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Regulatory and Rate Matters - Facebook Data Center Project (Details) | 12 Months Ended |  |  |  |  |
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Dec. 31, 2018 power_purchase_agreement Facility MW | Dec. 31, 2021 MW | Oct. 01, 2021 MW | Jul. 28, 2021 MW | Jun. 23, 2021 MW | Feb. 08, 2021 MW
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |  |
Facebook Data Center |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) |  |  |  | 190 |  | 190
PPA term | 25 years |  |  |  |  |
Number of megawatts in battery storage facilities (in megawatts) |  |  | 100 | 100 | 100 | 100
Solar generation capacity expected to be operational (in megawatts) |  |  |  | 50 |  | 50
Number of megawatts in battery storage facilities approved (in megawatts) |  |  | 50 | 50 |  |
PNMR Development |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) |  | 130 |  |  |  |
Ownership percentage |  | 50.00% |  |  |  |
PNMR Development | Facebook Data Center |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) | 50 |  |  |  |  |
Casa Mesa Wind, LLC | Facebook Data Center |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) | 50 |  |  |  |  |
Avangrid Renewables, LLC | Facebook Data Center |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) | 166 |  |  |  |  |
Route 66 Solar Energy Center, LLC | Facebook Data Center |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) | 50 |  |  |  |  |
NMRD | Facebook Data Center |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) | 100 |  |  |  |  |
Number of additional PPAs | power_purchase_agreement | 2 |  |  |  |  |
Number of solar facilities | Facility | 2 |  |  |  |  |

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