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Risk Management Activities - Commodity Derivative Instruments Not Designated as Hedging Instruments (Details) - Non-hedge - Commodity risk management | Dec. 31, 2024 MWh J t | Dec. 31, 2023 J MWh t
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Electricity |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 47,593,000 | 54,043,000
Notional amount purchased | 8,416,000 | 12,628,000
Natural Gas |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | J | 2,122,000 | 50,949,000
Notional amount purchased | J | 79,194,000 | 209,348,000
Transmission |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 0 | 0
Notional amount purchased | 292,000 | 856,000
Emissions |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 167,000 | 212,000
Notional amount purchased | 370,000 | 804,000
Notional amount sold | t | 1,850,000 | 4,450,000
Notional amount purchased | t | 150,000 | 5,125,000
Coal |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | t | 0 | 0
Notional amount purchased | t | 1,728,000 | 5,172,000

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