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Revenue | 12 Months Ended
--- | ---
Dec. 31, 2022
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 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, 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 attributes(1) | 1 |  | 50 |  | — |  | — |  | — |  | — |  | 51 |
Revenue from contracts with customers | 34 |  | 270 |  | 462 |  | 10 |  | — |  | — |  | 776 |
Revenue from leases(2) | — |  | — |  | 32 |  | — |  | — |  | — |  | 32 |
Revenue from derivatives and other trading activities(3) | — |  | (87) |  | (821) |  | 243 |  | 160 |  | (2) |  | (507) |
Revenue from merchant sales | 564 |  | 86 |  | 1,529 |  | 461 |  | — |  | — |  | 2,640 |
Other | 8 |  | 20 |  | 7 |  | — |  | — |  | — |  | 35 |
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 attributes represent environmental attribute sales not bundled with power and other sales. (2) Total lease income from long-term contracts that meet the criteria of operating leases. (3) Represents realized and unrealized gains or losses from hedging and derivative positions.
Year ended Dec. 31, 2021 | Hydro | Wind and Solar | Gas | Energy Transition | Energy Marketing | Corporate | Total
Revenues from contracts with customers |  |  |  |  |  |  |
Power and other | 28 |  | 207 |  | 395 |  | 24 |  | — |  | — |  | 654 |
Environmental attributes(1) | — |  | 28 |  | — |  | — |  | — |  | — |  | 28 |
Revenue from contracts with customers | 28 |  | 235 |  | 395 |  | 24 |  | — |  | — |  | 682 |
Revenue from leases(2) | — |  | — |  | 19 |  | — |  | — |  | — |  | 19 |
Revenue from derivatives and other trading activities(3) | — |  | (14) |  | (118) |  | 138 |  | 211 |  | 4 |  | 221 |
Revenue from merchant sales | 345 |  | 68 |  | 808 |  | 546 |  | — |  | — |  | 1,767 |
Other | 10 |  | 16 |  | 5 |  | 1 |  | — |  | — |  | 32 |
Total revenue | 383 |  | 305 |  | 1,109 |  | 709 |  | 211 |  | 4 |  | 2,721 |
Revenues from contracts with customers |  |  |  |  |  |  |
Timing of revenue recognition |  |  |  |  |  |  |
At a point in time | — |  | 28 |  | 2 |  | 23 |  | — |  | — |  | 53 |
Over time | 28 |  | 207 |  | 393 |  | 1 |  | — |  | — |  | 629 |
Total revenue from contracts with customers | 28 |  | 235 |  | 395 |  | 24 |  | — |  | — |  | 682 |
(1) The environmental attributes represent environmental attribute sales not bundled with power and other sales. (2) Total lease income from long-term contracts that meet the criteria of operating leases. (3) Represents realized and unrealized gains or losses from hedging and derivative positions. Wind and Solar has been revised to present revenue classifications consistent with current period.
Year ended Dec. 31, 2020 | Hydro | Wind and Solar | Gas | Energy Transition | Energy Marketing | Corporate | Total
Revenues from contracts with customers |  |  |  |  |  |  |
Power and other | 141 |  | 238 |  | 465 |  | 156 |  | — |  | — |  | 1,000 |
Environmental attributes(1) | — |  | 23 |  | — |  | — |  | — |  | — |  | 23 |
Revenue from contracts with customers | 141 |  | 261 |  | 465 |  | 156 |  | — |  | — |  | 1,023 |
Revenue from leases(2) | — |  | — |  | 123 |  | — |  | — |  | — |  | 123 |
Revenue from derivatives and other trading activities(3) | — |  | 8 |  | (8) |  | 283 |  | 122 |  | 12 |  | 417 |
Revenue from merchant sales | 3 |  | 49 |  | 200 |  | 264 |  | — |  | — |  | 516 |
Other(4) | 8 |  | 11 |  | 7 |  | 1 |  | — |  | (5) |  | 22 |
Total revenue | 152 |  | 329 |  | 787 |  | 704 |  | 122 |  | 7 |  | 2,101 |
Revenues from contracts with customers |  |  |  |  |
Timing of revenue recognition |  |  |  |  |  |  |
At a point in time | — |  | 25 |  | 7 |  | 26 |  | — |  | — |  | 58 |
Over time | 141 |  | 236 |  | 458 |  | 130 |  | — |  | — |  | 965 |
Total revenue from contracts with customers | 141 |  | 261 |  | 465 |  | 156 |  | — |  | — |  | 1,023 |
(1) The environmental attributes represent environmental attribute sales not bundled with power and other sales. (2) Total lease income from certain PPAs and long-term contracts that meet the criteria of operating leases. (3) Represents realized and unrealized gains or losses from hedging and derivative positions. Wind and Solar has been revised to present revenue classifications consistent with current period. (4) Includes government incentives and other miscellaneous. 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, 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, 2022, is approximately $2,790 million, with approximately $465 million expected to be recognized during the period 2023-2025; $490 million for the period of 2026-2028; $750 million for the period of 2029-2033; and $1,085 million for 2034 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.

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