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Fair Value of Derivative and Other Financial Instruments - Schedule of Items Recorded at Fair Value By PNM on the Consolidated Balance Sheets by Level of the Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investment securities $ 475,524 $ 444,408
PNM    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investment securities 475,524 444,408
PNM | Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 453,421  
Unrealized Gains 324 14,316
Uncategorized Collective Investment Trust 22,103  
Total investment securities 475,524 444,408
PNM | Recurring Basis | Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 150,745 93,873
PNM | Recurring Basis | Corporate stocks, common    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 134,553 77,422
PNM | Recurring Basis | Corporate stocks, preferred    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value   4,323
PNM | Recurring Basis | Mutual funds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 135,779 57,966
PNM | Recurring Basis | U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 25,148 35,113
Unrealized Gains 202 2,055
PNM | Recurring Basis | International government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   8,735
Unrealized Gains   104
PNM | Recurring Basis | Municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 0 53,436
Unrealized Gains 0 2,872
PNM | Recurring Basis | Corporate and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 7,196 113,540
Unrealized Gains 122 9,285
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 446,225  
Total investment securities   264,287
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 150,745 93,873
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, common    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 134,553 77,422
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, preferred    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value   504
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 135,779 57,966
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 25,148 34,522
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | International government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   0
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 0 0
PNM | Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 0 0
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 7,196  
Total investment securities   180,121
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 0 0
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate stocks, common    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 0 0
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate stocks, preferred    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value   3,819
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Mutual funds and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, at fair value 0 0
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 0 591
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | International government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value   8,735
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value 0 53,436
PNM | Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, fair value $ 7,196 $ 113,540