—

__________________

(a)Estimated for the period from April 1 through December 31, 2026.

(b)As PJM BRAs have not yet occurred for periods after the 2027/2028 PJM Capacity Year, there are no future performance obligations after May 31, 2028.

Risk Management, Derivative Instruments and Hedging Activities - Schedule of Net Notional Volumes of Open Commodity Derivatives and Interest Rate Derivatives (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) MWh MMBTU T	Dec. 31, 2025 USD ($) MWh MMBTU T
Commodity derivatives \| Short
Derivative [Line Items]
Commodity purchase (sales) derivatives, power and natural gas \| MWh	66,143,342	59,634,723
Commodity derivatives \| Long
Derivative [Line Items]
Commodity purchase (sales) derivatives, power and natural gas \| MMBTU	189,897,762	169,209,022
Commodity purchase (sales) derivatives, emission allowances \| T	0	0
Interest rate derivatives
Derivative [Line Items]
Interest rate (in millions) \| $	$ 990	$ 990

Long-Term Debt and Other Credit Facilities

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Long-Term Debt and Other Credit Facilities

10. Long-Term Debt and Other Credit Facilities

TES is the borrower/issuer under all the Company’s debt and credit facilities. As of March 31, 2026, TES was not in default under any of its debt or credit agreements.

Long-Term Debt



	Interest Rate (a)	March 31, 2026		December 31, 2025
TLB-1	6.15 %	$	846	$	848
TLB-2	6.15 %	839		842

TLB-3	5.67 %	1,197		1,200
Secured Notes	8.63 %	1,200		1,200
2034 Unsecured Notes	6.25 %	1,400		1,400
2036 Unsecured Notes	6.50 %	1,290		1,290
PEDFA 2009B Bonds	5.25 %	50		50
PEDFA 2009C Bonds	5.25 %	81		81

Total principal		6,903		6,911
Unamortized deferred financing costs and original issuance discounts		(96)		(100)
Total carrying value		6,807		6,811
Less: long-term debt, due within one year		29		29
Long-term debt		$	6,778	$	6,782

__________________

(a)Computed interest rate as of March 31, 2026.

Revolving Credit and Other Facilities



		March 31, 2026								December 31, 2025
	Maturity	Committed Capacity (a)		Direct Cash Borrowings		LCs Issued		Unused Capacity		Direct Cash Borrowings		LCs Issued		Unused Capacity
RCF	December 2029	$	900	$	—	$	—	$	900	$	—	$	—	$	900
LCF	December 2027	1,100		—		445		655		—		448		652
Total		$	2,000	$	—	$	445	$	1,555	$	—	$	448	$	1,552

__________________

(a)RCF committed capacity can be used for direct cash borrowings and (or) LCs. Direct cash borrowings are not permitted under the LCF, which can only be used for LCs.

Financing Transactions

Unsecured Notes due 2031 and 2033. In April 2026, TES issued in private placement transactions not involving a public offering, and each at par: (i) $1.5 billion in aggregate principal amount of 6.125% Senior Unsecured Notes due 2031, with interest payable on May 1 and November 1 of each year, and (ii) $2.5 billion in aggregate principal amount of 6.375% Senior Unsecured Notes due 2033, with interest payable on May 1 and November 1 of each year. We intend to use the net proceeds from the issuance and sale of the Unsecured Notes due 2031 and 2033 to fund the cash portion of the Cornerstone Acquisition and we have used a portion of the net proceeds to redeem the Company’s outstanding Secured Notes.

The Unsecured Notes due 2031 and 2033 are subject to customary negative covenants, including but not limited to, certain limitations on incurrence of liens and transactions involving the Susquehanna assets, but do not contain any financial covenants. The Unsecured Notes due 2031 and 2033 also contain customary affirmative covenants, events of default, and remedies (including acceleration) and are subject to mandatory redemption provisions in the event that the Cornerstone Acquisition is not completed pursuant to the note purchase agreement. In the event that the Cornerstone Acquisition has not been consummated by January 15, 2027 (or, to the extent such date is automatically extended pursuant to the terms of the Cornerstone Merger Agreement, July 15, 2027), $1.05 billion in aggregate principal amount of the Unsecured Notes due 2031 and $1.75 billion in aggregate principal amount of the Unsecured Notes due 2033 will be redeemed, in each case, at a price equal to 100% of the issue price, plus accrued and unpaid interest.

Secured Notes. In April 2026, TES redeemed in full, the Company’s outstanding Secured Notes in aggregate principal amount of $1.2 billion, using a portion of the net proceeds of the Unsecured Notes due 2031 and 2033. In connection with the redemption, approximately $60 million of expenses are expected to be incurred, primarily consisting of a make-whole payment and derecognition of capitalized deferred finance costs.

Credit Facility Transactions. Also in April 2026, TES undertook the following financing transactions that are expected to become effective concurrently with the closing of the Cornerstone Acquisition: (i) received commitments to increase its existing RCF (including its revolving LC capacity) from $900 million to $1.35 billion; and (ii) received commitments to upsize its existing $1.1 billion LCF to $1.5 billion and extend the maturity from December 2027 to December 2029.

See Note 17 for additional information on the financing transactions and the Cornerstone Acquisition.

Other Material Terms; Security Interests

See Note 13 to the Annual Financial Statements for a description of the other material terms of the obligations outlined above and for additional information on the security interests and guarantees supporting these obligations. In addition to the obligations outlined under “Long-Term Debt” and “Revolving Credit and Other Facilities” above, secured obligations included approximately $343 million under Secured ISDAs as of March 31, 2026.

Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Schedule of Share Repurchase Program

Summary of activity under the SRP:



	Three Months Ended March 31, 2026		Three Months Ended March 31, 2025
		Number of Shares	Share Price (a)		Total Amount		Number of Shares	Share Price (a)		Total Amount
Share repurchases		300,000	$	336.42	$	101	452,130	$	186.24	$	85
Share retirements		(300,000)	336.42		(101)		(452,130)	186.24		(85)

__________________

(a)Weighted average price per share, including transaction costs and excise taxes.

Schedule of Accumulated Other Comprehensive Income

Changes in AOCI for the periods were:


	Three Months Ended March 31,
	2026		2025
Beginning balance	$	(4)	$	(12)
Gains (losses) arising during the period	(9)		6
Reclassifications to Consolidated Statements of Operations	(2)		(2)
Income tax benefit (expense)	4		(2)
Other comprehensive income (loss)	(7)		2

Accumulated other comprehensive income (loss)	$	(11)	$	(10)

The components of AOCI, net of tax, as of March 31, were:


	Three Months Ended March 31,
	2026		2025
Available-for-sale securities unrealized gain (loss), net	$	(4)	$	—

Postretirement benefit prior service credits (costs), net	11		13
Postretirement benefit actuarial gain (loss), net	(18)		(23)
Accumulated other comprehensive income (loss)	$	(11)	$	(10)

Acquisitions and Divestitures	3 Months Ended
Acquisitions and Divestitures	Mar. 31, 2026
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Acquisitions and Divestitures	17. Acquisitions and Divestitures 2026 Pending Acquisition Cornerstone Acquisition. In January 2026, the Company entered into the Cornerstone Merger Agreement with affiliates of Energy Capital Partners to purchase (i) the Lawrenceburg Power Plant, a 1,120 MW natural gas fired combined cycle generation located in Lawrenceburg, Indiana, (ii) the Waterford Energy Center, a 875 MW natural gas fired combined cycle generation plant located in Waterford Township, Ohio; and (iii) the Darby Generating Station, a 456 MW natural gas combustion turbine plant located in Mount Sterling, Ohio, for a price of $3.45 billion, consisting of $2.55 billion in cash, subject to working capital and other customary adjustments, and 2,400,000 shares of TEC common stock, valued at approximately $900 million at the time of entry into the Cornerstone Merger Agreement. The final value of the equity portion of the transaction price will be based on the value of Talen common stock at the close of the transaction. The cash portion of the purchase price will be funded from the proceeds of the Unsecured Notes due 2031 and 2033 which were issued in April 2026. The Cornerstone Acquisition will substantially expand Talen’s presence in the western PJM market and add additional efficient baseload generation assets to its fleet. The transaction is expected to close early in the second half of 2026 and is subject to the satisfaction of customary closing conditions and regulatory approvals from the FERC, Indiana Utility Regulatory Commission and other regulatory agencies. The waiting period pursuant to the Hart-Scott-Rodino Act of 1976 expired in March 2026.

