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Expenses by Nature | 12 Months Ended
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Dec. 31, 2024
Analysis of income and expense [abstract] |
Expenses by Nature | Expenses by Nature Fuel, Purchased Power and Operations, Maintenance and Administration (OM&A) Fuel and purchased power and OM&A expenses classified by nature are as follows:
Year ended Dec. 31 |  |  | 2024 | 2023(1) | 2022
|  |  |  | Fuel and purchased power | OM&A | Fuel and purchased power | OM&A | Fuel and purchased power | OM&A
Gas fuel costs |  |  |  |  | 369 |  | — |  | 384 |  | — |  | 578 |  | — |
Coal fuel costs |  |  |  |  | 123 |  | — |  | 177 |  | — |  | 146 |  | — |
Royalty, land lease, other direct costs |  |  |  |  | 28 |  | — |  | 25 |  | — |  | 25 |  | — |
Purchased power |  |  |  |  | 419 |  | — |  | 474 |  | — |  | 514 |  | — |
Salaries and benefits |  |  |  |  | — |  | 296 |  | — |  | 254 |  | — |  | 263 |
Other operating expenses(1) |  |  |  |  | — |  | 359 |  | — |  | 285 |  | — |  | 258 |
Total |  |  |  |  | 939 |  | 655 |  | 1,060 |  | 539 |  | 1,263 |  | 521 |
(1)Included in OM&A costs for 2023 was $14 million related to the write-down of parts and material inventory related to our natural-gas-fired facilities. Brazeau — Spinning Reserve Self-Report In 2022 a provision of $20 million was initially recognized in revenue reflecting a potential disgorgement of revenue and $2 million for potential penalties and fines. The final assessment contained no disgorgement of revenue and penalties of $33 million. This resulted in a reversal of the original disgorgement provision in revenue in the year ended Dec. 31, 2024 and recognition of the full amount of the penalties assessed in OM&A. Refer to Note 37 for details. Acquisition-related transaction and restructuring costs During the year ended Dec. 31, 2024, the Company recognized $24 million in acquisition-related transaction and restructuring costs in OM&A costs as part of other operating expenses related to the acquisition of Heartland, mainly comprising severance, legal and consulting fees.

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