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Regulatory and Rate Matters - Renewable Portfolio Standard (Details)
 12 Months Ended
Jan. 01, 2021
USD ($)
Nov. 18, 2020
Jun. 01, 2020
USD ($)
Jun. 03, 2019
MW
Dec. 31, 2020
USD ($)
MW
Mar. 27, 2020
MW
Aug. 10, 2018
kv
Jun. 01, 2017
GWh
MW
KV Transmission Line                
Public Utilities, General Disclosures [Line Items]                
Transmission line and associated facilities | kv             345  
Public Service Company of New Mexico                
Public Utilities, General Disclosures [Line Items]                
Solar distributed generation (in mw)           300    
Public Service Company of New Mexico | Renewable Portfolio Standard                
Public Utilities, General Disclosures [Line Items]                
Solar photovoltaic capacity (in mw)         158      
Solar distributed generation (in mw)         161.0      
Public Service Company of New Mexico | Renewable Portfolio Standard | Maximum                
Public Utilities, General Disclosures [Line Items]                
Reasonable cost threshold in megawatts per hour | $         $ 60      
NMPRC | Public Service Company of New Mexico                
Public Utilities, General Disclosures [Line Items]                
Additional megawatt hours in first year (in mw) | GWh               80
Requested solar production (in mw)               50
NMPRC | Public Service Company of New Mexico | Renewable Energy Rider                
Public Utilities, General Disclosures [Line Items]                
Proposed revision to rider that will allow for recovery | $     $ 67,800,000          
NMPRC | Public Service Company of New Mexico | Renewable Energy Rider | Subsequent Event                
Public Utilities, General Disclosures [Line Items]                
Proposed revision to rider that will allow for recovery | $ $ 67,800,000              
NMPRC | Public Service Company of New Mexico | Renewable Energy Rider, Sky Blue Energy Program                
Public Utilities, General Disclosures [Line Items]                
Proposed revision to rider that will allow for recovery | $     $ 2,300,000          
Renewable energy procurement plan, carrying charges, percent   4.00% 8.64%          
Renewable energy procurement plan, carrying charges | $     $ 700,000          
NMPRC | Public Service Company of New Mexico | Renewable Energy Rider, Sky Blue Energy Program | Subsequent Event                
Public Utilities, General Disclosures [Line Items]                
Proposed revision to rider that will allow for recovery | $ $ 2,300,000              
New Mexico Wind | Public Service Company of New Mexico | Renewable Portfolio Standard 2014                
Public Utilities, General Disclosures [Line Items]                
Wind energy capacity (in mw)         200      
New Mexico Wind | NMPRC | Public Service Company of New Mexico                
Public Utilities, General Disclosures [Line Items]                
Additional megawatt hours in second year (in mw) | GWh               105
Red Mesa Wind | Public Service Company of New Mexico | Renewable Portfolio Standard 2014                
Public Utilities, General Disclosures [Line Items]                
Wind energy capacity (in mw)         102      
La Joya Wind | Public Service Company of New Mexico | Renewable Portfolio Standard                
Public Utilities, General Disclosures [Line Items]                
Wind energy capacity (in mw)         140      
Solar distributed generation (in mw)       140        
PPA term       20 years        
Lightning Dock Geothermal | Public Service Company of New Mexico | Renewable Portfolio Standard                
Public Utilities, General Disclosures [Line Items]                
Geothermal energy capacity (in mw)         11      
Lightning Dock Geothermal | NMPRC | Public Service Company of New Mexico                
Public Utilities, General Disclosures [Line Items]                
Additional megawatt hours in first year (in mw) | GWh               55
Additional megawatt hours in second year (in mw) | GWh               77