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Financial instruments - Long-term Energy Derivative Contracts (Detail) | Jun. 30, 2023 dth MWh $ / MWh
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Derivative [Line Items] |
Nonmonetary notional amount | dth | 2,755,733
Cash flow hedge | Illinois Hub, Expiry September 2030 |
Derivative [Line Items] |
Nonmonetary notional amount | MWh | 3,772,462
Receive average prices (per MW-hr) | $ / MWh | 25.00
Cash flow hedge | PJM Western HUB, Expiry December 2028 |
Derivative [Line Items] |
Nonmonetary notional amount | MWh | 404,612
Receive average prices (per MW-hr) | $ / MWh | 29.00
Cash flow hedge | NI HUB, Expiry December 2027 |
Derivative [Line Items] |
Nonmonetary notional amount | MWh | 1,707,551
Receive average prices (per MW-hr) | $ / MWh | 22.00
Cash flow hedge | ERCOT North HUB, Expiry December 2027 |
Derivative [Line Items] |
Nonmonetary notional amount | MWh | 1,471,065
Receive average prices (per MW-hr) | $ / MWh | 36.00

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