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Regulatory and Rate Matters - Renewable Portfolio Standard (Details)
12 Months Ended
Jun. 03, 2019
MW
Dec. 31, 2019
USD ($)
MW
Jun. 14, 2019
May 01, 2019
kv
Aug. 10, 2018
kv
MW
Jun. 01, 2017
GWh
MW
KV Transmission Line            
Public Utilities, General Disclosures [Line Items]            
Solar distributed generation (in mw) 140       166  
PPA term 20 years          
Transmission line and associated facilities | kv       345 345  
Public Service Company of New Mexico | Renewable Portfolio Standard            
Public Utilities, General Disclosures [Line Items]            
Solar photovoltaic capacity (in mw)   157        
Current output of solar photovoltaic capacity (in mw)   15        
Solar distributed generation (in mw)   127.6        
Requested solar production (in mw)   50        
Public Service Company of New Mexico | Renewable Portfolio Standard | Maximum            
Public Utilities, General Disclosures [Line Items]            
Reasonable cost threshold in megawatts per hour | $   $ 60        
Public Service Company of New Mexico | Renewable Portfolio Standard | Required Percentage by 2011            
Public Utilities, General Disclosures [Line Items]            
Required percentage of renewable energy in portfolio to electric sales   10.00%        
Public Service Company of New Mexico | Renewable Portfolio Standard | Required Percentage by 2015            
Public Utilities, General Disclosures [Line Items]            
Required percentage of renewable energy in portfolio to electric sales   15.00%        
Public Service Company of New Mexico | Renewable Portfolio Standard | Required Percentage by 2020            
Public Utilities, General Disclosures [Line Items]            
Required percentage of renewable energy in portfolio to electric sales   20.00%        
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
New Mexico Wind | Public Service Company of New Mexico | Renewable Portfolio Standard 2014            
Public Utilities, General Disclosures [Line Items]            
Wind energy capacity (in mw)   204        
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        
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
La Joya Wind | KV Transmission Line            
Public Utilities, General Disclosures [Line Items]            
Solar distributed generation (in mw)         140  
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2020            
Public Utilities, General Disclosures [Line Items]            
Renewable energy, percentage     0.20      
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2025            
Public Utilities, General Disclosures [Line Items]            
Renewable energy, percentage     0.40      
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2030            
Public Utilities, General Disclosures [Line Items]            
Renewable energy, percentage     0.50      
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2040            
Public Utilities, General Disclosures [Line Items]            
Renewable energy, percentage     0.80      
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2045            
Public Utilities, General Disclosures [Line Items]            
Renewable energy, percentage     1