Earnings Per Share - Narrative (Details) - shares	3 Months Ended
Earnings Per Share - Narrative (Details) - shares	Mar. 31, 2026	Mar. 31, 2025
Performance Shares, Target Not Met
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares (in shares)	145,911
Performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares (in shares)	3,142	2,109,479
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares (in shares)	1,610	486,688

Long-Term Debt and Other Credit Facilities - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total principal	$ 6,903	$ 6,911
Unamortized deferred financing costs and original issuance discounts	(96)	(100)
Total carrying value	6,807	6,811
Less: long-term debt, due within one year	29	29
Long-term debt	$ 6,778	6,782
Secured Notes
Debt Instrument [Line Items]
Interest rate	8.63%
Total principal	$ 1,200	1,200
TLB-1 \| Secured Debt
Debt Instrument [Line Items]
Interest rate	6.15%
Total principal	$ 846	848
TLB-2 \| Secured Debt
Debt Instrument [Line Items]
Interest rate	6.15%
Total principal	$ 839	842
TLB-3 \| Secured Debt
Debt Instrument [Line Items]
Interest rate	5.67%
Total principal	$ 1,197	1,200
2034 Unsecured Notes \| Unsecured Notes
Debt Instrument [Line Items]
Interest rate	6.25%
Total principal	$ 1,400	1,400
2036 Unsecured Notes \| Unsecured Notes
Debt Instrument [Line Items]
Interest rate	6.50%
Total principal	$ 1,290	1,290
PEDFA 2009B Bonds \| Bonds
Debt Instrument [Line Items]
Interest rate	5.25%
Total principal	$ 50	50
PEDFA 2009C Bonds \| Bonds
Debt Instrument [Line Items]
Interest rate	5.25%
Total principal	$ 81	$ 81

Commitments and Contingencies - Environmental Matters (Details)	1 Months Ended
	Nov. 30, 2024 group	May 31, 2024 state
Environmental Matters, EPA MATS Rule
Other Commitments [Line Items]
Number of states where challenges have been filed		23
Environmental Matters, EPA GHG Rule
Other Commitments [Line Items]
Number of states represented by coalitions		27
Environmental Matters, Effluent Limitation Guidelines
Other Commitments [Line Items]
Number of states where challenges have been filed		15
Environmental Matters, EPA CCR Rule
Other Commitments [Line Items]
Number of groups that challenged the EPA CCR Rule \| group	2

Nuclear Decommissioning Trust Funds - Schedule of Unrealized Gain (Loss) on Nuclear Decommissioning Trust Funds (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Cash equivalents, Amortized Cost	$ 1,025	$ 689
Cash equivalents, Fair Value	16	16
Fair value of equity	388	385
Equity securities, Unrealized Gains	706	739
Equity securities, Unrealized Losses	(22)	(19)
Equity securities, Fair Value	1,072	1,105
Debt securities, Amortized Cost	780	773
Debt securities, Unrealized Gains	4	7
Debt securities, Unrealized Losses	(9)	(3)
Debt securities	775	777
Receivables (payables), net, Amortized Cost	6	2
Receivables (payables), net, Fair Value	6	2
Amortized Cost	1,190	1,176
Unrealized Gains	710	746
Unrealized Losses	(31)	(22)
NDT funds	1,869	1,900
Cash equivalents
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Cash equivalents, Amortized Cost	16	16
Cash equivalents, Fair Value	$ 16	$ 16

Condensed Consolidated Statements Of Operations (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Stock-based compensation expense (benefit), net, equity-classified awards	$ 1	$ (11)

Asset Retirement Obligations and Accrued Environmental Costs

3 Months Ended

Mar. 31, 2026

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations and Accrued Environmental Costs

8. Asset Retirement Obligations and Accrued Environmental Costs

Certain subsidiaries of the Company have legal retirement obligations for the decommissioning and environmental remediation costs associated with our current and former generation sites. Most of these obligations, except remediation of some ash impoundments, are not expected to be paid until several years, or decades, in the future. The Company’s most significant obligations are associated with the: (i) decommissioning of Susquehanna, which the NDT is expected to fund; and (ii) coal ash disposal units of legacy coal-fired generation facilities which, for certain obligations, the Company has posted surety bonds (some of which have been collateralized with LCs). The carrying value of these AROs include assumptions of estimated future retirement and remediation cash expenditures, cost escalation rates, probabilistic cash flow models, and discount rates.

The Company may be required to revise or recognize new AROs as a result of regulatory changes by the NRC, EPA, Montana Department of Environmental Quality (the “MDEQ”) or other regulatory entities. Additionally, revisions may result from scope of work amendments to remediation activities as well as changes to remediation costs and other assumptions. If the assumptions underlying any ARO estimates do not materialize as expected, actual cash expenditures and costs could be materially different than currently estimated.

As of March 31, 2026, the fair values of certain conditional AROs as a result of the EPA CCR Rule cannot be determined. See Note 9 for additional information on a recent EPA proposal to rescind certain provisions of the EPA CCR Rule.

The carrying value of AROs and accrued environmental costs were:



	March 31, 2026		December 31, 2025
Asset retirement obligations	$	522	$	514
Accrued environmental costs	20		20
Total asset retirement obligations and accrued environmental costs	542		534
Less: asset retirement obligations and accrued environmental costs due within one year (a)	46		40

Asset retirement obligations and accrued environmental costs due after one year	$	496	$	494

__________________

(a)Presented as “Other current liabilities” on the Consolidated Balance Sheets.

The changes of the ARO carrying value during the period were:



	2026
Carrying value January 1,	$	514

Obligations settled	(6)
Accretion expense	14


Carrying value, March 31,	$	522

The disaggregation of ARO carrying values on the Consolidated Balance Sheets was:



	March 31, 2026		December 31, 2025

Nuclear (a)	$	281	$	272
Non-nuclear (b)	241		242
Carrying value	$	522	$	514

__________________

(a)Obligations are expected to be settled with available funds in the NDT at the time of decommissioning. See Note 6 for additional information on the NDT.

(b)Certain obligations are: (i) partially supported by surety bonds, some of which have been collateralized with LCs; or (ii) partially prefunded under phased installment agreements.

Segments (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Consolidated Segment and Reconciliation


	PJM		Other		Corporate and Eliminations		Total
Three Months Ended March 31, 2026
Operating revenues	$	1,110	$	28	$	(9)	$	1,129
Operation, maintenance and development expenses (a)	158		7
Interest expense and other finance charges	—		—		119		119
Other segment items (b)	473
Adjusted EBITDA	479
Capital expenditures	67		2		—		69

Three Months Ended March 31, 2025
Operating revenues	$	367	$	42	$	(19)	$	390
Operation, maintenance and development expenses (a)	138		8
Interest expense and other finance charges	—		—		74		74
Other segment items (b)	20
Adjusted EBITDA	209
Capital expenditures	62		1		1		64

__________________

(a)This significant segment expense category aligns with the segment-level information that is regularly reviewed by the CODM.

(b)Other segment items are primarily comprised of fuel and energy purchases.

Reconciliation of segment Adjusted EBITDA to Income (Loss) Before Income Taxes:


	Three Months Ended March 31,
		2026		2025

PJM Segment Adjusted EBITDA		$	479	$	209


Reconciling Items:
Interest expense and other finance charges		$	(119)	$	(74)
Depreciation, amortization and accretion (a)		(63)		(70)
Nuclear fuel amortization (a)		(24)		(26)

Unrealized gain (loss) on commodity derivative contracts		(154)		(182)
Nuclear decommissioning trust funds gain (loss), net		(22)		(12)
Stock-based and other long-term incentive compensation expense		(2)		(13)





Acquisition and divestiture activities (b)		(1)		(7)


Operational and other restructuring activities (c)		(9)		(2)




"Other" operating segment		9		9

Corporate and Eliminations		(15)		(18)
Other items		2		(1)
Income (Loss) Before Income Taxes		$	81	$	(187)

__________________

(a)Includes the periodic amortization of fair value adjustments associated with acquired fuel supply contract liabilities and intangible assets.

(c)Non-recurring severance and retention costs and strategic initiative costs.

Stockholder's Equity - Schedule of Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Equity [Abstract]
Share repurchases (in shares)	300,000	452,130
Share repurchases (in dollars per share)	$ 336.42	$ 186.24
Share repurchases	$ 101	$ 85
Share retirements (in shares)	(300,000)	(452,130)
Share retirements (in dollars per share)	$ 336.42	$ 186.24
Share retirements	$ (101)	$ (85)

