Fair Value of Financial Instruments and Risk Management - Volume of Derivative Activity (Details) |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2023
petajoule
GWh
|
Dec. 31, 2022
GWh
petajoule
|
|
| Electricity swap contracts | ||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Volume (gwh / pj) | GWh | 628 | 586 |
| Electricity power purchase contracts | ||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Volume (gwh / pj) | GWh | 588 | 224 |
| Gas swap contracts | ||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Volume (gwh / pj) | petajoule | 228 | 185 |
| Gas supply contracts | ||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Volume (gwh / pj) | petajoule | 134 | 148 |
| Wholesale trading contracts | ||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Volume (gwh / pj) | GWh | 1,310 | 1,886 |
| Gas swap contracts | ||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||
| Volume (gwh / pj) | petajoule | 3 | 34 |