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Revenue | 12 Months Ended
--- | ---
Dec. 31, 2024
Disclosure of revenue from contracts with customers [Abstract] |
Revenue | Revenue A. Disaggregation of Revenue The majority of the Company's revenues are derived from the sale of power, capacity and environmental and tax attributes, leasing of power facilities and from asset optimization activities, which the Company disaggregates into the following groups for the purpose of determining how economic factors affect the recognition of revenue.
Year ended Dec. 31, 2024 | Hydro | Wind and Solar | Gas | Energy Transition | Energy Marketing | Corporate(1) | Total
Revenues from contracts with customers |  |  |  |  |  |  |
Power and other | 36 |  | 242 |  | 494 |  | 12 |  | — |  | — |  | 784 |
Environmental and tax attributes(2) | 61 |  | 77 |  | 2 |  | — |  | — |  | (34) |  | 106 |
Revenue from contracts with customers | 97 |  | 319 |  | 496 |  | 12 |  | — |  | (34) |  | 890 |
Revenue from derivatives and other trading activities(3) | 16 |  | (69) |  | 282 |  | 311 |  | 168 |  | — |  | 708 |
Revenue from merchant sales | 287 |  | 71 |  | 546 |  | 291 |  | — |  | — |  | 1,195 |
Other(4) | 9 |  | 15 |  | 26 |  | 2 |  | — |  | — |  | 52 |
Total revenue | 409 |  | 336 |  | 1,350 |  | 616 |  | 168 |  | (34) |  | 2,845 |
Revenues from contracts with customers |  |  |  |  |  |  |
Timing of revenue recognition |  |  |  |  |  |  |
At a point in time | 61 |  | 28 |  | — |  | 12 |  | — |  | (34) |  | 67 |
Over time | 36 |  | 291 |  | 496 |  | — |  | — |  | — |  | 823 |
Total revenue from contracts with customers | 97 |  | 319 |  | 496 |  | 12 |  | — |  | (34) |  | 890 |
(1)The elimination of intercompany sales is reflected in the Corporate segment. (2)The environmental and tax attributes represent environmental attributes and production tax transfer sales not bundled with power and other sales. (3)Represents realized and unrealized gains or losses from hedging and derivative positions. Volatility and pricing in commodity markets can vary significantly from period to period and impact movements in derivative positions. (4)Other revenue includes production tax credits related to U.S. wind facilities subject to tax equity financing arrangements, total lease income from long-term contracts that meet the criteria of operating leases and other miscellaneous revenues.
Year ended Dec. 31, 2023 | Hydro | Wind and Solar | Gas | Energy Transition | Energy Marketing | Corporate | Total
Revenues from contracts with customers |  |  |  |  |  |  |
Power and other(1) | 30 |  | 204 |  | 400 |  | 12 |  | — |  | — |  | 646 |
Environmental and tax attributes(2) | 14 |  | 26 |  | — |  | — |  | — |  | — |  | 40 |
Revenue from contracts with customers | 44 |  | 230 |  | 400 |  | 12 |  | — |  | — |  | 686 |
Revenue from derivatives and other trading activities(1)(3) | 44 |  | (16) |  | (172) |  | 251 |  | 220 |  | — |  | 327 |
Revenue from merchant sales | 434 |  | 104 |  | 1,247 |  | 488 |  | — |  | — |  | 2,273 |
Other(4) | 11 |  | 18 |  | 39 |  | — |  | — |  | 1 |  | 69 |
Total revenue | 533 |  | 336 |  | 1,514 |  | 751 |  | 220 |  | 1 |  | 3,355 |
Revenues from contracts with customers |  |  |  |  |  |  |
Timing of revenue recognition |  |  |  |  |  |  |
At a point in time | 14 |  | 26 |  | — |  | 12 |  | — |  | — |  | 52 |
Over time | 30 |  | 204 |  | 400 |  | — |  | — |  | — |  | 634 |
Total revenue from contracts with customers | 44 |  | 230 |  | 400 |  | 12 |  | — |  | — |  | 686 |
(1)In the Wind and Solar segment, $14 million of mark-to-market losses were reclassified from revenue from contracts with customers to revenue from derivatives and other trading activities to conform to the current period presentation. (2)The environmental and tax attributes represent environmental attributes and production tax transfer sales not bundled with power and other sales. (3)Represents realized and unrealized gains or losses from hedging and derivative positions. Volatility and pricing in commodity markets can vary significantly from period to period and impact movements in derivative positions. (4)Other revenue includes production tax credits related to U.S. wind facilities subject to tax equity financing arrangements, total lease income from long-term contracts that meet the criteria of operating leases and other miscellaneous revenues.
