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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