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies Legal, Regulatory, and Environmental Matters We are regularly subject to various legal, regulatory, and environmental matters in connection with our business. While we believe we have meritorious positions and will continue to vigorously defend our positions in these matters, we may not be successful in our efforts, and we cannot predict the effect of an adverse outcome of any such matter. If an unfavorable outcome is probable and can be reasonably estimated, a liability is recognized. In the event of an unfavorable outcome, the liability may be in excess of amounts currently accrued. Because of the inherently unpredictable nature of legal, regulatory, and environmental matters and the wide range of potential outcomes for any such matter, no estimate of the possible losses in excess of amounts accrued, if any, can be made at this time regarding any matter specifically described below. As a result, additional losses actually incurred in excess of amounts accrued could be substantial. Unless otherwise disclosed below, we are unable to predict the outcome of any matter discussed below or reasonably estimate the amount of any associated costs and (or) potential liabilities. Additionally, it is possible that the outcome of any such matter, including market modifications, could materially impact our business, financial condition, results of operations, cash flows, and (or) liquidity. Legal Matters We are involved in various legal and administrative proceedings, investigations, claims, and litigation from time to time in the course of our business. Such matters may include, but are not limited to, those relating to employment and benefits, commercial disputes, personal injury, property damage, regulatory matters, environmental matters, and various other claims for injuries and (or) damages. While we believe we have meritorious positions and will continue to appropriately respond to all legal matters, because of the inherently unpredictable nature of legal proceedings, there is a wide range of potential outcomes for any such matter. Winter Storm Uri Lawsuits. In connection with the sale of Talen’s generating facilities in Texas in May 2024, the Company retained certain potential liabilities relating to claims filed from 2021 onward against its former Texas subsidiaries seeking unspecified damages for alleged losses caused by the defendants’ failure to provide sufficient power to the grid during Winter Storm Uri. The claims also allege similar liability against numerous other power market participants. These cases were transferred to a single multi-district litigation (MDL) court. In January 2023, the MDL court ruled on various motions to dismiss, but denied the motions to dismiss filed by the generator defendants. In December 2023, the Texas First Court of Appeals granted a mandamus petition and instructed the MDL court to grant the motions to dismiss filed by the generator defendants. In early 2025, the plaintiffs filed for mandamus relief in the Texas Supreme Court seeking to overturn the Texas First Court of Appeals. In March 2026, the Texas Supreme Court denied the plaintiffs’ requests. While Talen expects the dismissal ruling to be applied broadly to all Uri cases against Talen’s former subsidiaries, the cases remain pending at this time. If the cases are not dismissed, Talen’s maximum potential damages for claims filed prior to the restructuring are expressly limited by Talen’s plan of reorganization to payments from Talen’s insurers. However, claims filed after the restructuring by plaintiffs who did not receive effective notice of the restructuring, if any, may not be subject to the limitations in the plan. Talen cannot predict the effect of an adverse outcome for any such claims. See Note 9 to the Annual Financial Statements for certain other active legal matters. Regulatory Matters We are subject to regulation by federal and state agencies and other bodies that exercise regulatory authority in the various regions where we conduct business, including but not limited to the FERC; the DOE; the NRC; the North American Energy Reliability Corporation (“NERC”); the Federal Communications Commission; and state public utility commissions. In addition, the RTOs and ISOs in the regions in which we conduct business inherently have complex rules that are intended to balance the interests of market stakeholders. Proposed market structure modifications may lead to disputes among stakeholders that might not be resolved for a period of time as a result of regulatory and (or) legal proceedings. Accordingly, we are subject to uncertainty with respect to: (i) new or amended regulations issued by regulatory agencies; and (ii) changes in market design, tariff structure, capacity auctions, and (or) pricing rules. PJM Capacity Market Reform. In June 2023, the FERC accepted a request by PJM to delay certain PJM Base Residual Auctions in order for PJM to propose market reforms. PJM filed its market reform proposals with the FERC in October 2023. In early 2024, the FERC accepted portions of PJM’s proposed market changes and PJM scheduled certain PJM BRAs on a delayed basis. In September 2024, the Sierra Club and other organizations filed a complaint at the FERC challenging PJM’s rules establishing must-offer exceptions for PJM BRA participation by RMR resources. In October 2024, PJM announced it had concerns about the FERC considering the Sierra Club’s complaints about RMR resources in isolation and therefore intended to file a Section 205 proceeding under the Federal Power Act seeking the FERC’s approval of to-be-determined market reforms, including but not limited to potential revisions to the treatment of RMR resources. As a result, in October 2024, PJM formally requested, which the FERC approved, six-month delays to the scheduled PJM BRAs for the 2028/2029, and 2029/2030 PJM Capacity Years to June 2026, and December 2026, respectively. Currently, the auction for the 2030/2031 PJM Capacity Year in May 2027 is scheduled on a non-delayed basis. Talen can provide no assurance that these or any scheduled PJM BRAs will be held on such dates or at all. A series of filings aimed at reforming the PJM capacity market were filed at the FERC. In November 2024, the Joint Consumer Advocates, comprised of consumer advocacy groups and government entities from Illinois, Maryland, New Jersey, Ohio, and the District of Columbia filed a complaint against PJM asking the FERC to find that PJM’s existing capacity market rules are unjust and unreasonable and to issue an order requiring certain short-term and longer-term changes to PJM’s capacity market rules. In response, PJM made two FERC filings in December 2024 to address what they perceive as capacity market design issues (the “PJM Capacity Market 205 Proceeding”). PJM proposed to retain the dual fuel combustion turbine as the reference resource and to implement a uniform non-performance charge throughout the RTO for the 2026/2027 and 2027/2028 PJM Capacity Years, and to administratively include RMR units that meet certain criteria as price takers in the capacity auctions for the next two delivery years and will not assess penalties or pay bonuses to these RMR units. PJM’s filing also clarifies that being excused from being required to offer into the capacity market is no defense to exercising market power by electing not to offer. Further, PJM proposed to make changes to the capacity market mitigation rules. This proposal will eliminate the must-offer exception for intermittent and limited duration resources that are eligible to participate in the capacity market and will allow market sellers to incorporate a risk component in their capacity market offers. In February 2025, the FERC accepted PJM’s proposals in the PJM Capacity Market 205 Proceeding and as a result, the changes to the PJM BRA parameters described above as part of that proceeding were adopted for the 2026/2027 and 2027/2028 PJM Capacity Years. In December 2024, the Pennsylvania Governor filed a complaint against PJM at the FERC to address alleged elevated costs to consumers from the PJM capacity market in the 2026/2027 and 2027/2028 PJM Capacity Years and proposed, among other things, a lower capacity price cap. As a result of a subsequent agreement between the Commonwealth of Pennsylvania and PJM that resolved the Governor’s complaint, the Governor withdrew the complaint in February 2025. In April 2025, the FERC accepted PJM’s proposals reflecting its agreement with the Commonwealth of Pennsylvania. As a result, the PJM BRA imposed a price collar with an approximate minimum and maximum price of $175/MWd and $325/MWd, respectively, which was effective for the 2026/2027 and 2027/2028 PJM BRAs. In April 2026, the FERC approved the extension of the same price collar framework for the 2028/2029 and 2029/2030 PJM Capacity Years. In February 2025, the FERC initiated a technical conference docket to consider broad resource adequacy issues across all RTOs, with the initial proceedings taking place in June 2025. The Company has intervened in the new technical conference docket and is closely monitoring those proceedings. Brandon Shores and H.A. Wagner RMR Agreements. In May 2025, the FERC approved each of the Brandon Shores and H.A. Wagner RMR agreements, under which: (i) Talen will operate the generation facilities in accordance with such arrangements from June 1, 2025 through May 31, 2029, or until such time as the necessary third-party transmission upgrades are placed into service; (ii) Brandon Shores will earn annual fixed-cost payments of $145 million ($312/MWd), inclusive of a $5 million per year unit performance “hold back;” (iii) H.A. Wagner will earn annual fixed-cost payments of $35 million ($137/MWd), inclusive of a $2.5 million per year unit performance “hold back;” and (iv) each facility will receive separate reimbursement for variable costs and approved project investments. In August 2025, the Maryland Office of People’s Counsel filed an appeal of the FERC’s order approving the Brandon Shores and H.A. Wagner RMR agreements. Talen has intervened in that proceeding and plans to participate. Interconnection of Large Loads. In October 2025, DOE directed the FERC to consider reforms to expedite and facilitate how large loads interconnect to the interstate transmission system. DOE stated that the Federal Power Act permits the FERC to exert jurisdiction over load interconnections even though it has not historically done so. DOE provided a draft advance notice of proposed rulemaking (“ANOPR”) and directed the FERC to initiate rulemaking procedures. In November 2025, the FERC requested public comment on the ANOPR, and the Company provided comments. DOE directed the FERC to take final action by the end of April 2026. In August 2025, PJM began an accelerated process known as a Critical Issue Fast Path (“CIFP”) process with stakeholders to address how to integrate large load customers quickly and reliably. The CIFP stakeholders represented a wide range of views about resource allocations, costs, and how the addition of large loads like data centers to PJM should be managed in the context of the capacity market. The Company was an active participant in the CIFP process and submitted a joint proposal amongst itself, Constellation, Calpine, Amazon, Microsoft, and Google representing the group’s collective views on the best approach to large load additions. Neither the joint proposal nor any of the other proposals submitted received broad stakeholder support during voting. Nevertheless, PJM had planned to make a filing at the FERC in January 2026 containing PJM’s ultimate proposal to be in place for the 2028/2029 PJM BRA. In December 2025, however, the FERC issued an order in a show cause proceeding on large loads co-located with generation. The FERC directed PJM to submit an informational report containing, among other items, all of the CIFP proposals. The FERC also found that the PJM tariff was unjust and unreasonable as to the interconnection of co-located loads. The FERC requested tariff revisions be submitted over the next 30-60 days and established a hearing schedule, which begins in February 2026, to establish rates, terms, and conditions of several new transmission services. In January 2026, the National Energy Dominance Council (“NEDC”) and the Governors from each of the 13 states in PJM issued a “Statement of Principles” for PJM. Among other things, the statement calls for PJM to conduct a reliability backstop auction for new baseload capacity with 15-year contracts by September 2026. It also urged PJM to extend the existing price collar for the next two BRAs. Hours after the NEDC/Governors’ principles were released, the PJM Board of Managers issued a Board Decisional Letter — the final step in the Large Load Addition CIFP process. The Board’s Decisional Letter adopted specific elements of various proposals, including load forecasting improvements, voluntary bring your own generation paired with an expedited interconnection track, a holistic review in the coming year of investment incentives in PJM’s markets, and immediate initiation of a reliability backstop procurement. PJM Reliability Backstop Procurement. In February 2026, PJM launched a series of workshops to develop a proposal for a reliability backstop procurement, a one-time, transitional