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Regulatory and Rate Matters - Renewable Energy Portfolio Standard (Narrative) (Details) - PNM $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 03, 2024 USD ($) | Jan. 01, 2024 USD ($) | Dec. 31, 2024 MW
Renewable Portfolio Standard |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Solar photovoltaic capacity (in mw) |  |  | 158
Solar distributed generation (in mw) |  |  | 308.5
Renewable energy rider |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
NMPRC-approved return on equity (as a percent) |  |  | 0.50%
NMPRC |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Proposed revision to rider that will allow for recovery | $ | $ 58.7 | $ 59.0 |
New Mexico Wind | Renewable Portfolio Standard 2014 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Wind energy capacity (in mw) |  |  | 200
Red Mesa Wind | Renewable Portfolio Standard 2014 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Wind energy capacity (in mw) |  |  | 102
La Joya Wind | Renewable Portfolio Standard |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Wind energy capacity (in mw) |  |  | 140
Lightning Dock Geothermal | Renewable Portfolio Standard |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Geothermal energy capacity (in mw) |  |  | 11

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