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Regulation Narrative - New Mexico (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 06, 2019
USD ($)
Feb. 13, 2019
Jan. 30, 2019
USD ($)
Nov. 16, 2018
May 01, 2018
USD ($)
Jul. 01, 2016
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 22, 2019
USD ($)
Apr. 01, 2019
USD ($)
Feb. 01, 2019
USD ($)
Sep. 13, 2018
USD ($)
Jun. 28, 2018
USD ($)
Apr. 24, 2018
MW
Oct. 04, 2017
USD ($)
Oct. 07, 2015
USD ($)
MW
Public Utilities, General Disclosures [Line Items]                                    
Line of Credit Facility, Current Borrowing Capacity             $ 350.0 $ 350.0                    
7.25% 2009 Series A Refunding Bonds, due 2040                                    
Public Utilities, General Disclosures [Line Items]                                    
Debt Instrument, Interest Rate, Stated Percentage                     3.60%              
7.25% 2009 Series B Refunding Bonds, due 2040                                    
Public Utilities, General Disclosures [Line Items]                                    
Debt Instrument, Interest Rate, Stated Percentage                     3.60%              
NMPRC                                    
Public Utilities, General Disclosures [Line Items]                                    
Period to file fuel factor continuation               3 months                    
Fuel Reconciliation Period               33 months                    
Reconcilable Fuel Expense             107.3 $ 107.3                    
Deferred Fuel Cost             1.4 $ 1.4                    
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program             0.4   $ 0.3 $ 0.7                
Line of Credit Facility, Current Borrowing Capacity                           $ 350.0        
Renewable portfolio standard requirement, percentage of retail sales               80.00%                    
Reasonable cost threshold, percentage               3.00%                    
NMPRC | Maximum                                    
Public Utilities, General Disclosures [Line Items]                                    
Period to file fuel factor continuation               4 years                    
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%                    
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         $ (4.9)                          
NMPRC Case No. 19-00033-UT | Maximum                                    
Public Utilities, General Disclosures [Line Items]                                    
Proceeds from issuance of common stock, requested     $ 200.0                              
NMPRC Case No. 17-00090-UT | NMPRC                                    
Public Utilities, General Disclosures [Line Items]                                    
Deferred Fuel Costs Over Collected             $ (1.6) $ (1.6)                    
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           $ 0.4                        
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 $ 0.4                                  
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program, Percentage of Expenditures 7.10%                                  
NMPRC Case No. 18-00099-UT | Community Solar at Doña Ana County                                    
Public Utilities, General Disclosures [Line Items]                                    
Electric capacity, requested | MW                               2    
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                                   $ 65.0
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                             $ 65.0      
Debt Instrument, Interest Rate, Stated Percentage                             4.07%      
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                     $ 63.5           $ 63.5  
Debt Instrument, Interest Rate, Stated Percentage                         7.25%       7.25%  
Debt Instrument, Repurchased Face Amount                         $ 63.5          
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                     $ 37.1           $ 37.1  
Debt Instrument, Interest Rate, Stated Percentage                       7.25%         7.25%  
Debt Instrument, Repurchased Face Amount                       $ 37.1            
NMPRC Case No. 17-00217-UT | Maximum | Long-term Debt                                    
Public Utilities, General Disclosures [Line Items]                                    
Debt Instrument, Face Amount                                 $ 350.0  
NMPRC Case No. 17-00217-UT | Senior Notes | 4.22% Senior Notes, due 2028                                    
Public Utilities, General Disclosures [Line Items]                                    
Debt Instrument, Face Amount                             $ 125.0      
Debt Instrument, Interest Rate, Stated Percentage                             4.22%