Year ended Dec. 31, 2022 | Hydro | Wind and Solar | Gas | Energy Transition | Energy Marketing | Corporate | Total
Revenues from contracts with customers |  |  |  |  |  |  |
Power and other | 33 |  | 220 |  | 462 |  | 10 |  | — |  | — |  | 725 |
Environmental and tax attributes(1) | 1 |  | 50 |  | — |  | — |  | — |  | — |  | 51 |
Revenue from contracts with customers | 34 |  | 270 |  | 462 |  | 10 |  | — |  | — |  | 776 |
Revenue from derivatives and other trading activities(2) | — |  | (121) |  | (821) |  | 243 |  | 160 |  | (2) |  | (541) |
Revenue from merchant sales | 564 |  | 119 |  | 1,529 |  | 461 |  | — |  | — |  | 2,673 |
Other(3) | 8 |  | 21 |  | 39 |  | — |  | — |  | — |  | 68 |
Total revenue | 606 |  | 289 |  | 1,209 |  | 714 |  | 160 |  | (2) |  | 2,976 |
Revenues from contracts with customers |  |  |  |  |  |  |
Timing of revenue recognition |  |  |  |  |  |  |
At a point in time | 1 |  | 50 |  | — |  | 12 |  | — |  | — |  | 63 |
Over time | 33 |  | 220 |  | 462 |  | (2) |  | — |  | — |  | 713 |
Total revenue from contracts with customers | 34 |  | 270 |  | 462 |  | 10 |  | — |  | — |  | 776 |
(1)The environmental and tax attributes represent environmental attributes and production tax transfer sales not bundled with power and other sales. (2)Represents realized and unrealized gains or losses from hedging and derivative positions. Volatility and pricing in commodity markets can vary significantly from period to period and impact movements in derivative positions. (3)Other revenue includes production tax credits related to U.S. wind facilities subject to tax equity financing arrangements, total lease income from long-term contracts that meet the criteria of operating leases and other miscellaneous revenues. B. Performance Obligations The performance obligations in the Company's contracts with its customers include the provision of electricity and steam capacity; the delivery of electricity, thermal energy and environmental attributes; the provision of operation and maintenance services and water management services; and the supply of byproducts from coal generation. The aggregate amount of transaction prices allocated to remaining performance obligations (contract revenues that have not yet been recognized) as at Dec. 31, 2024, is approximately $2,336 million, with approximately $455 million expected to be recognized during the period 2025-2027; $391 million for the period of 2028-2030; $668 million for the period of 2031-2035; and $822 million for 2036 and thereafter. These amounts exclude revenues related to contracts that qualify for the invoice practical expedient and future revenues that are related to constrained variable consideration. In many of the Company’s contracts, elements of the transaction price are considered constrained, such as for variable revenues dependent upon future production volumes that are driven by customer or market demand or market prices that are subject to factors outside the Company’s influence. As a result, the amounts of future revenues disclosed above represent only a portion of future revenues that are expected to be realized by the Company from its contractual portfolio. Contract liabilities of $36 million as at Dec. 31, 2024 represent the consideration received from customers in advance of satisfying the related performance obligation by supplying the related goods. Revenue is recognized when the performance obligation is satisfied. $6 million of contract liabilities were acquired from Heartland (refer to Note 4).

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