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Regulatory and Rate Matters - New Mexico General Rate Cases (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 01, 2018
Jan. 10, 2018
USD ($)
Sep. 28, 2016
USD ($)
Aug. 31, 2016
USD ($)
lease
MW
Jan. 31, 2016
USD ($)
lease
MW
Mar. 31, 2021
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
MW
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
May 16, 2019
MW
Sep. 30, 2016
MW
Public Utilities, General Disclosures [Line Items]                            
Income Taxes             $ 32,582 $ 20,636 $ (25,282)          
Regulatory disallowances and restructuring costs             1,194 1,098 151,095          
Percent of non-fuel revenue requirement change implemented 50.00%                          
NMPRC                            
Public Utilities, General Disclosures [Line Items]                            
Requested rate increase                     $ 99,200      
Requested return on equity                     10.125%      
Proposed term for providing benefits to customers related to reduction in state corporate tax           3 years       23 years        
Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Income Taxes             26,992 21,857 (25,962)          
Regulatory disallowances and restructuring costs             $ 1,194 $ 1,098 150,599          
Public Service Company of New Mexico | Palo Verde Nuclear Generating Station, Unit 2 Leases                            
Public Utilities, General Disclosures [Line Items]                            
Number of megawatts purchased (in megawatts) | MW       64.1 64.1                 64.1
Number of megawatts (in megawatts) | MW       114.6 114.6                 114.6
Number of leases under which assets were purchased | lease       3 3                  
Public Service Company of New Mexico | Palo Verde Nuclear Generating Station, Unit 1 Leases, extended                            
Public Utilities, General Disclosures [Line Items]                            
Estimated annual rent expense       $ 18,100                    
Public Service Company of New Mexico | NMPRC                            
Public Utilities, General Disclosures [Line Items]                            
Requested rate increase   $ 10,300                        
Requested return on equity   9.575%                        
Proposed term for providing benefits to customers related to reduction in state corporate tax   3 years                        
Public Service Company of New Mexico | 2015 Electric Rate Case                            
Public Utilities, General Disclosures [Line Items]                            
Requested rate increase                       $ 123,500    
Approved rate increase (decrease)     $ 61,200                      
Public Service Company of New Mexico | 2015 Electric Rate Case | Palo Verde Nuclear Generating Station, Unit 2 Leases                            
Public Utilities, General Disclosures [Line Items]                            
Proposed disallowance of recovery of purchase price of assets       $ 163,300                    
Approved lease acquisition costs         $ 83,700                  
Disallowed leasehold improvements         $ 43,800                  
Public Service Company of New Mexico | 2015 Electric Rate Case | Non-Fuel Energy                            
Public Utilities, General Disclosures [Line Items]                            
Requested rate increase                       $ 121,700    
Four Corners                            
Public Utilities, General Disclosures [Line Items]                            
Regulatory disallowances and restructuring costs   $ 47,600                        
Pre-tax regulatory disallowance   $ 148,100                        
Palo Verde Nuclear Generating Station, Unit 2 | Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Number of megawatts purchased (in megawatts) | MW       64.1                    
Number of megawatts (in megawatts) | MW       114.6                 114.6  
Palo Verde Nuclear Generating Station, Unit 2 | Public Service Company of New Mexico | 2015 Electric Rate Case                            
Public Utilities, General Disclosures [Line Items]                            
Number of megawatts purchased (in megawatts) | MW                         64.1  
New Mexico 2015 Rate Case | Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Recorded pre-tax impairments                 150,600          
Amount of impairment to carrying amount of regulatory assets                 39,700          
Income Taxes                 $ (45,700)          
New Mexico 2015 Rate Case | Palo Verde Nuclear Generating Station, Unit 2 | Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Number of megawatts purchased (in megawatts) | MW                 64.1          
Recorded pre-tax impairments portion of purchase price                 $ 73,200          
Income Taxes                 45,700          
Leaseholds and Leasehold Improvements | New Mexico 2015 Rate Case | Palo Verde Nuclear Generating Station, Units 1 And 4 | Public Service Company of New Mexico                            
Public Utilities, General Disclosures [Line Items]                            
Amount of impairment to carrying amount of regulatory assets                 $ 37,700