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Fair Value of Derivative and Other Financial Instruments - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 18, 2022
MW
Feb. 17, 2022
MW
Jun. 30, 2022
USD ($)
MW
Jun. 30, 2022
USD ($)
MW
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
MW
Dec. 31, 2021
USD ($)
power_purchase_agreement
MW
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
MW
power_purchase_agreement
May 31, 2022
MW
Jan. 01, 2018
MW
Debt Securities, Available-for-sale [Line Items]                      
Number of purchase power agreements | power_purchase_agreement             3        
Number of purchase power agreements, non derivatives | power_purchase_agreement                 2    
Obligations to return cash     $ 900,000 $ 900,000   $ 900,000 $ 900,000   $ 900,000    
PNM                      
Debt Securities, Available-for-sale [Line Items]                      
Number of purchase power agreements | power_purchase_agreement                 3    
Number of megawatts available in purchase power agreement (in megawatts) | MW 65 327 35                
Expected exposure to market risk (in megawatts) | MW     36 36   36       50 65
Amounts recognized for right to reclaim cash     $ 0 $ 0   $ 0 0   $ 0    
Cash collateral under margin arrangements     500,000 500,000   500,000 500,000   500,000    
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings       (12,700,000) $ 1,700,000 (21,600,000)   $ 600,000      
PNM | Commodity derivatives | Designated as Hedging Instrument                      
Debt Securities, Available-for-sale [Line Items]                      
Derivative asset, gross asset             500,000   500,000    
Other current assets     0 0   0 684,000   684,000    
Current derivative liability     3,154,000 3,154,000   3,154,000 $ 2,275,000   $ 2,275,000    
Total gain       100,000 $ 100,000 100,000   $ 100,000      
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 Three                      
Debt Securities, Available-for-sale [Line Items]                      
Number of megawatts available in purchase power agreement (in megawatts) | MW             40   40    
PNM | Portfolio Two                      
Debt Securities, Available-for-sale [Line Items]                      
Number of megawatts available in purchase power agreement (in megawatts) | MW             150   150    
PNM | Fuel and purchased power costs | Commodity derivatives | Designated as Hedging Instrument                      
Debt Securities, Available-for-sale [Line Items]                      
Other current assets     0 0   0 $ 200,000   $ 200,000    
Current derivative liability     $ 3,200,000 $ 3,200,000   $ 3,200,000 1,800,000   1,800,000    
PNM | Tri-State                      
Debt Securities, Available-for-sale [Line Items]                      
Power to be sold to third party (in megawatts) | MW     100 100   100          
PNM | Recurring                      
Debt Securities, Available-for-sale [Line Items]                      
Available-for-sale debt securities     $ 386,355,000 $ 386,355,000   $ 386,355,000 463,126,000   463,126,000    
Nuclear Decommissioning Trust | PNM | Recurring                      
Debt Securities, Available-for-sale [Line Items]                      
Available-for-sale debt securities     321,100,000 321,100,000   321,100,000 394,500,000   394,500,000    
Mine Reclamation Trust | PNM | Recurring                      
Debt Securities, Available-for-sale [Line Items]                      
Available-for-sale debt securities     $ 65,300,000 $ 65,300,000   $ 65,300,000 $ 68,600,000   $ 68,600,000