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Fair Value of Derivative and Other Financial Instruments - Items Recorded and Presented by Level of Hierarchy (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | $ 4,335,572 |  | $ 4,260,509
Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 4,638,825 |  | 4,521,811
PNM |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 2,086,662 |  | 2,107,588
PNM | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 2,262,325 |  | 2,261,780
TNMP |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 1,248,910 |  | 1,152,922
TNMP | Carrying Amount |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of long-term debt | 1,377,255 |  | 1,260,880
Recurring | PNM |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 448,164 |  | 444,408
Investments, unrealized gain | 3,896 | $ 14,316 |
Recurring | PNM | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 361,724 |  | 264,287
Recurring | PNM | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 47,261 |  | 180,121
Recurring | PNM | Cash and cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 122,332 |  | 93,873
Recurring | PNM | Cash and cash equivalents | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 122,332 |  | 93,873
Recurring | PNM | Cash and cash equivalents | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | 0 |  | 0
Recurring | PNM | Corporate stocks, common |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 81,045 |  | 77,422
Recurring | PNM | Corporate stocks, common | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 81,045 |  | 77,422
Recurring | PNM | Corporate stocks, common | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 0 |  | 0
Recurring | PNM | Corporate stocks, preferred |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 0 |  | 4,323
Recurring | PNM | Corporate stocks, preferred | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 0 |  | 504
Recurring | PNM | Corporate stocks, preferred | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 0 |  | 3,819
Recurring | PNM | Mutual funds and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 131,306 |  | 57,966
Recurring | PNM | Mutual funds and other | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 131,306 |  | 57,966
Recurring | PNM | Mutual funds and other | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 0 |  | 0
Recurring | PNM | Uncategorized Collective Investment Trusts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities | 39,179 |  |
Recurring | PNM | Uncategorized Collective Investment Trusts | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  |  |
Recurring | PNM | Uncategorized Collective Investment Trusts | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Equity securities |  |  |
Recurring | PNM | U.S. government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 27,041 |  | 35,113
Investments, unrealized gain | 1,874 | 2,055 |
Recurring | PNM | U.S. government | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 27,041 |  | 34,522
Recurring | PNM | U.S. government | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 0 |  | 591
Recurring | PNM | International government |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 0 |  | 8,735
Investments, unrealized gain | 0 | 104 |
Recurring | PNM | International government | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 0 |  | 0
Recurring | PNM | International government | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  |  | 8,735
Recurring | PNM | Municipals |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 35,260 |  | 53,436
Investments, unrealized gain | 1,227 | 2,872 |
Recurring | PNM | Municipals | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 0 |  | 0
Recurring | PNM | Municipals | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 35,260 |  | 53,436
Recurring | PNM | Corporate and other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | 12,001 |  | 113,540
Investments, unrealized gain | 795 | $ 9,285 |
Recurring | PNM | Corporate and other | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities |  |  | 0
Recurring | PNM | Corporate and other | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale debt securities | $ 12,001 |  | $ 113,540

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