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Regulation Narrative - New Mexico (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 06, 2019
USD ($)
Feb. 13, 2019
May 01, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
Dec. 31, 2019
USD ($)
Nov. 20, 2019
MW
Nov. 18, 2019
MW
NMPRC                
Public Utilities, General Disclosures [Line Items]                
Period to file application with regulatory agency       3 months        
Fuel Reconciliation Period       39 months        
Reconcilable Fuel Expense | $       $ 116.6        
Deferred Fuel Costs Over Collected | $       $ (0.8)        
Renewable portfolio standard requirement, percentage of retail sales       80.00%        
Long-term Contracts for Purchase of Electric Power, number               3
Regulatory asset for uncollectible arrearages during emergency conditions, period to accrue         9 months 21 days      
NMPRC | Maximum                
Public Utilities, General Disclosures [Line Items]                
Period to file application with regulatory agency       4 years        
NMPRC | Solar Plant at Santa Teresa, NM                
Public Utilities, General Disclosures [Line Items]                
Electric capacity, requested               100
NMPRC | Solar Plant at Otero County, NM                
Public Utilities, General Disclosures [Line Items]                
Electric capacity, requested               100
NMPRC | Battery Storage at Otero County, NM                
Public Utilities, General Disclosures [Line Items]                
Electric capacity, requested               50
NMPRC | Battery Storage at Canutillo, NM                
Public Utilities, General Disclosures [Line Items]                
Electric capacity, requested               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%        
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. 17-00090-UT | NMPRC                
Public Utilities, General Disclosures [Line Items]                
Deferred Fuel Costs Over Collected | $       $ (2.5)        
NMPRC Case No. 19-00350-UT | Solar Plant at NMSU                
Public Utilities, General Disclosures [Line Items]                
Electric capacity, requested             3  
NMPRC Case No. 19-00350-UT | Battery Storage at NMSU                
Public Utilities, General Disclosures [Line Items]                
Electric Capacity             1  
NMPRC Case No. 18-00116-UT                
Public Utilities, General Disclosures [Line Items]                
Public Utilities Approved 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, Percentage of Expenditures 7.10%              
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program | $ $ 0.4              
NMPRC Case No. 19-00349-UT | Newman Power Station                
Public Utilities, General Disclosures [Line Items]                
Electric capacity, requested               228