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Regulatory and Rate Matters - Renewable Portfolio Standard (Details) - Public Service Company of New Mexico |  |  |  |  |  | 12 Months Ended |
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Jun. 01, 2021 USD ($) | Jan. 01, 2021 USD ($) | Nov. 18, 2020 | Jun. 01, 2020 USD ($) | Jun. 03, 2019 MW | Dec. 31, 2021 USD ($) MW | Jul. 29, 2020 MW
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Solar distributed generation (in mw) |  |  |  |  |  |  | 650
Renewable Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Solar photovoltaic capacity (in mw) |  |  |  |  |  | 158 |
Solar distributed generation (in mw) |  |  |  |  |  | 201.2 |
Renewable Portfolio Standard | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Reasonable cost threshold in megawatts per hour | $ |  |  |  |  |  | $ 60 |
Renewable Energy Rider |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
NMPRC-approved return on equity |  |  |  |  |  | 0.50% |
NMPRC |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Proposed revision to rider that will allow for recovery | $ | $ 66,900,000 |  |  |  |  |  |
NMPRC | Renewable Energy Rider |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Proposed revision to rider that will allow for recovery | $ |  |  |  | $ 67,800,000 |  |  |
Renewable energy procurement plan, approved recovery amount | $ |  | $ 65,500,000 |  |  |  |  |
NMPRC | Renewable Energy Rider, Sky Blue Energy Program |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Proposed revision to rider that will allow for recovery | $ |  | $ 2,300,000 |  | $ 2,300,000 |  |  |
Renewable energy procurement plan, carrying charges, percent |  |  | 4.00% | 8.64% |  |  |
Renewable energy procurement plan, carrying charges | $ |  |  |  | $ 700,000 |  |  |
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 |
Solar distributed generation (in mw) |  |  |  |  | 140 |  |
PPA term |  |  |  |  | 20 years |  |
Lightning Dock Geothermal | Renewable Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Geothermal energy capacity (in mw) |  |  |  |  |  | 11 |

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