XML 84 R62.htm IDEA: XBRL DOCUMENT v3.21.1
Regulatory and Rate Matters - PNM (Details)
 3 Months Ended 12 Months Ended
Apr. 15, 2021
USD ($)
GWh
Jan. 29, 2021
Jan. 01, 2021
USD ($)
Apr. 15, 2020
USD ($)
MMBTU
meter
Mar. 31, 2021
USD ($)
MW
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
GWh
Jul. 29, 2020
MW
Public Utilities, Commitments And Contingencies [Line Items]                
Excess return on jurisdictional equity that would require refund         0.50%      
PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Solar generation capacity (in megawatts) | MW               650
Renewable Portfolio Standard | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Number of megawatts of Solar PV facilities | MW         158      
Current output in the geothermal facility (in megawatts) | MW         11      
Solar generation capacity (in megawatts) | MW         169.5      
Energy Efficiency and Load Management Program | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU       80        
Program costs related to energy efficiency, in year two       $ 31,400,000        
Program costs related to energy efficiency, in year three       31,000,000.0        
Program costs related to energy efficiency, in year four       $ 29,600,000        
Number of AMI meters to be installed | meter       5,000        
Program costs related to meter installation       $ 2,900,000        
Integrated Resource Plan, 2011 | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Frequency of IRP filings         3 years      
Planning period covered of IRP         20 years      
Integrated Resource Plan, 2020 | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Planning period covered of IRP   20 years            
NMPRC                
Public Utilities, Commitments And Contingencies [Line Items]                
Action plan, covered period         4 years      
NMPRC | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Proposed revision to rider that will allow for recovery     $ 67,800,000          
NMPRC | Renewable Energy Rider | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Renewable energy procurement plan, approved recovery, amount     65,500,000          
Recorded revenues from renewable rider         $ 15,900,000 $ 15,100,000    
NMPRC | Renewable Energy Rider, Sky Blue Energy Program | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Proposed revision to rider that will allow for recovery     $ 2,300,000          
Maximum | Renewable Portfolio Standard | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Reasonable cost threshold in megawatts per hour         $ 60      
Minimum | Renewable Portfolio Standard | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Profit incentive sliding scale multiplier       0.071     0.071  
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU       80        
New Mexico Wind | Renewable Portfolio Standard 2014 | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Number of megawatts for wind energy | MW         200      
Red Mesa Wind | Renewable Portfolio Standard 2014 | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Number of megawatts for wind energy | MW         102      
La Joya Wind | Renewable Portfolio Standard | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Number of megawatts for wind energy | MW         140      
Disincentives and Incentives Added | 2017 Energy Efficiency and Load Management Program | PNM                
Public Utilities, Commitments And Contingencies [Line Items]                
Energy efficiency and load management programs profit incentive, minimum             $ 1,800,000  
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | GWh             59  
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh             68  
Disincentives and Incentives Added | 2020 Energy Efficiency Annual Report | PNM | Subsequent event                
Public Utilities, Commitments And Contingencies [Line Items]                
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh 87              
Energy efficiency and load management programs $ 800,000