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Financial instruments - Long-term Energy Derivative Contracts (Detail) - Cash flow hedge | Jun. 30, 2020 MWh $ / MWh $ / MWh
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PJM Western HUB |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 692,015
Receive average prices (per MW-hr) | $ / MWh | 34.65
NI HUB |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 3,170,648
Receive average prices (per MW-hr) | $ / MWh | 25.13
ERCORT North HUB |
Derivative [Line Items] |
Notional quantity (MW-hrs) | MWh | 2,469,582
Receive average prices (per MW-hr) | $ / MWh | 36.46

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