procurement of capacity to begin to address the expected future load growth in the PJM region. As with the CIFP process, the Company is actively participating and presented a joint proposal with a cross-sector coalition. In April 2026, PJM staff presented its proposal for a two-phase reliability backstop procurement. The first phase, which would run from September 2026 to March 2027, entails PJM acting as a “matchmaker” for bilateral contracts; the second phase, which would not commence until March 2027, is a centralized procurement. Additional workshops to receive feedback on the proposal and receive alternative proposals are scheduled in May. PJM anticipates it will make a filing at FERC in June 2026. Environmental Matters Extensive federal, state, and local environmental laws and regulations are applicable to our business, including those related to air emissions, water discharges, hazardous substances, and solid waste management. From time to time, in the ordinary course of our business, Talen may be: (i) subject to environmental remediation work at its facilities; (ii) involved in other environmental matters; or (iii) become subject to other, new or revised environmental statutes, regulations, or requirements. It may be necessary for us to modify, curtail, replace, or cease operation of certain facilities or performance of certain operations to comply with statutes, regulations, and other requirements imposed by regulatory bodies, courts, or environmental groups. We may incur significant costs to comply with these requirements, including increased capital expenditures or operation and maintenance expenses, monetary fines, remediation costs, penalties, or other restrictions. Legal challenges to environmental rules or permits add to the uncertainty of estimating future compliance costs. In addition, in January 2025, President Trump issued executive orders directing the heads of all federal agencies to identify and begin the processes to suspend, revise, or rescind all agency actions, including existing regulations, that are unduly burdensome on the identification, development, or use of domestic energy resources. Consequently, in March 2025, the EPA announced that it will reconsider and potentially roll back 31 regulations and policies, many of which directly impact Talen, and various executive actions were taken in April 2025 to further encourage deregulation. The EPA’s reconsiderations for many of these regulations and policies remain ongoing, and certain executive orders have subsequently been challenged by states and individual plaintiffs. Future provisions, implementation, and enforcement of these executive actions and the environmental rules continue to be uncertain. Further, costs may increase significantly if the requirements or scope of environmental laws or regulations, or similar rules, are expanded or changed in other ways. EPA CSAPR and Nitrogen Oxides (“NOx”) Requirements. Coal-fired generation facilities, including those in which Talen has ownership, have been the subject of EPA regulations and efforts by certain states and other parties to strengthen applicable NOx emission limits under the Clean Air Act. In 2015, the EPA revised the 8-hour ozone National Ambient Air Quality Standards for ground-level ozone to 70 parts per billion (the “EPA 2015 Ozone Standard”). This action triggered updates to state-specific compliance requirements as well as provisions that are intended to limit cross-state emissions. In June 2023, the EPA published a rule in connection with the EPA 2015 Ozone Standard updating the EPA CSAPR ozone season NOx allowance trading program for 2023 and beyond (the “Good Neighbor Plan”). Talen’s facilities in Maryland and Pennsylvania were subject to the new rule; however, the entire rule was challenged by multiple parties, and subsequently the Good Neighbor Plan was stayed in its entirety by the U.S. Supreme Court in June 2024 pending a complete review of the rule by the D.C. Circuit Court of Appeals. In November 2024, the EPA issued an interim final rule indicating it plans to provide NOx allocations and budgets from the previously applicable and less restrictive Revised CSAPR Update Rule until the Good Neighbor Plan matter is resolved. After initially denying the EPA’s request in February 2025, the D.C. Circuit Court of Appeals in April 2025, granted the EPA’s motion requesting the Good Neighbor Plan litigation be held in abeyance pending the EPA’s review of the stayed rule and further orders by the court. As a result, future implementation and enforcement of the Good Neighbor Plan has continued to be uncertain. In January 2026, the EPA proposed Phase 1 of its reconsideration of the Good Neighbor Plan. In its proposal, the EPA proposes to approve state implementation plan submissions governing interstate emissions from eight states (Alabama, Arizona, Kentucky, Minnesota, Mississippi, Nevada, New Mexico, and Tennessee). If finalized, these states would no longer be subject to Good Neighbor Plan requirements. Although Talen does not operate in any of the states identified in the proposed rule, EPA in its proposal states that it intends to undertake a separate action to address interstate transport obligations for the remaining states covered under the Good Neighbor Plan. EPA MATS Rule. In May 2024, the EPA published a rule that requires coal-fired generation facilities to reduce particulate matter emissions by the middle of 2027 (or 2028, if an extension is approved) (the “2024 EPA MATS Rule”). Challenges to the 2024 EPA MATS Rule were filed in the D.C. Circuit Court of Appeals, including by Talen and 23 states. The appeal on the merits of the 2024 rule remains pending in the D.C. Circuit Court of Appeals, but the litigation has been held in abeyance since February 2025, while the EPA reconsidered the rule. In February 2026, the EPA completed its reconsideration and issued a final rule repealing the lower particulate matter standards set in the 2024 amendments and reverting to particulate matter standards promulgated in the 2012 EPA MATS Rule (the “MATS Repeal Rule”). In March 2026, environmental groups challenged the MATS Repeal Rule in the D.C. Circuit Court of Appeals. Talen filed a motion to intervene in the MATS Repeal Rule litigation in April 2026. The D.C. Circuit Court of Appeals issued an order holding the challenge to the 2024 EPA MATS Rule in abeyance until the litigation over EPA’s MATS Repeal Rule is fully resolved. No assurance can be provided as to whether the MATS Repeal Rule will survive judicial challenge and when such challenges will be resolved. Colstrip was not expected to meet the 2024 particulate matter standard without substantial upgrades to its control equipment. As a result, if the MATS Repeal Rule is vacated by a court or reconsidered by the EPA in the future, Talen Montana and the other Colstrip co-owners may face the decision either to invest in new cost-prohibitive control equipment or retire the Colstrip facility. Such a decision must be evaluated in conjunction with other compliance requirements. In April 2025, President Trump granted Colstrip a two-year exemption from compliance obligations of the 2024 EPA MATS Rule via Section 112(i)(4) of the Clean Air Act. Environmental groups filed separate lawsuits in the D.C. Circuit Court of Appeals and the U.S. District Court for D.C., challenging the presidential exemptions issued to Colstrip and other fossil fuel-fired power plants. On August 5, 2025, the EPA filed a motion in each case requesting the courts hold the litigation in abeyance for six months pending the EPA’s efforts to repeal the 2024 EPA MATS Rule. Talen filed motions to intervene in both cases on August 8, 2025. On September 3, 2025, the U.S. District Court for D.C. granted the EPA’s motion to hold the case in abeyance for six months and also granted Talen’s motion to intervene. Plaintiffs filed a motion asking the court to reconsider its decision to hold the case in abeyance. The U.S. District Court for D.C. denied that motion in November 2025. The D.C. Circuit Court of Appeals granted the EPA’s motion for an abeyance and Talen’s motion to intervene in October 2025. In March 2026, the U.S. District Court for D.C. granted plaintiffs’ motion to hold the case in abeyance until the litigation over EPA’s MATS Repeal Rule is fully resolved. It is expected that a similar motion will be filed in the D.C. Circuit. The Company could be forced to make operating decisions about the future of Colstrip before clarity is obtained on legal challenges regarding the MATS Repeal Rule and the presidential exemption litigation. EPA GHG Rule. In May 2024, the EPA published a rule that establishes carbon dioxide limits for new electric generating units (“EGUs”) and greenhouse gas (“GHG”) guidelines for certain existing EGUs. Under the guidelines, if existing coal-fired EGUs operate beyond 2031, GHG reductions, such as those achieved by the addition of carbon capture and sequestration (“CCS”), are required to be implemented by the end of 2031. Colstrip is not expected to meet the new rules without substantial technology upgrades and pipeline infrastructure build-out. As a result, Talen Montana and the other Colstrip co-owners face the decision either to invest in new cost-prohibitive controls (e.g., CCS technology) or retire the Colstrip facility by the end of 2031. Such a decision must be evaluated in conjunction with compliance requirements under the May 2024 EPA MATS Rule. Petitions have been filed in the D.C. Circuit Court of Appeals, including by coalitions representing 27 states and an ad hoc coalition of power producers of which Talen is a member, requesting a review of the EPA GHG Rule. Stay motions were denied by the D.C. Circuit Court of Appeals in July 2024 and the U.S. Supreme Court in October 2024. Appeals of the EPA GHG Rule remain pending in the D.C. Circuit Court of Appeals. The D.C. Circuit Court of Appeals has held the litigation in abeyance since February 2025 to allow the EPA to reconsider the rule. No assurance can be provided as to when the challenges to the EPA GHG Rule will be resolved or whether such challenges will be resolved in the Company’s favor. In June 2025, the EPA released a proposed rule to repeal all GHG emission standards for fossil fuel-fired power plants. As an alternative, the EPA is proposing a narrow repeal of GHG standards, which would eliminate all emissions guidelines and standards for existing power plants and the Phase 2 GHG emissions standards that would apply to new combustion turbines beginning in 2032. Under the alternative proposal, Phase 1 GHG emissions standards applicable to new and reconstructed baseload fossil fuel-fired stationary combustion turbines would be retained. The public comment period on the proposal expired in August 2025. No assurance can be provided as to whether the rule will be finalized and whether a final rule will survive judicial challenge. The EPA has also in the past stated its intent to develop GHG regulations for existing natural gas combustion turbines; however, no rule has been proposed, and no recent statements have been made. Operating decisions about the future of Colstrip are highly dependent on the fate of the EPA GHG Rule as well as the EPA MATS Rule. Given the legal and regulatory uncertainties with both rules, it is possible the Company will be required to make decisions about Colstrip’s future before it has clarity about the outcome of litigation and (or) the EPA’s regulations. GHG Endangerment Finding. In February 2026, the EPA issued a final rule rescinding its 2009 finding that GHG emissions endanger public health and welfare and repealing all GHG emissions standards for light-, medium-, and heavy-duty vehicles and engines. The EPA made the 2009 endangerment finding in order to promulgate GHG emission standards for new motor vehicles under Section 202(a) of the Clean Air Act and has subsequently relied on this finding as a basis to regulate other sources of GHGs. In the final rule, EPA states it must rescind the endangerment finding because it lacks the statutory authority to regulate GHG emissions from vehicles in response to global climate changes concerns. The EPA does not explicitly state how the rescission impacts its authority to regulate GHG emissions from stationary sources. However, the final rule acknowledges that EPA has relied on the endangerment finding “to extend the GHG regulatory program to new and existing stationary source performance standards and guidelines for power plants under CAA section 111.” Citizen groups, states, municipalities and cities have challenged the final rule in the D.C. Circuit Court of Appeals. No assurance can be provided as to whether the rule will survive judicial challenge. NSPS for Stationary Combustion Turbines. In January 2026, the EPA finalized a rule revising new source performance standards (“NSPS”) for stationary combustion turbines. The final rule establishes NOx emission standards for various combustion turbine sizes, retains existing SO2 standards and establishes design efficiency subcategories and utilization requirements. The final rule applies to combustion turbines that commenced construction, modification, or reconstruction after December 13, 2024. As a result, the rule could impact certain, newer generating assets of the Company or development projects. In