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Capitalization (Tables)
6 Months Ended
Jun. 30, 2025
Capitalization [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)
   June 30, 2025  December 31, 2024
   Carrying  Fair  Carrying  Fair
   Amount  Value  Amount  Value
FMBs  $128,857   $127,236   $129,602   $125,067