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Regulatory and Rate Matters (Tables)
 9 Months Ended
Sep. 30, 2025
Regulated Operations [Abstract]  
Schedule of Rate Increases for Transmission Costs
The following sets forth TNMP’s recent interim transmission cost rate increases:

Effective DateApproved Increase in Rate BaseAnnual Increase in Revenue
(In millions)
March 15, 2024$97.4 $13.1 
September 20, 202420.6 3.9 
March 25, 202583.5 11.5 
September 19, 202587.4 12.3 
Schedule Of Interim Distribution Rate Increases The following sets forth TNMP’s recent interim distribution rate increases:
Effective DateApproved Increase in Rate BaseAnnual Increase in Revenue
(In millions)
September 1, 2023$157.0 $14.5 
July 28, 2024205.9 15.6 
November 17, 202443.7 7.7 
June 29, 2025176.6 25.0