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Regulation Regulation Narrative - New Mexico (Details)
$ in Thousands
12 Months Ended
Nov. 26, 2019
Mar. 06, 2019
USD ($)
Feb. 13, 2019
Jan. 30, 2019
USD ($)
Nov. 16, 2018
May 01, 2018
USD ($)
Jul. 01, 2016
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 20, 2019
MW
Nov. 18, 2019
MW
May 22, 2019
USD ($)
Apr. 01, 2019
USD ($)
Feb. 01, 2019
USD ($)
Sep. 13, 2018
USD ($)
Jun. 28, 2018
USD ($)
Oct. 04, 2017
USD ($)
Oct. 07, 2015
USD ($)
MW
Senior Notes | 4.22% Senior Notes, due 2028                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Face Amount                                 $ 125,000    
Debt Instrument, Interest Rate, Stated Percentage               4.22% 4.22%               4.22%    
NMPRC                                      
Public Utilities, General Disclosures [Line Items]                                      
Period to file fuel factor continuation               3 months                      
Fuel Reconciliation Period               36 months                      
Reconcilable Fuel Expense               $ 112,400                      
Deferred Fuel Cost               $ 300                      
Renewable portfolio standard requirement, percentage of retail sales               80.00%                      
Long-term Contracts for Purchase of Electric Power, number                       3              
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program               $ 400   $ 700                  
Line of Credit Facility, Current Borrowing Capacity                               $ 350,000      
NMPRC | 7.25% 2009 Series A Refunding Bonds, due 2040                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Interest Rate, Stated Percentage                         3.60%            
NMPRC | 7.25% 2009 Series B Refunding Bonds, due 2040                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Interest Rate, Stated Percentage                         3.60%            
NMPRC | Maximum                                      
Public Utilities, General Disclosures [Line Items]                                      
Period to file fuel factor continuation               4 years                      
NMPRC | Solar Plant at Santa Teresa, NM                                      
Public Utilities, General Disclosures [Line Items]                                      
Electric capacity, requested | MW                       100              
NMPRC | Solar Plant at Otero County, NM                                      
Public Utilities, General Disclosures [Line Items]                                      
Electric capacity, requested | MW                       100              
NMPRC | Battery Storage at Otero County, NM                                      
Public Utilities, General Disclosures [Line Items]                                      
Electric capacity, requested | MW                       50              
NMPRC | Battery Storage at Canutillo, NM                                      
Public Utilities, General Disclosures [Line Items]                                      
Electric capacity, requested | MW                       50              
NMPRC | 2020                                      
Public Utilities, General Disclosures [Line Items]                                      
Renewable portfolio standard requirement, percentage of retail sales               20.00%                      
NMPRC | 2025                                      
Public Utilities, General Disclosures [Line Items]                                      
Renewable portfolio standard requirement, percentage of retail sales               40.00%                      
NMPRC | 2030                                      
Public Utilities, General Disclosures [Line Items]                                      
Renewable portfolio standard requirement, percentage of retail sales               50.00%                      
NMPRC | 2040                                      
Public Utilities, General Disclosures [Line Items]                                      
Renewable portfolio standard requirement, percentage of retail sales               80.00%                      
PUCT Docket No. 50292                                      
Public Utilities, General Disclosures [Line Items]                                      
Fuel Reconciliation Period 7 months                                    
Deferred fuel costs over-collected, including interest, period 12 months                                    
NMPRC Case No. 18-00006-UT                                      
Public Utilities, General Disclosures [Line Items]                                      
Fuel Reconciliation Period     24 months                                
NMPRC Case No. 18-00016-UT                                      
Public Utilities, General Disclosures [Line Items]                                      
Public Utilities, Approved Rate Increase (Decrease), Amount           $ (4,900)                          
NMPRC Case No. 19-00033-UT | Maximum                                      
Public Utilities, General Disclosures [Line Items]                                      
Proceeds from issuance of common stock, requested       $ 200,000                              
NMPRC Case No. 17-00090-UT | NMPRC                                      
Public Utilities, General Disclosures [Line Items]                                      
Deferred Fuel Costs Over Collected               $ 2,200                      
NMPRC Case No. 15-00185-UT | Holloman                                      
Public Utilities, General Disclosures [Line Items]                                      
Electric Capacity | MW                                     5
NMPRC Case No. 16-00185-UT | 2017 Energy Efficiency Programs                                      
Public Utilities, General Disclosures [Line Items]                                      
Public Utilities Requested Performance Incentive Bonus Related To Energy Efficiency Program             $ 400                        
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program                 $ 300                    
NMPRC Case No. 19-00350-UT | Solar Plant at NMSU                                      
Public Utilities, General Disclosures [Line Items]                                      
Electric capacity, requested | MW                     3                
NMPRC Case No. 19-00350-UT | Battery Storage at NMSU                                      
Public Utilities, General Disclosures [Line Items]                                      
Electric Capacity | MW                     1                
NMPRC Case No. 18-00116-UT                                      
Public Utilities, General Disclosures [Line Items]                                      
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program               $ 400                      
NMPRC Case No. 18-00116-UT | 2019-2021 Energy Efficiency Programs                                      
Public Utilities, General Disclosures [Line Items]                                      
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program   $ 400                                  
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program, Percentage of Expenditures   7.10%                                  
NMPRC Case No. 18-00293-UT                                      
Public Utilities, General Disclosures [Line Items]                                      
Number of Regulatory Filing Deficiencies         12                            
NMPRC Case No. 15-00280-UT | Maximum | RGRT                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Face Amount                                     $ 65,000
NMPRC Case No. 15-00280-UT | Senior Notes | 4.07% RGRT Senior Notes, due 2025                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Face Amount                                 $ 65,000    
Debt Instrument, Interest Rate, Stated Percentage                                 4.07%    
NMPRC Case No. 17-00217-UT                                      
Public Utilities, General Disclosures [Line Items]                                      
Line of Credit Facility, Current Borrowing Capacity                                   $ 450,000  
NMPRC Case No. 17-00217-UT | 7.25% 2009 Series A Refunding Bonds, due 2040                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Face Amount                         $ 63,500         $ 63,500  
Debt Instrument, Interest Rate, Stated Percentage                             7.25%     7.25%  
Debt Instrument, Repurchased Face Amount                             $ 63,500        
NMPRC Case No. 17-00217-UT | 7.25% 2009 Series B Refunding Bonds, due 2040                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Face Amount                         $ 37,100         $ 37,100  
Debt Instrument, Interest Rate, Stated Percentage                           7.25%       7.25%  
Debt Instrument, Repurchased Face Amount                           $ 37,100          
NMPRC Case No. 17-00217-UT | Maximum | Long-term Debt                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Face Amount                                   $ 350,000  
NMPRC Case No. 17-00217-UT | Senior Notes | 4.22% Senior Notes, due 2028                                      
Public Utilities, General Disclosures [Line Items]                                      
Debt Instrument, Face Amount                                 $ 125,000    
Debt Instrument, Interest Rate, Stated Percentage                                 4.22%    
NMPRC Case No. 19-00349-UT | Newman Power Station                                      
Public Utilities, General Disclosures [Line Items]                                      
Electric capacity, requested | MW                       228