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Fair Value of Derivative and Other Financial Instruments - Narrative (Details)
3 Months Ended 6 Months Ended
Nov. 15, 2015
power_purchase_agreement
Jun. 30, 2023
USD ($)
MW
Jun. 30, 2022
USD ($)
Mar. 31, 2022
MW
power_purchase_agreement
Jun. 30, 2023
USD ($)
MW
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
May 31, 2022
MW
Jan. 01, 2018
MW
Debt Securities, Available-for-sale [Line Items]                  
Number of purchase power agreements, non derivatives | power_purchase_agreement       2          
Obligations to return cash             $ 200,000    
PNM                  
Debt Securities, Available-for-sale [Line Items]                  
Number of purchase power agreements | power_purchase_agreement 2     3          
Expected exposure to market risk (in megawatts) | MW   36     36     50 65
Amounts recognized for right to reclaim cash   $ 0     $ 0   0    
Cash collateral under margin arrangements   900,000     900,000   10,500,000    
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings   1,400,000 $ (12,700,000)   3,400,000 $ (21,600,000)      
PNM | Commodity derivatives | Designated as Hedging Instrument                  
Debt Securities, Available-for-sale [Line Items]                  
Other current assets   641,000     641,000   9,780,000    
Current derivative liability   $ 22,917,000     $ 22,917,000   19,209,000    
PNM | Portfolio One                  
Debt Securities, Available-for-sale [Line Items]                  
Number of megawatts available in purchase power agreement (in megawatts) | MW   85   85          
PNM | Portfolio Two                  
Debt Securities, Available-for-sale [Line Items]                  
Number of megawatts available in purchase power agreement (in megawatts) | MW       40 375        
PNM | Portfolio Three                  
Debt Securities, Available-for-sale [Line Items]                  
Number of megawatts available in purchase power agreement (in megawatts) | MW       150          
PNM | Fuel and purchased power costs | Commodity derivatives | Designated as Hedging Instrument                  
Debt Securities, Available-for-sale [Line Items]                  
Other current assets             9,800,000    
Current derivative liability             19,200,000    
PNM | Tri-State                  
Debt Securities, Available-for-sale [Line Items]                  
Power to be sold to third party (in megawatts) | MW               100  
PNM | Recurring                  
Debt Securities, Available-for-sale [Line Items]                  
Available-for-sale debt securities   $ 433,192,000     $ 433,192,000   417,476,000    
Nuclear Decommissioning Trust | PNM | Recurring                  
Debt Securities, Available-for-sale [Line Items]                  
Available-for-sale debt securities   342,700,000     342,700,000   325,300,000    
SJGS Decommissioning Trust | PNM | Recurring                  
Debt Securities, Available-for-sale [Line Items]                  
Available-for-sale debt securities   15,100,000     15,100,000   14,700,000    
Mine Reclamation Trust | PNM | Recurring                  
Debt Securities, Available-for-sale [Line Items]                  
Available-for-sale debt securities   $ 75,400,000     $ 75,400,000   $ 77,500,000