Derivative financial instruments - Power Purchase Agreements - Key assumptions (Details) - Power Purchase Agreement [Member] - Discounted cash flow [member] |
Dec. 31, 2025
$ / MWh
|
|---|---|
| Energy Price [Member] | Minimum | |
| Disclosure of detailed information about hedging instruments [line items] | |
| Significant Unobservable Inputs Derivative Financial Instruments | 63 |
| Energy Price [Member] | Maximum | |
| Disclosure of detailed information about hedging instruments [line items] | |
| Significant Unobservable Inputs Derivative Financial Instruments | 72 |
| Cap Volatility [Member] | |
| Disclosure of detailed information about hedging instruments [line items] | |
| Significant Unobservable Inputs Derivative Financial Instruments | 0.254 |