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Financial instruments - Long-term Energy Derivative Contracts (Detail) - Cash flow hedge	Dec. 31, 2021 MWh $ / MWh $ / MWh
Illinois Hub, Expiry September 2030
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	4,585,008
Receive average prices (per MW-hr) | $ / MWh	24.54
PJM Western HUB, Expiry December 2028
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	527,931
Receive average prices (per MW-hr) | $ / MWh	32.11
NI HUB, Expiry December 2027
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	2,465,763
Receive average prices (per MW-hr) | $ / MWh	23.67
ERCOT North HUB, Expiry December 2027
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	1,998,095
Receive average prices (per MW-hr) | $ / MWh	36.46
Salisbury, Expiry February 2022
Derivative [Line Items]
Notional quantity (MW-hrs) | MWh	11,328
Receive average prices (per MW-hr) | $ / MWh	38.95

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The average strike price on the group of price risk option contracts such as put options or call options.

+ References

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

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