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Regulatory and Rate Matters - FERC Order 864 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Public Utilities, General Disclosures [Line Items]      
Other current liabilities $ 94,397 $ 87,037  
Revenues (1,939,198) (2,249,555) $ (1,779,873)
Interest income 21,963 16,095 14,662
PNM      
Public Utilities, General Disclosures [Line Items]      
Other current liabilities 52,587 55,350  
Revenues (1,403,948) (1,766,825) (1,362,020)
Interest income 21,355 $ 14,816 $ 14,605
FERC Order 864 | PNM      
Public Utilities, General Disclosures [Line Items]      
Other current liabilities 3,500    
Revenues 3,200    
Interest income $ 300