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Electric Operating Revenues - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
utility
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
utility
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Disaggregation of Revenue [Line Items]          
Number of regulated utilities | utility 2   2    
Accounts receivable, allowance for credit loss, period increase $ (800,000) $ 500,000 $ (2,400,000) $ 2,900,000  
Other receivables, allowance for credit loss, period increase 0 $ 800,000 0 $ 800,000  
Contract assets 9,100,000   9,100,000   $ 600,000
Texas-New Mexico Power Company          
Disaggregation of Revenue [Line Items]          
Regulatory assets 800,000   800,000   800,000
PNM          
Disaggregation of Revenue [Line Items]          
Accounts receivable $ 115,600,000   $ 115,600,000   $ 86,800,000