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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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