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Regulatory and Rate Matters - TNMP Narrative (Details) - USD ($)
$ in Millions
Jul. 21, 2023
May 26, 2023
Sep. 24, 2022
May 27, 2022
Mar. 01, 2022
Subsequent event          
Public Utilities, Commitments And Contingencies [Line Items]          
Requested total rate base $ 21.4        
Requested total rate base, annual $ 4.2        
TNMP          
Public Utilities, Commitments And Contingencies [Line Items]          
Energy efficiency cost recovery, requested change amount   $ 6.6   $ 1.9 $ 7.2
Energy efficiency cost recovery, requested bonus   $ 1.2   $ 7.4 $ 2.3
Energy efficiency cost recovery factor, approved settlement amount     $ 7.3    
Energy efficiency cost recovery factor, approved performance bonus     $ 1.9