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DERIVATIVE FINANCIAL INSTRUMENTS: Derivative Instruments, Notional Amounts (Details) (Details) MWh in Thousands, MMBTU in Thousands | Dec. 31, 2025 MWh MMBTU | Dec. 31, 2024 MWh MMBTU
--- | --- | ---
Electricity (MWh) | Long |  |
Derivative |  |
Derivative, Nonmonetary Notional Amount | 200 | 161
Electricity (MWh) | Short |  |
Derivative |  |
Derivative, Nonmonetary Notional Amount | 33 | 16
Natural Gas (MMBTU) | Long |  |
Derivative |  |
Derivative, Nonmonetary Notional Amount | MMBTU | 131,863 | 88,330

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