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Fair Value of Derivative and Other Financial Instruments - Narrative (Details)
 3 Months Ended 12 Months Ended
Nov. 15, 2015
power_purchase_agreement
Mar. 31, 2023
USD ($)
MW
Mar. 31, 2023
USD ($)
MW
Mar. 31, 2023
USD ($)
MW
MMBTU
Mar. 31, 2023
USD ($)
MW
MWh
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
MMBTU
Dec. 31, 2022
USD ($)
MWh
Dec. 31, 2021
power_purchase_agreement
MW
May 31, 2022
MW
Jan. 01, 2018
MW
Debt Securities, Available-for-sale [Line Items]                      
Number of purchase power agreements, non derivatives | power_purchase_agreement                 2    
Obligations to return cash             $ 200,000 $ 200,000      
PNM                      
Debt Securities, Available-for-sale [Line Items]                      
Number of purchase power agreements | power_purchase_agreement 2               3    
Expected exposure to market risk (in megawatts) | MW   36 36 36 36         50 65
Amounts recognized for right to reclaim cash   $ 0 $ 0 $ 0 $ 0   0 0      
Cash collateral under margin arrangements   2,300,000 2,300,000 2,300,000 2,300,000   10,500,000 10,500,000      
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings     2,000,000     $ (8,900,000)          
PNM | Commodity derivatives | Designated as Hedging Instrument                      
Debt Securities, Available-for-sale [Line Items]                      
Other current assets   416,000 416,000 416,000 416,000   9,780,000 9,780,000      
Current derivative liability   $ 27,074,000 $ 27,074,000 $ 27,074,000 $ 27,074,000   $ 19,209,000 $ 19,209,000      
Economic Hedges (in mmbtu and mwh)       0 651,375   0 432,200      
PNM | Portfolio One                      
Debt Securities, Available-for-sale [Line Items]                      
Number of megawatts available in purchase power agreement (in megawatts) | MW   85             85    
PNM | Portfolio Two                      
Debt Securities, Available-for-sale [Line Items]                      
Number of megawatts available in purchase power agreement (in megawatts) | MW                 40    
Derivative, Nonmonetary Notional Amount | MW   375 375 375 375            
PNM | Portfolio Three                      
Debt Securities, Available-for-sale [Line Items]                      
Number of megawatts available in purchase power agreement (in megawatts) | MW                 150    
PNM | Fuel and purchased power costs | Commodity derivatives | Designated as Hedging Instrument                      
Debt Securities, Available-for-sale [Line Items]                      
Other current assets             $ 9,800,000 $ 9,800,000      
Current derivative liability             19,200,000 19,200,000      
PNM | Tri-State                      
Debt Securities, Available-for-sale [Line Items]                      
Power to be sold to third party (in megawatts) | MW                   100  
PNM | Recurring                      
Debt Securities, Available-for-sale [Line Items]                      
Available-for-sale debt securities   $ 431,328,000 $ 431,328,000 $ 431,328,000 $ 431,328,000   417,476,000 417,476,000      
Nuclear Decommissioning Trust | PNM | Recurring                      
Debt Securities, Available-for-sale [Line Items]                      
Available-for-sale debt securities   337,700,000 337,700,000 337,700,000 337,700,000   325,300,000 325,300,000      
SJGS Decommissioning Trust | PNM | Recurring                      
Debt Securities, Available-for-sale [Line Items]                      
Available-for-sale debt securities   14,800,000 14,800,000 14,800,000 14,800,000   14,700,000 14,700,000      
Mine Reclamation Trust | PNM | Recurring                      
Debt Securities, Available-for-sale [Line Items]                      
Available-for-sale debt securities   $ 78,800,000 $ 78,800,000 $ 78,800,000 $ 78,800,000   $ 77,500,000 $ 77,500,000