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Regulatory and Rate Matters - FERC Order 864 (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]      
Revenues $ (1,971,199) $ (1,939,198) $ (2,249,555)
Interest income 23,537 21,963 16,095
Other current liabilities 84,998 94,397  
PNM      
Public Utilities, General Disclosures [Line Items]      
Revenues (1,379,088) (1,403,948) (1,766,825)
Interest income 23,454 21,355 $ 14,816
Other current liabilities $ 50,099 52,587  
FERC Order 864 | PNM      
Public Utilities, General Disclosures [Line Items]      
Revenues   3,200  
Interest income   300  
Other current liabilities   $ 3,500