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Regulatory and Rate Matters - PNM (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 01, 2021
USD ($)
Apr. 15, 2021
USD ($)
GWh
Jan. 29, 2021
Jan. 01, 2021
USD ($)
Apr. 15, 2020
USD ($)
MMBTU
meter
Jun. 30, 2021
USD ($)
MW
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
MW
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
GWh
Jul. 29, 2020
MW
Public Utilities, Commitments And Contingencies [Line Items]                      
Excess return on jurisdictional equity that would require refund           0.50%   0.50%      
PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Solar generation capacity (in megawatts) | MW                     650
Renewable Portfolio Standard | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Number of megawatts of Solar PV facilities | MW           158   158      
Current output in the geothermal facility (in megawatts) | MW           11   11      
Solar generation capacity (in megawatts) | MW           180.2   180.2      
Energy Efficiency and Load Management Program | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU         80            
Program costs related to energy efficiency, in year two         $ 31,400,000            
Program costs related to energy efficiency, in year three         31,000,000.0            
Program costs related to energy efficiency, in year four         $ 29,600,000            
Number of AMI meters to be installed | meter         5,000            
Program costs related to meter installation         $ 2,900,000            
Integrated Resource Plan, 2011 | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Frequency of IRP filings               3 years      
Planning period covered of IRP               20 years      
Integrated Resource Plan, 2020 | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Planning period covered of IRP     20 years                
NMPRC                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Action plan, covered period               4 years      
NMPRC | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Proposed revision to rider that will allow for recovery $ 66,900,000     $ 67,800,000              
NMPRC | Renewable Energy Rider | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Renewable energy procurement plan, approved recovery, amount       65,500,000              
Recorded revenues from renewable rider           $ 15,500,000 $ 15,200,000 $ 31,400,000 $ 30,300,000    
NMPRC | Renewable Energy Rider, Sky Blue Energy Program | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Proposed revision to rider that will allow for recovery       $ 2,300,000              
Maximum | Renewable Portfolio Standard | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Reasonable cost threshold in megawatts per hour           $ 60   $ 60      
Minimum | Renewable Portfolio Standard | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Profit incentive sliding scale multiplier         0.071         0.071  
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU         80            
New Mexico Wind | Renewable Portfolio Standard 2014 | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Number of megawatts for wind energy | MW               200      
Red Mesa Wind | Renewable Portfolio Standard 2014 | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Number of megawatts for wind energy | MW               102      
La Joya Wind | Renewable Portfolio Standard | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Number of megawatts for wind energy | MW               140      
Disincentives and Incentives Added | 2017 Energy Efficiency and Load Management Program | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Energy efficiency and load management programs profit incentive, minimum                   $ 1,800,000  
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | GWh                   59  
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh                   68  
Disincentives and Incentives Added | 2020 Energy Efficiency Annual Report | PNM                      
Public Utilities, Commitments And Contingencies [Line Items]                      
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh   87                  
Energy efficiency and load management programs   $ 800,000