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Financing - Financing Activities - PNM (Narrative) (Details) |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |
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Nov. 15, 2023 USD ($) | May 15, 2023 USD ($) | Sep. 30, 2022 USD ($) | Aug. 05, 2022 USD ($) | Jun. 18, 2021 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 21, 2025 USD ($) | Jun. 03, 2024 USD ($) | May 10, 2024 USD ($) | Jun. 01, 2023 USD ($) | Apr. 28, 2023 USD ($) debtInstrument | Jun. 01, 2022 USD ($) derivative | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 819,529,000 | $ 910,000,000 | $ 179,500,000 |  |  |  |  |  |  |
Interest Rate Contract | Cash Flow Hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset, number of instruments held | derivative |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
PNM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 200,529,000 | 410,000,000 | 179,500,000 |  |  |  |  |  |  |
5.92% due April 2053 | PNM | Notes Payable to Banks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |
5.51% due April 2035 | PNM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |
Pollution Control Revenue Bonds | PNM | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loans |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,500,000 | $ 104,500,000
Pollution Control Revenue Bonds Due June 2038 | PNM | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 | $ 36,000,000
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.05%
Pollution Control Revenue Bonds Due June 2040, 1 | PNM | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,000,000 | $ 37,000,000
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.125%
Pollution Control Revenue Bonds Due June 2040, 2 | PNM | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,500,000
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.20%
Pollution Control Revenue Bonds Due June 2042 | PNM | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.45%
Pollution Control Revenue Bonds Due June 2024 | PNM | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |
PNM 2022 Delayed-Draw Term Loan | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from long-term lines of credit |  |  | $ 45,000,000 | $ 180,000,000 |  |  |  |  |  |  |  |  |  |  |
Pollution Control Revenue Bonds, 1.1%, Due 2040 | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 130,000,000 |  |  |  |  |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  |  | 1.10% |  |  |  |  |  |  |
Pollution Control Revenue Bonds, 3.90%, Due 2028 | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 130,000,000 |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 3.90% |  |  |
PNM 3.15%, Senior Unsecured Notes, Due May 2023 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  |  | 3.15% |  |  |  |  |  |  |
Repayments of debt |  | $ 55,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
PNM 3.15%, Senior Unsecured Notes, Due May 2023 | PNM | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 55,000,000 |  |  |  |  |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  |  | 3.15% |  |  |  |  |  |  |
PNM 2023 Note Purchase Agreement | PNM | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |
Number of debt issuances | debtInstrument |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
PNM 2023 SUNs at 5.15% Due April 28, 2035 | PNM | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 5.51% |  |
PNM 2023 SUNs at 5.92% Due April 28, 2053 | PNM | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 5.92% |  |
PNM 2024 Term Loan | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |
Variable rate (as a percent) |  |  |  |  |  | 5.40% |  |  |  |  |  |  |  |  |
PCRBs, 3.00% Due 2040 | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 37,000,000 |  |  |  |  |  |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
PCRBs, 1.15% Due 2040 | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  | 1.15% |  |  |  |  |  |  |  |
PCRBs, 3.00% Due 2038 | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 36,000,000 |  |  |  |  |  |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
PCRBs, 3.875% Due 2029 | Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 198,000,000 |  |  |  |  |
Stated percentage (as a percent) |  |  |  |  |  |  |  |  |  | 3.875% |  |  |  |  |
PNM 2025 Term Loan | Secured Debt | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 195,000,000 |  |  |  |  |  |

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