March 2026, environmental groups challenged the final rule in the D.C. Circuit Court of Appeals and separately filed with the EPA a petition for administrative reconsideration. Talen is a member of an ad hoc industry coalition that filed a motion to intervene in the case in April 2026. No assurance can be provided as to when the challenges to the final NSPS will be resolved or whether such challenges will be resolved in the Company’s favor. Pennsylvania RGGI. In October 2019, the then-Governor of Pennsylvania signed an executive order directing the Pennsylvania Department of Environmental Protection (the “PADEP”) to draft regulations establishing a cap-and-trade program with the intent of enabling Pennsylvania to join the RGGI, a multi-state regional cap-and-trade program comprised of several Eastern U.S. states. In April 2022, Pennsylvania entered the RGGI program, with compliance set to begin on July 1, 2022. However, in November 2023, the Commonwealth Court of Pennsylvania ruled RGGI was an invalid tax and voided the rulemaking. The PADEP appealed this decision to the Pennsylvania Supreme Court and filed notice with the court that the RGGI program would not be implemented while the appeal is pending. In July 2024, the Pennsylvania Supreme Court permitted certain non-profit environmental groups to intervene in the case. Oral argument in the case took place in May 2025. In November 2025, the Pennsylvania legislature passed a budget that included provisions requiring Pennsylvania to withdraw from RGGI. As a result, the PADEP filed an application to the Pennsylvania Supreme Court requesting to discontinue its appeal. The Pennsylvania Supreme Court granted the application and dismissed the case in January 2026. EPA ELG Rule. In November 2015, the EPA revised the effluent limitation guidelines (“ELGs”) for certain power generation facilities, which imposed more stringent standards for wastewater streams as facility discharge permits are renewed. In 2020, the EPA issued changes that would exempt coal generation facility operators from meeting certain wastewater standards if the facility would commit to cease coal-fired generation by the end of 2028, which Talen elected for its wholly owned coal operations. In May 2024, the EPA published revisions to the EPA ELG Rule, which imposed additional requirements for legacy wastewater and combustion residual leachate. These revisions impact Talen’s active generation facilities that have both CCR units and hold National Pollutant Discharge Elimination System (“NPDES”) discharge permits. These sites include Brandon Shores, Brunner Island, Montour, and potentially Martins Creek. Talen is evaluating what: (i) potential discharge limits may apply; (ii) treatment may be required; and (iii) the implementation timeline may be. Obligations for installing any new wastewater treatment equipment, if necessary, will not be known until each applicable state where the active generation facilities operate makes its own determination with respect to NPDES permit renewals with new limits and associated timing. As a result of the future permit conditions, additional capital expenditures and (or) AROs may be required, which may have a material impact on Talen’s operations and (or) financial condition. Multiple challenges, including stay requests, to the EPA ELG Rule have been filed in various U.S. Courts of Appeal by parties that include 15 states, environmental groups, and industry groups, including the Utility Water Act Group (“UWAG”), of which Talen is a member. The appeals have been consolidated in the U.S. Court of Appeals for the Eighth Circuit, which denied requests to stay the rule in October 2024. At the EPA’s request, the Eighth Circuit has held the consolidated challenges in abeyance since February 2025 to allow the EPA to reconsider the rule. In March 2025, the EPA announced that it will revise the EPA ELG Rule as part of its deregulation agenda while considering immediate relief from some of the existing leachate requirements. In June 2025, the EPA announced that it will issue a proposal in 2025 to extend compliance deadlines under the 2024 EPA ELG Rule and seek information to potentially inform further rulemaking. In September 2025, the EPA issued a direct final rule extending a short-term deadline and a companion proposal extending many compliance deadlines for the 2024 EPA ELG Rule and providing some flexibility relating to some deadlines in the 2020 ELG Rule. In November 2025, the EPA issued a notice withdrawing the direct final rule due to the receipt of adverse comments. The EPA finalized its proposal in December 2025. Among other things, the final rule extends zero-discharge compliance deadlines established in the 2024 EPA ELG Rule by five years from December 31, 2029 to December 31, 2034. The extension rule has been legally challenged by environmental groups. These challenges have been consolidated in the U.S. Court of Appeals for the Second Circuit and UWAG’s motion to intervene in the consolidated litigation was granted in March 2026. In the final rule, the EPA also stated it is considering further rulemaking to revise the regulatory standards in the 2024 EPA ELG Rule. No assurance can be provided as to when the challenges to the EPA ELG Rule merits will be resolved or whether such changes and challenges will be resolved in the Company’s favor. EPA CCR Rule. In April 2015, the EPA established regulations under the RCRA to identify CCRs as nonhazardous solid waste and provided CCR management and siting requirements. The 2015 rule was modified in 2020 after a 2018 D.C. Circuit Court of Appeals ruling found that, among other things, the EPA did not adequately regulate unlined impoundments. In its 2020 rulemaking, the EPA specified procedures for owners to extend the operating timeline of certain unlined impoundments. Talen submitted an extension request under this process for an unlined impoundment at Montour, which was withdrawn in December 2024, following the end of basin operations and the initiation of basin closure. The 2018 D.C. Circuit Court of Appeals ruling also found that the EPA did not properly address legacy surface impoundments in the 2015 CCR rule. As a result of the finding, in May 2024, the EPA finalized additional federal CCR regulations effective in November 2024 (the “Legacy CCR Rule”), which provided new requirements for legacy CCR surface impoundments and new requirements for other CCR disposal and management areas at active power plants (“CCRMUs”). This rule has been challenged in the D.C. Circuit Court of Appeals by multiple parties, including two industry groups of which Talen is a member. In December 2024, the U.S. Supreme Court denied a requested stay of the Legacy CCR Rule. At the EPA’s request, the D.C. Circuit Court of Appeals has held the case in abeyance since February 2025 to allow the EPA to reconsider the rule. Additionally, the EPA is being challenged by other industry parties on new regulatory interpretations that could be consequential to CCR unit closure practices and costs. In March 2025, the EPA announced that it will prioritize the coal ash program by expediting state permit reviews. The EPA has also announced it will reform the EPA CCR Rule and provided in the Legacy CCR Rule litigation proceeding that EPA CCR Rule reforms will be completed in 2026. As an initial reform step, in February 2026, the EPA issued a final rule extending compliance deadlines for elements in the Legacy CCR Rule, including required applicability assessments, the initiation of new groundwater monitoring detection, and the initiation of unit closure. In April 2026, the EPA issued a proposal to amend various provisions in the CCR regulations. Among other things, the EPA proposes to rescind all requirements for CCRMUs, restore the categorical exemption for onsite beneficial use of CCR, and allow for site-specific flexibilities for closures of CCR units through a CCR permitting program. EPA is accepting comments on the proposal until June 12, 2026. No assurance can be provided as to when and how federal CCR regulations will change further, when the legal challenges to the Legacy CCR Rule will be resolved, how the EPA’s interpretations or further EPA CCR Rule reforms will be resolved, or whether such challenges will be decided in the Company’s favor. Talen continues to review the Legacy CCR Rule provisions that went into effect in 2024, perform the required applicability assessments, and await additional EPA CCR Rule reforms. As a result of the EPA’s February 2026 CCRMU Extension Rule, initial facility evaluation reports to identify CCR areas which may become regulated and subject to the rule’s requirements are now due in February 2027. Following that, site investigation may be required to further investigate applicability, and a subsequent facility report is due in February 2028. The Company has initiated reviews under the facility evaluation report requirements at locations with ash impoundments that have long since ceased coal operations as well as at locations with current coal operations to meet these deadlines. No assurance can be provided as to whether any specific ash impoundments owned by the Company may or may not be within scope of the updated Legacy CCR Rule until the Company completes its assessments within the regulatory timeframe. As of March 31, 2026, the Company has recognized cost estimates in complying with the Legacy CCR Rule’s initial compliance requirements and deadlines, including the initial groundwater monitoring requirements. The Company does not yet have sufficient information available to estimate costs for the future compliance obligations under the rule. As the Company continues its applicability evaluations and site assessments to determine the scope of work on its properties imposed by the new rule, additional new AROs and (or) revisions could be required. It is expected estimates will be available, under the timeline provided for by the regulations, as described above, at the completion of the initial facility evaluation reports or at the completion of a subsequent site investigation. Such AROs or ARO changes could be material and, as a result, may have a material impact on Talen’s operations and (or) financial condition. Certain Resolved Matters See Note 9 to the Annual Financial Statements for certain legal matters previously resolved. Guarantees and Other Assurances In the normal course of business, the Company enters into agreements to provide financial performance assurance to third parties on behalf of certain subsidiaries. These agreements primarily support or enhance the stand-alone creditworthiness attributed to a subsidiary or facilitate the commercial activities in which these subsidiaries engage. Such agreements may include guarantees, stand-by LCs, and (or) surety bonds. Additionally, they may include customary indemnifications to third parties related to asset sales and other transactions. The probability of expected material payment and (or) performance for these assurance agreements is believed to be remote. Surety Bonds. Surety bonds provide financial performance assurance to third parties on behalf of certain Company subsidiaries for obligations including but not limited to environmental obligations and AROs. In the event of nonperformance by the applicable subsidiary, the beneficiary would make a claim to the surety, and the Company would be required to reimburse any payment by the surety. Talen’s liability with respect to any particular surety bond is released once the obligations secured by the surety bond are performed. Surety bond providers generally have the right to request additional collateral or request that such bonds be replaced by alternate surety providers. As of March 31, 2026 and December 31, 2025, the aggregate amount of surety bonds outstanding was $211 million and $228 million, respectively, including surety bonds posted on behalf of Talen Montana as discussed below. Talen Montana Financial Assurance. Pursuant to the Colstrip Administrative Order on Consent (the “Colstrip AOC”), Talen Montana, in its capacity as the Colstrip operator, is obligated to close and remediate coal ash disposal impoundments at Colstrip. The Colstrip AOC specifies an evaluation process between Talen Montana and the Montana Department of Environmental Quality (the “MDEQ”) on the scope of remediation and closure activities, requires the MDEQ to approve such scope, and requires financial assurance to be provided to the MDEQ on approved plans. Each of the co-owners of Colstrip has provided its proportionate share of financial assurance to the MDEQ for estimates of coal ash disposal impoundments remediation and closure activities approved by the MDEQ. The aggregate amount of surety bonds posted to the MDEQ on behalf of Talen Montana’s proportionate share of such activities was $103 million and $114 million as of March 31, 2026 and December 31, 2025, respectively. Talen Montana’s surety bond requirements may increase due to scope changes, cost revisions, and (or) other factors when the MDEQ conducts annual reviews of approved remediation and closure plans as required under the Colstrip AOC. The surety bond requirements are expected to decrease as Colstrip’s coal ash impoundments remediation and closure activities are completed. See Note 8 for additional information on Colstrip AROs.

