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Financial instruments - Long-term Energy Derivative Contracts (Detail) - Cash flow hedge | Dec. 31, 2023 MWh $ / MWh
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PJM Western HUB, Expiry December 2028 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 353,597
Receive average prices (per MW-hr) | $ / MWh | 29.19
NI HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 1,492,926
Receive average prices (per MW-hr) | $ / MWh | 21.34
ERCOT North HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 1,332,645
Receive average prices (per MW-hr) | $ / MWh | 36.46
Illinois Hub, Expiry September 2030 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 3,534,802
Receive average prices (per MW-hr) | $ / MWh | 24.54

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