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Risk Management Activities - Outstanding commodity derivative instruments designated as hedging instruments (Details) - Commodity risk management | Dec. 31, 2021 MWh t | Dec. 31, 2020 MWh t
--- | --- | ---
Electricity | Cash flow hedges |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 0 | 95,000
Notional amount purchased | 0 | 0
Electricity | Non-Hedges |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 46,139,000 | 12,944,000
Notional amount purchased | 14,951,000 | 8,258,000
Emissions | Non-Hedges |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount sold | 445,000 | 1,831,000
Notional amount purchased | 2,030,000 | 2,112,000
Notional amount purchased | t | 350,000 | 2,365,000
Notional amount sold | t | 350,000 | 2,160,000
Coal | Non-Hedges |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount purchased | t | 9,352,000 | 9,078,000
Notional amount sold | t | 0 | 0

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- Details
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