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Capitalization (Tables)
9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Schedule of Carrying Amount and Fair Value of First Mortgage Bonds (FMBs) The carrying amount and fair value of the FMBs were as follows:
(Thousands of Dollars)
September 30, 2025December 31, 2024
Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
FMBs$126,172 $125,545 $129,602 $125,067