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Variable Interest Entities - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
MW
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 05, 2022
MW
Jan. 31, 2016
USD ($)
Coal Supply | San Juan Generating Station          
Variable Interest Entity [Line Items]          
Issuance in letters of credit         $ 30.3
PNM          
Variable Interest Entity [Line Items]          
Number of megawatts purchased (in megawatts) | MW       64.1  
PNM | Valencia          
Variable Interest Entity [Line Items]          
Payment for fixed charges $ 20.5 $ 20.3 $ 19.5    
Payment for variable charges $ 2.4 $ 5.2 $ 1.9    
Option to purchase a percentage of the plant or VIE (up to ) 50.00%        
Purchase price, percentage of the book value reduced by related indebtedness 50.00%        
Purchase price, percentage of fair market value 50.00%        
PNM | Valencia | Purchased Through May 30, 2028          
Variable Interest Entity [Line Items]          
Number of megawatts purchased (in megawatts) | MW 155