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v3.24.3

Financing - Short-term Debt and Liquidity (Details) |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 01, 2024 USD ($) extension_option | Aug. 31, 2025 USD ($) | May 31, 2025 USD ($) | Feb. 28, 2025 USD ($) | Sep. 30, 2024 USD ($) extension_option | Dec. 31, 2023 USD ($) | May 20, 2022 USD ($) | Mar. 11, 2022 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | $ 3,100,000 |  |  |
Short-term debt |  |  |  |  | 459,000,000 | $ 261,900,000 |  |
PNMR Development |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Notes payable |  |  |  |  | 0 | 0 |  |
WEB LOC Facility | TXNM Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 30,300,000 |  |  |
ETBC 1 | Forecast |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Scheduled payments |  | $ 3,500,000 |  | $ 3,400,000 |  |  |  |
PNM 2023 Note Purchase Agreement | Forecast |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Scheduled payments |  | $ 250,000,000 | $ 104,000,000 |  |  |  |  |
TXNM 2021 Delayed Draw Term Loan | Bonds |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 51,000,000 |  |  |
PNM |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 0 |  |  |
Short-term debt |  |  |  |  | 179,900,000 | 137,500,000 |  |
PNM | Lines of credit |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
NMPRC approved credit facility |  |  |  |  |  |  | $ 40,000,000.0 |
TNMP |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 0 |  |  |
Short-term debt |  |  |  |  | 97,500,000 | 55,100,000 |  |
PNMR Development | TXNM |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  | 0 | $ 2,300,000 |  |
Revolving credit facility |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  | 300,000,000.0 |  |  |
Revolving credit facility | PNM |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity |  |  |  |  | 400,000,000.0 |  |  |
Revolving credit facility | TXNM and PNM |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Number of extensions | extension_option | 2 |  |  |  |  |  |  |
Extension period | 1 year |  |  |  |  |  |  |
Revolving credit facility | TNMP |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Financing capacity | $ 200,000,000 |  |  |  | $ 200,000,000 |  |  | $ 100,000,000
Number of extensions | extension_option |  |  |  |  | 2 |  |  |
Extension period |  |  |  |  | 1 year |  |  |
Revolving credit facility | TNMP | First Mortgage Bonds Due 2029 |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |
Collateral amount |  |  |  |  | $ 200,000,000 |  |  |

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