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DERIVATIVE FINANCIAL INSTRUMENTS: Derivative Instruments, Notional Amounts (Details) (Details) MWh in Thousands, MMBTU in Thousands | Dec. 31, 2023 MWh MMBTU | Dec. 31, 2022 MWh MMBTU
--- | --- | ---
Electricity (MWh) | Long |  |
Derivative |  |
Derivative, Nonmonetary Notional Amount | MWh | 440 | 898
Electricity (MWh) | Short |  |
Derivative |  |
Derivative, Nonmonetary Notional Amount | MWh | 57 | 32
Natural Gas (MMBTU) | Long |  |
Derivative |  |
Derivative, Nonmonetary Notional Amount | MMBTU | 24,593 | 26,773
Natural Gas (MMBTU) | Short |  |
Derivative |  |
Derivative, Nonmonetary Notional Amount | MMBTU | 0 | 310

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