Expenses by Nature

12 Months Ended

Dec. 31, 2024

Analysis of income and expense [abstract]

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.