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Regulatory and Rate Matters - Transportation Electrification Program (Details) $ in Millions | Jun. 30, 2021 USD ($) | Mar. 12, 2021 MW | Dec. 18, 2020 USD ($)
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Public Service Company of New Mexico |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Solar generation capacity related to unexecuted transmission service agreement (in megawatts) | MW |  | 145 |
Public Service Company of New Mexico | San Juan Generating Station | San Juan Generating Station Unit 1 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 50.00% |  |
Public Service Company of New Mexico | Insurance Deductible | San Juan Generating Station |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Estimate of possible loss | $ 1.0 |  |
San Juan Generating Station Owners | Insurance Deductible | San Juan Generating Station |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Estimate of possible loss | $ 2.0 |  |
Transportation Electrification Program | Public Service Company of New Mexico |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Expected budgeted expenditures |  |  | $ 8.4
Budget flexibility |  |  | 25.00%
Budget portion dedicated to low and moderate income customers, percent |  |  | 25.00%

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