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Financing - Short-term Debt and Liquidity (Details) |  |  | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2024 USD ($) | Apr. 01, 2024 USD ($) extension_option | Feb. 28, 2025 USD ($) | Aug. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | May 20, 2022 USD ($) | May 13, 2022 USD ($) | Mar. 11, 2022 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 3,100,000 |  |  |  |
Short-term debt |  |  |  |  | 244,500,000 | $ 261,900,000 |  |  |
PNMR Development |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  | 0 | 0 |  |  |
ETBC 1 | Forecast |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Scheduled payments |  |  | $ 3,400,000 | $ 2,500,000 |  |  |  |  |
PNMR Revolving Credit Facility | WEB LOC Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 30,300,000 |  |  |  |
PNM |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 0 |  |  |  |
Short-term debt |  |  |  |  | 186,200,000 | 137,500,000 |  |  |
PNM | PNMR |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  | 2,300,000 |  |  |  |
PNM | Lines of credit |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
NMPRC approved credit facility |  |  |  |  |  |  | $ 40,000,000 |  |
TNMP |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 0 |  |  |  |
Short-term debt |  |  |  |  | 18,300,000 | 55,100,000 |  |  |
TNMP | PNMR |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  | 0 |  |  |  |
TNMP | TNMP 2024 Bond Purchase Agreement | Subsequent event | Unsecured Debt |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of unsecured debt | $ 128,000,000 |  |  |  |  |  |  |  |
PNMR Development | PNMR |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  | 100,000 | 2,300,000 |  |  |
PNMR Development | PNMR Revolving Credit Facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  | 40,000,000 | $ 69,300,000 |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  | 300,000,000 |  |  |  |
Revolving credit facility | PNM |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  | 400,000,000 |  |  |  |
Revolving credit facility | TNMP |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  |  |  |  |  | $ 100,000,000
Revolving credit facility | TNMP | Subsequent event |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  | $ 200,000,000 |  |  |  |  |  |  |
Number of extensions | extension_option |  | 2 |  |  |  |  |  |  |
Extension period |  | 1 year |  |  |  |  |  |  |
Revolving credit facility | TNMP | First mortgage bonds |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount |  |  |  |  |  |  |  | $ 100,000,000 |
Revolving credit facility | TNMP | First Mortgage Bonds Due 2029 | Subsequent event |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Collateral amount |  | $ 200,000,000 |  |  |  |  |  |  |
Revolving credit facility | PNMR and PNM | Subsequent event |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Number of extensions | extension_option |  | 2 |  |  |  |  |  |  |
Extension period |  | 1 year |  |  |  |  |  |  |
Senior Unsecured Noted, Pollution Control Revenue Bonds | PNM | Pollution Control Revenue Bonds, Due June 2024 |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  | 198,000,000 |  |  |  |
Senior Unsecured Noted, Pollution Control Revenue Bonds | TNMP | FMB Notes Due July 2024 |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  | $ 80,000,000 |  |  |  |

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