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Equity Method Investment - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
MW
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Facility
MW
Business Acquisition [Line Items]        
Plant in service, held for future use, and to be abandoned | $ $ 8,480,799 $ 7,918,601    
PNMR Development        
Business Acquisition [Line Items]        
Solar distributed generation (in mw)   130    
NMRD        
Business Acquisition [Line Items]        
Solar distributed generation (in mw)       30
Plant in service, held for future use, and to be abandoned | $       $ 12,400
Renewable energy capacity in operating (in mw)       135.1
Megawatts supplying energy to data center (in mw)       130
Megawatts supplying energy to cooperative (in mw)       1.9
Megawatts supplying energy to power city (in mw)       1.2
NMRD | PNMR Development        
Business Acquisition [Line Items]        
Ownership percentage 50.00%      
Number of solar facilities | Facility       3
Solar distributed generation (in mw)       10
Plant in service, held for future use, and to be abandoned | $       $ 24,800
Cash contribution percentage       50.00%
Contribution to construction activities | $ $ 23,300 $ 38,300 $ 9,000  
NMRD | Central New Mexico Electric Cooperative        
Business Acquisition [Line Items]        
Megawatts supplying energy to cooperative (in mw)       2.0