Acquisitions and Divestitures - 2026 Pending Acquisitions (Details) - Cornerstone Acquisition - Forecast $ in Millions	6 Months Ended
	Jun. 30, 2026 USD ($) MW shares
Asset Acquisition [Line Items]
Consideration transferred \| $	$ 3,450
Payments to acquire businesses \| $	$ 2,550
Payments to acquire business, number of shares (in shares) \| shares	2,400,000
Payments to acquire business, value of stock \| $	$ 900
Lawrenceburg Power Plant
Asset Acquisition [Line Items]
Power generating capacity or generation plant \| MW	1,120
Waterford Energy Center
Asset Acquisition [Line Items]
Power generating capacity or generation plant \| MW	875
Darby Generating Station
Asset Acquisition [Line Items]
Power generating capacity of combustion turbine \| MW	456

Stockholders' Equity

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Stockholders' Equity

15. Stockholders’ Equity

Share Repurchase Program

In September 2025, the Board of Directors approved an increase in the existing capacity of the Company’s SRP from $995 million to $2 billion and extended the expiration date from December 31, 2026 to December 31, 2028. These changes to the SRP became effective in November 2025 upon the completion of the Freedom and Guernsey Acquisitions. The remaining capacity under the SRP as of March 31, 2026 was $1.9 billion.

As of March 31, 2026, the Company has repurchased approximately 24% of TEC’s outstanding shares of common stock since their issuance in May 2023 for an aggregate $2.1 billion, exclusive of transaction costs and excise taxes.

Summary of activity under the SRP:



	Three Months Ended March 31, 2026		Three Months Ended March 31, 2025
		Number of Shares	Share Price (a)		Total Amount		Number of Shares	Share Price (a)		Total Amount
Share repurchases		300,000	$	336.42	$	101	452,130	$	186.24	$	85
Share retirements		(300,000)	336.42		(101)		(452,130)	186.24		(85)

__________________

(a)Weighted average price per share, including transaction costs and excise taxes.

As of March 31, 2026, all repurchased shares have been retired. See Note 1 to the Annual Financial Statements for the accounting policy related to treasury stock and retirement of treasury stock.

Accumulated Other Comprehensive Income

Changes in AOCI for the periods were:


	Three Months Ended March 31,
	2026		2025
Beginning balance	$	(4)	$	(12)
Gains (losses) arising during the period	(9)		6
Reclassifications to Consolidated Statements of Operations	(2)		(2)
Income tax benefit (expense)	4		(2)
Other comprehensive income (loss)	(7)		2

Accumulated other comprehensive income (loss)	$	(11)	$	(10)

The components of AOCI, net of tax, as of March 31, were:


	Three Months Ended March 31,
	2026		2025
Available-for-sale securities unrealized gain (loss), net	$	(4)	$	—

Postretirement benefit prior service credits (costs), net	11		13
Postretirement benefit actuarial gain (loss), net	(18)		(23)
Accumulated other comprehensive income (loss)	$	(11)	$	(10)

Reclassification adjustments from AOCI to the Consolidated Statements of Operations were non-material amounts for the three months ended March 31, 2026 and 2025.

The postretirement obligations components of AOCI are not presented in their entirety on the Consolidated Statements of Operations during the periods; rather, they are included in the computation of net periodic defined benefit costs (credits). See Note 12 for additional information.

- Definition

The entire disclosure for equity.

+ References

+ Details

Nuclear Decommissioning Trust Funds - Schedule of Maturities for Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Maturities within one year	$ 11	$ 23
Maturities within two to five years	231	233
Maturities thereafter	533	521
Debt securities, fair value	$ 775	$ 777

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-SubTopic 10
-Topic 825
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-10

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
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-URI https://asc.fasb.org/1943274/2147482881/825-10-55-12

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 103
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-103

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
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-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 1
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

Risk Management, Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Net Notional Volumes of Open Commodity Derivatives and Interest Rate Derivatives

The net notional volumes of commodity derivatives were:



	March 31, 2026 (a)	December 31, 2025 (a)
Power (MWh)	(66,143,342)	(59,634,723)
Natural gas (MMBtu)	189,897,762	169,209,022
Emission allowances (tons)	—	—

__________________

(a)The volumes may be different than the contractual volumes, as the probability that option contracts will be exercised is considered in the volumes displayed.

Open interest rate derivatives range in maturity through 2029. The net notional volumes of open interest rate derivatives were:



	March 31, 2026		December 31, 2025
Interest rate (in millions)	$	990	$	990

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

Balance Sheets Presentation. The fair value of derivative instruments presented within assets and liabilities on the Consolidated Balance Sheets were:



	March 31, 2026				December 31, 2025
	Assets		Liabilities		Assets		Liabilities
Commodity contracts	$	32	$	248	$	56	$	97
Interest rate contracts	1		2		—		4

Total current derivative instruments	33		250		56		101
Commodity contracts	10		40		4		59
Interest rate contracts	—		9		—		8
Total non-current derivative instruments	$	10	$	49	$	4	$	67

Schedule of Effect of Netting, Offsetting Assets


	Gross Derivative Instruments		Eligible for Offset		Net Derivative Instruments		Collateral (Posted) Received		Net Amounts
March 31, 2026
Assets	$	610	$	(552)	$	58	$	(15)	$	43
Liabilities	917		(552)		365		(66)		299
December 31, 2025
Assets	$	456	$	(396)	$	60	$	—	$	60
Liabilities	608		(396)		212		(44)		168

Schedule of Effect of Netting, Offsetting Liabilities


	Gross Derivative Instruments		Eligible for Offset		Net Derivative Instruments		Collateral (Posted) Received		Net Amounts
March 31, 2026
Assets	$	610	$	(552)	$	58	$	(15)	$	43
Liabilities	917		(552)		365		(66)		299
December 31, 2025
Assets	$	456	$	(396)	$	60	$	—	$	60
Liabilities	608		(396)		212		(44)		168

Schedule of Derivative Instruments, Gain (Loss)

The location and pre-tax effect of “Derivative instruments” presented on the Consolidated Statements of Operations for the periods were:


	Three Months Ended March 31,
		2026		2025
Realized gain (loss) on commodity contracts
Energy revenues (a)		$	(327)	$	(27)
Fuel and energy purchases (a)		52		24
Unrealized gain (loss) on commodity contracts
Operating revenues (b)		(112)		(241)
Energy expenses (b)		(42)		59
Realized and unrealized gain (loss) on interest rate contracts
Interest expense and other finance charges		2		(13)

__________________

(a)Does not include those derivative instruments that settle through physical delivery.

(b)Presented as “Unrealized gain (loss) on derivative instruments” on the Consolidated Statements of Operations.

Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Millions

Mar. 31, 2026

Dec. 31, 2025

Assets

Cash and cash equivalents

$ 1,025

$ 689

Restricted cash and cash equivalents (Note 16)

Accounts receivable (Note 3)

158

196

Inventory, net (Note 5)

244

278

Derivative instruments (Notes 2 and 11)

Other current assets

Total current assets

1,509

1,349

Property, plant and equipment, net (Note 7)

7,499

7,546

Nuclear decommissioning trust funds (Notes 6 and 11)

1,869

1,900

Derivative instruments (Notes 2 and 11)

Other noncurrent assets

106

Total Assets

10,993

10,905

Liabilities and Equity

Long-term debt, due within one year (Notes 10 and 11)

Accrued interest

126

Accounts payable and other accrued liabilities

248

281

Derivative instruments (Notes 2 and 11)

250

101

Stock-based compensation liabilities (Note 13)

477

501

Other current liabilities

Total current liabilities

1,210

1,050

Long-term debt (Notes 10 and 11)

6,778

6,782

Derivative instruments (Notes 2 and 11)

Postretirement benefit obligations (Note 12)

221

229

Asset retirement obligations and accrued environmental costs (Note 8)

496

494

Deferred income taxes

487

486

Acquired fuel supply contract liabilities

633

662

Other noncurrent liabilities

Total Liabilities

9,920

9,812

Commitments and Contingencies (Note 9)

Stockholders' Equity (Note 15)

Common stock ($0.001 par value, 350,000,000 shares authorized)

^[1]

Additional paid-in capital

1,722

1,709

Accumulated retained earnings (deficit)

(638)

(612)

Accumulated other comprehensive income (loss)

(11)

(4)

Total Stockholders' Equity

1,073

1,093

Total Liabilities and Stockholders' Equity

$ 10,993

$ 10,905

[1]	(a)45,395,007 and 45,687,828 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively.

Stock-Based Compensation - Schedule of Nonvested Performance Stock Units and Restricted Stock Units (Details)	3 Months Ended
	Mar. 31, 2026 $ / shares Rate shares
Performance stock units
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning of the period (in shares)	1,058,334
Granted (in shares)	145,911
Balance at the end of the period (in shares)	1,204,245
Weighted-Average Grant Date Fair Value per Unit
Balance at the beginning of the period (in dollars per share) \| $ / shares	$ 147.45
Granted (in dollars per share) \| $ / shares	2,045.2
Balance at the end of the period (in dollars per share) \| $ / shares	$ 583.67
Non-vested PSUs based on share price (in shares)	1,405,355
Performance stock units \| Minimum
Weighted-Average Grant Date Fair Value per Unit
Actual amount of PSUs earned by participants, percentage \| Rate	0.00%
Performance stock units \| Maximum
Weighted-Average Grant Date Fair Value per Unit
Actual amount of PSUs earned by participants, percentage \| Rate	200.00%
Liability-Classified PSUs
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning of the period (in shares)	569,477
Granted (in shares)	0
Balance at the end of the period (in shares)	569,477
Equity-Classified PSUs
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning of the period (in shares)	488,857
Granted (in shares)	145,911
Balance at the end of the period (in shares)	634,768
Restricted stock units
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning of the period (in shares)	340,653
Granted (in shares)	75,687
Balance at the end of the period (in shares)	416,340
Weighted-Average Grant Date Fair Value per Unit
Balance at the beginning of the period (in dollars per share) \| $ / shares	$ 106.18
Granted (in dollars per share) \| $ / shares	391.43
Balance at the end of the period (in dollars per share) \| $ / shares	$ 193.70
Liability-Classified PSUs
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning of the period (in shares)	169,642
Granted (in shares)	0
Balance at the end of the period (in shares)	169,642
Equity-Classified RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance at the beginning of the period (in shares)	171,011
Granted (in shares)	75,687
Balance at the end of the period (in shares)	246,698

Condensed Consolidated Statements Of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 63	$ (135)
Other Comprehensive Income (Loss)
Available-for-sale securities unrealized gain (loss), net (Note 6)	(9)	6
Income tax benefit (expense)	3	(2)
Gains (losses) arising during the period, net of tax	(6)	4
Available-for-sale securities unrealized (gain) loss, net (Note 6)	(1)	(1)
Postretirement benefit prior service (credits) costs, net (Note 12)	(1)	(1)
Income tax (benefit) expense	1	0
Reclassifications from AOCI, net of tax	(1)	(2)
Total Other Comprehensive Income (Loss)	(7)	2
Comprehensive Income (Loss)	$ 56	$ (133)

Revenue

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Revenue

3. Revenue

The components of operating revenues for the periods were:


	Three Months Ended March 31,
		2026		2025
Electricity sales and ancillary services, ISO/RTO		$	1,336	$	582
Capacity revenues		207		49
Physical electricity sales, bilateral contracts, other		25		23

Total revenue from contracts with customers		1,568		654
Realized and unrealized gain (loss) on derivative instruments		(439)		(268)

Other revenue		—		4
Operating revenues		$	1,129	$	390

Accounts Receivable

“Accounts receivable” presented on the Consolidated Balance Sheets were:


	March 31, 2026		December 31, 2025
Customer accounts receivable	$	109	$	160
Other accounts receivable	49		36
Accounts receivable	$	158	$	196

During the three months ended March 31, 2026, and 2025, there were no significant changes in accounts receivable other than normal receivable recognition and collection transactions. See Note 2 for additional information on Talen’s credit risk on the carrying value of its receivables.

Future Performance Obligations

Talen’s estimated future fixed fee performance obligations primarily include capacity volumes awarded, net of capacity repurchases by the Company, through PJM BRAs and incremental PJM capacity auctions. See Note 9 for additional information on the PJM BRAs.

As of March 31, 2026, future performance obligations that were unsatisfied or partially unsatisfied were:


	2026 (a)		2027		2028 (b)		2029 (b)		2030 (b)
Future performance obligations	$	762	$	1,060	$	443	$	—	$	—

__________________

(a)Estimated for the period from April 1 through December 31, 2026.

(b)As PJM BRAs have not yet occurred for periods after the 2027/2028 PJM Capacity Year, there are no future performance obligations after May 31, 2028.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
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-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating Activities
Net Income (Loss)	$ 63	$ (135)
Non-cash reconciliation adjustments:
Unrealized (gains) losses on derivative instruments (Note 2)	152	196
Depreciation, amortization and accretion (Note 16)	66	72
Nuclear decommissioning trust funds (gain) loss, net (excluding interest and fees) (Note 6)	35	23
Nuclear fuel amortization (Note 7)	24	26
Deferred income taxes	5	(70)
Stock-based compensation (Note 13)	(1)	11
Other (Note 16)	4	26
Changes in assets and liabilities:
Accounts receivable	38	23
Inventory, net	34	83
Other assets	19	22
Accounts payable and accrued liabilities	(23)	(60)
Accrued interest	66	36
Collateral received (posted), net	(8)	(67)
Other liabilities	(13)	(67)
Net cash provided by (used in) operating activities	461	119
Investing Activities
Nuclear decommissioning trust funds investment purchases (Note 6)	(112)	(592)
Nuclear decommissioning trust funds investment sale proceeds (Note 6)	99	581
Property, plant and equipment expenditures (Note 7)	(42)	(18)
Nuclear fuel expenditures (Note 7)	(27)	(46)
Other	10	7
Net cash provided by (used in) investing activities	(72)	(68)
Financing Activities
Revolving credit facility borrowings (Note 10)	500	0
Revolving credit facility repayments (Note 10)	(500)	0
Share repurchases (Note 15)	(100)	(83)
Debt repayments (Note 10)	(7)	(4)
Deferred financing costs	(3)	(9)
Other	(4)	0
Net cash provided by (used in) financing activities	(114)	(96)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents	275	(45)
Beginning of period cash and cash equivalents and restricted cash and cash equivalents	752	365
End of period cash and cash equivalents and restricted cash and cash equivalents	$ 1,027	$ 320

Asset Retirement Obligations and Accrued Environmental Costs - Schedule of Asset Retirement Obligations and Accrued Environmental Costs (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligations	$ 522	$ 514
Accrued environmental costs	20	20
Total asset retirement obligations and accrued environmental costs	542	534
Less: asset retirement obligations and accrued environmental costs due within one year	46	40
Asset retirement obligations and accrued environmental costs due after one year	$ 496	$ 494

Property, Plant and Equipment - Schedule of Components of Depreciation, Amortization and Accretion Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 77	$ 55
Amortization expense	1	5
Accretion expense	14	14
Depreciation, amortization and accretion	$ 92	$ 74

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References + Details

Revenue - Schedule of Components of Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 1,568	$ 654
Realized and unrealized gain (loss) on derivative instruments	(439)	(268)
Other revenue	0	4
Operating revenues	1,129	390
Electricity sales and ancillary services, ISO/RTO
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,336	582
Capacity revenues
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	207	49
Operating revenues	207	49
Physical electricity sales, bilateral contracts, other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 25	$ 23

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

Inventory - Schedule of Inventory (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Inventory Disclosure [Abstract]
Coal	$ 73	$ 94
Oil products	41	57
Fuel inventory for electric generation	114	151
Materials and supplies, net	128	124
Environmental products	2	3
Inventory, net	$ 244	$ 278

Supplemental Cash Flow Information - Schedule of Supplemental Consolidated Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash paid (received) during the period
Interest and other finance charges, net of capitalized interest	$ 52	$ 23
Income taxes, net	(4)	19
Unrealized (gain) loss on derivative instruments included on the Statements of Cash Flows
Commodity contracts	154	182
Interest rate swap contracts (interest expense)	(2)	14
Unrealized (gain) loss on derivative instruments	152	196
Depreciation, amortization and accretion included on the Statements of Cash Flows
Depreciation, amortization and accretion	92	74
Amortization of acquired fuel supply contract liabilities	(29)	0
Other	3	(2)
Depreciation, amortization and accretion	66	72
Reconciliation of other non-cash operating activities
Derivative option premium amortization	5	31
Other	(1)	(5)
Total	4	26
Non-cash investing activities
Accrued PP&E additions not paid at period end	$ 15	$ 12

