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Revenue (Tables) | 6 Months Ended
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Jun. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Components of Operating Revenues | The components of operating revenues for the periods were:
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |  |  |
|  | 2025 |  | 2024 |  | 2025 |  | 2024 |  |  |  |  |
Capacity revenues |  | $ | 88 |  |  | $ | 46 |  |  | $ | 137 |  |  | $ | 91 |  |  |  |  |  |
Electricity sales and ancillary services, ISO/RTO |  | 307 |  |  | 249 |  |  | 889 |  |  | 514 |  |  |  |  |  |
Physical electricity sales, bilateral contracts, other |  | 14 |  |  | 22 |  |  | 37 |  |  | 86 |  |  |  |  |  |
Other revenue from customers |  | — |  |  | 29 |  |  | — |  |  | 71 |  |  |  |  |  |
Total revenue from contracts with customers |  | 409 |  |  | 346 |  |  | 1,063 |  |  | 762 |  |  |  |  |  |
Realized and unrealized gain (loss) on derivative instruments |  | 218 |  |  | 100 |  |  | (50) |  |  | 157 |  |  |  |  |  |
Nuclear PTC |  | — |  |  | 39 |  |  | — |  |  | 74 |  |  |  |  |  |
Other revenue |  | 3 |  |  | 4 |  |  | 7 |  |  | 5 |  |  |  |  |  |
Operating revenues |  | $ | 630 |  |  | $ | 489 |  |  | $ | 1,020 |  |  | $ | 998 |  |  |  |  |  |
Schedule of Accounts Receivable | “Accounts receivable” presented on the Consolidated Balance Sheets were:
|  | June 30, 2025 |  | December 31, 2024
Customer accounts receivable |  | $ | 154 |  |  | $ | 66 |
Other accounts receivable |  | 72 |  |  | 57 |
Accounts receivable |  | $ | 226 |  |  | $ | 123 |
Schedule of Future Performance Obligations | The expected future period capacity revenues subject to unsatisfied or partially unsatisfied performance obligations were:
|  | 2025 (a) |  | 2026 |  | 2027 |  | 2028 |  | 2029
Expected capacity revenues as of June 30, 2025 (b) |  | $ | 333 |  |  | $ | 275 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | — |
2026/2027 PJM Capacity Year (c) |  | — |  |  | 472 |  |  | 333 |  |  | — |  |  | — |
Total expected capacity revenues |  | $ | 333 |  |  | $ | 747 |  |  | $ | 336 |  |  | $ | 1 |  |  | $ | — |
__________________ (a)Estimated for the period from July 1, 2025 through December 31, 2025. (b)PJM capacity revenues are estimated for the period from January 1, 2026 through May 31, 2026 for the remainder of the 2025/2026 PJM Capacity Year. (c)PJM capacity revenues are estimated for the period from June 1, 2026 through May 31, 2027 based on the results of the 2026/2027 PJM BRA held in July 2025. Talen cleared 6,702 MWs at a price of $329.17/MWd for the MAAC, PPL, and PSEG locational deliverability areas.

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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