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Financial instruments - Long-term Energy Derivative Contracts (Details) - Cash flow hedge | Jun. 30, 2024 MWh $ / MWh
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Illinois Hub, Expiry September 2030 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 3,245,679
Receive average prices (per MW-hr) | $ / MWh | 24.54
PJM Western HUB, Expiry December 2028 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 287,686
Receive average prices (per MW-hr) | $ / MWh | 29.14
NI HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 1,220,001
Receive average prices (per MW-hr) | $ / MWh | 21.31
ERCOT North HUB, Expiry December 2027 |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 1,137,027
Receive average prices (per MW-hr) | $ / MWh | 36.46

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