Business, Basis of Presentation, and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	These Interim Financial Statements, which are prepared in accordance with GAAP and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”) for Quarterly Reports on Form 10-Q, include: (i) the accounts of all controlled subsidiaries; (ii) elimination adjustments for intercompany transactions between controlled subsidiaries; (iii) any undivided interests in jointly owned facilities consolidated on a proportionate basis; and (iv) all adjustments considered necessary for a fair statement of the information set forth. All adjustments are of a normal recurring nature except as otherwise disclosed. Certain information and note disclosures have been condensed or omitted from the Interim Financial Statements in accordance with GAAP. These Interim Financial Statements and Notes thereto should be read in conjunction with the Annual Financial Statements and Notes thereto. The results of operations presented in our Interim Financial Statements are not necessarily indicative of the results to be expected for the full year or for other future periods because interim period results can be disproportionately influenced by operational developments, seasonality, and various other factors.
Principles of Consolidation	These Interim Financial Statements, which are prepared in accordance with GAAP and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”) for Quarterly Reports on Form 10-Q, include: (i) the accounts of all controlled subsidiaries; (ii) elimination adjustments for intercompany transactions between controlled subsidiaries; (iii) any undivided interests in jointly owned facilities consolidated on a proportionate basis; and (iv) all adjustments considered necessary for a fair statement of the information set forth. All adjustments are of a normal recurring nature except as otherwise disclosed. Certain information and note disclosures have been condensed or omitted from the Interim Financial Statements in accordance with GAAP. These Interim Financial Statements and Notes thereto should be read in conjunction with the Annual Financial Statements and Notes thereto. The results of operations presented in our Interim Financial Statements are not necessarily indicative of the results to be expected for the full year or for other future periods because interim period results can be disproportionately influenced by operational developments, seasonality, and various other factors.
Reclassifications	Certain amounts in the prior period financial statements were reclassified to conform to the current period’s presentation. The reclassifications did not affect operating income, net income, total assets, total liabilities, net equity, or cash flows.
Use of Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

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+ Details

Earnings Per Share

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Earnings Per Share

14. Earnings Per Share

Basic EPS is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the applicable period. Diluted EPS is computed by dividing income by the weighted-average number of shares of common stock outstanding, increased by incremental shares that would be outstanding if potentially dilutive non-participating securities were converted to common stock as calculated using the treasury stock method. EPS for the periods were:


	Three Months Ended March 31,
		2026		2025
Numerator: (Millions of Dollars)
Net Income (Loss)		$	63	$	(135)




Denominator: (Thousands)
Weighted-Average Number of Common Shares Outstanding - Basic		45,612		45,849

Restricted stock units		186		—
Performance stock units		1,633		—
Weighted-Average Number of Common Shares Outstanding - Diluted		47,431		45,849

Earnings per Share - Basic		$	1.38	$	(2.94)
Earnings per Share - Diluted		1.33		(2.94)

Diluted EPS for the three months ended March 31, 2026 excluded (i) 145,911 PSUs because their performance targets were not met as of March 31, 2026; and (ii) 3,142 PSUs and 1,610 RSUs due to their anti-dilutive nature. As there was a Net Loss for the three months ended March 31, 2025, the computation of diluted EPS excludes 486,688 RSUs and 2,109,479 PSUs.

Long-Term Debt and Other Credit Facilities - Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2026	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Secured ISDAs		$ 43	$ 60
Secured ISDAs
Debt Instrument [Line Items]
Secured ISDAs		343
Subsequent Event
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Secured Debt \| Subsequent Event
Debt Instrument [Line Items]
Repayments debt	$ 1,200
Repayments of debt, expenses to be incurred	60
2031 Unsecured Notes \| Unsecured Notes \| Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,500
Interest rate	6.125%
Debt covenant, amount redeemed if acquisition has not been consummated	$ 1,050
2033 Unsecured Notes \| Unsecured Notes \| Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount	$ 2,500
Interest rate	6.375%
Debt covenant, amount redeemed if acquisition has not been consummated	$ 1,750
RCF \| Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount		900
RCF \| Line of Credit \| Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount	1,350
LCF \| Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,100
LCF \| Line of Credit \| Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,500

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Finite-Lived Assets
Gross Value	$ 8,307	$ 8,256
Accumulated Depreciation	(808)	(710)
Carrying Value	7,499	7,546
Electric generation
Finite-Lived Assets
Gross Value	7,514	7,522
Accumulated Depreciation	(555)	(481)
Carrying Value	6,959	7,041
Nuclear fuel
Finite-Lived Assets
Gross Value	517	403
Accumulated Depreciation	(236)	(213)
Carrying Value	281	190
Other property and equipment
Finite-Lived Assets
Gross Value	67	63
Accumulated Depreciation	(12)	(11)
Carrying Value	55	52
Capitalized software
Finite-Lived Assets
Gross Value	10	10
Accumulated Depreciation	(5)	(5)
Carrying Value	5	5
Construction work in progress
Finite-Lived Assets
Gross Value	199	258
Carrying Value	$ 199	$ 258
Minimum \| Electric generation
Finite-Lived Assets
Estimated Useful Life (years)	3 years
Minimum \| Nuclear fuel
Finite-Lived Assets
Estimated Useful Life (years)	1 year
Minimum \| Other property and equipment
Finite-Lived Assets
Estimated Useful Life (years)	3 years
Minimum \| Capitalized software
Finite-Lived Assets
Estimated Useful Life (years)	1 year
Maximum \| Electric generation
Finite-Lived Assets
Estimated Useful Life (years)	37 years
Maximum \| Nuclear fuel
Finite-Lived Assets
Estimated Useful Life (years)	6 years
Maximum \| Other property and equipment
Finite-Lived Assets
Estimated Useful Life (years)	24 years
Maximum \| Capitalized software
Finite-Lived Assets
Estimated Useful Life (years)	5 years

Nuclear Decommissioning Trust Funds - Unrealized Gains (Losses) In Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Equity securities, unrealized gains (losses)	$ (36)	$ (24)

Segments - Segments and Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting [Abstract]
Number of reportable segments not disclosed Flag	operating segment
Segment Reporting Information [Line Items]
Operating revenues	$ 1,129	$ 390
Operation, maintenance and development expenses	165	146
Interest expense and other finance charges	119	74
Capital expenditures	69	64
Operating Segments \| PJM
Segment Reporting Information [Line Items]
Operating revenues	1,110	367
Operation, maintenance and development expenses	158	138
Interest expense and other finance charges	0	0
Other segment items	473	20
Adjusted EBITDA	479	209
Capital expenditures	67	62
Operating Segments \| Other
Segment Reporting Information [Line Items]
Operating revenues	28	42
Operation, maintenance and development expenses	7	8
Interest expense and other finance charges	0	0
Adjusted EBITDA	9	9
Capital expenditures	2	1
Corporate and Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(9)	(19)
Interest expense and other finance charges	119	74
Adjusted EBITDA	(15)	(18)
Capital expenditures	$ 0	$ 1

Nuclear Decommissioning Trust Funds

3 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

Nuclear Decommissioning Trust Funds

6. Nuclear Decommissioning Trust Funds



	March 31, 2026								December 31, 2025
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Cash equivalents	$	16	$	—	$	—	$	16	$	16	$	—	$	—	$	16
Equity securities	388		706		(22)		1,072		385		739		(19)		1,105
Debt securities	780		4		(9)		775		773		7		(3)		777
Receivables (payables), net	6		—		—		6		2		—		—		2
NDT Funds	$	1,190	$	710	$	(31)	$	1,869	$	1,176	$	746	$	(22)	$	1,900

See Note 11 for additional information on the NDT fair value. There were no available-for-sale debt securities with credit losses as of March 31, 2026 and December 31, 2025.

As of March 31, 2026, there was no intent to sell available-for-sale debt securities with unrealized losses, and it is not more likely than not that each of these investments will be required to be sold before the recovery of its amortized cost. The aggregate fair value of available-for-sale debt securities with unrealized losses as of March 31, 2026 was:


	Fair Value		Unrealized Losses
Corporate debt securities	$	198	$	(4)
Municipal debt securities	61		(1)
U.S. Government debt securities	271		(4)
Debt securities in unrealized loss position	$	530	$	(9)

As of March 31, 2026, the aggregate fair value of debt securities whose carrying value was below the purchase price for a duration of one year or longer were $132 million and the unrealized losses related to such securities were non-material.

The contractual maturities for available-for-sale debt securities presented on the Consolidated Balance Sheets were:



	March 31, 2026		December 31, 2025
Maturities within one year	$	11	$	23
Maturities within two to five years	231		233
Maturities thereafter	533		521
Debt securities, fair value	$	775	$	777

The sales proceeds, gains, and losses for available-for-sale debt securities for the periods were:


	Three Months Ended March 31,
		2026		2025
Sales proceeds of NDT funds investments (a)		$	80	$	576
Realized gains		1		3
Realized losses		—		(2)

__________________

(a)Sales proceeds are used to pay income taxes and trust management fees. Remaining proceeds are reinvested in the NDT.

The net unrealized gains and losses recognized associated with equity securities still held at the end of the reporting periods were:


	Three Months Ended March 31,
		2026		2025
Equity securities, unrealized gains (losses)		$	(36)	$	(24)

- Definition

The entire disclosure for investments owned by investment company.

+ References + Details