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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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