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Regulatory and Rate Matters (Tables)
 6 Months Ended
Jun. 30, 2024
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)
May 12, 2023$150.5 $19.4 
September 6, 202321.4 4.2 
March 15, 202497.4 13.1 
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, 2022$95.7 $6.8 
September 1, 2023157.0 14.5 
July 28, 2024205.9 15.6