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Regulatory and Rate Matters - Transportation Electrification Program (Details) $ in Millions	Jun. 30, 2021 USD ($)	Mar. 12, 2021 MW	Dec. 18, 2020 USD ($)
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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