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Regulatory and Rate Matters - Schedule of Interim Distribution Rate Increases (Details) - Texas-New Mexico Power Company - Periodic Distribution Rate Adjustment - USD ($)
$ in Millions
Nov. 17, 2024
Jul. 28, 2024
Sep. 01, 2023
Sep. 01, 2022
Public Utilities, General Disclosures [Line Items]        
Approved Increase in Rate Base   $ 205.9 $ 157.0 $ 95.7
Annual Increase in Revenue   $ 15.6 $ 14.5 $ 6.8
Forecast        
Public Utilities, General Disclosures [Line Items]        
Approved Increase in Rate Base $ 43.7      
Annual Increase in Revenue $ 7.7