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Regulatory and Rate Matters - FERC Order 864 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]          
Electric operating revenues $ 505,851 $ 729,888 $ 1,527,084 $ 1,673,736  
Other current liabilities 89,727   89,727   $ 87,037
FERC Order 864          
Public Utilities, General Disclosures [Line Items]          
Electric operating revenues (3,100)        
Other current liabilities 3,100   3,100    
Public Service Company of New Mexico          
Public Utilities, General Disclosures [Line Items]          
Electric operating revenues 350,334 $ 597,337 1,118,741 $ 1,312,800  
Other current liabilities 54,491   54,491   $ 55,350
Public Service Company of New Mexico | FERC Order 864          
Public Utilities, General Disclosures [Line Items]          
Electric operating revenues (3,100)        
Other current liabilities $ 3,100   $ 3,100