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Regulatory and Rate Matters - COVID-19 Regulatory Matters (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |
Regulatory assets | $ 846,686 | $ 514,258
Regulatory liabilities | 755,202 | 841,393
Public Service Company of New Mexico |  |
Public Utilities, General Disclosures [Line Items] |  |
Regulatory assets | 763,941 | 428,981
Regulatory liabilities | 556,989 | 653,830
Public Service Company of New Mexico | COVID-19 cost savings |  |
Public Utilities, General Disclosures [Line Items] |  |
Regulatory liabilities | 900 | 900
COVID-19 | Public Service Company of New Mexico | COVID-19 cost savings |  |
Public Utilities, General Disclosures [Line Items] |  |
Regulatory liabilities | 900 | 900
Deferred COVID-19 costs | Public Service Company of New Mexico |  |
Public Utilities, General Disclosures [Line Items] |  |
Regulatory assets | 5,664 | 6,896
Deferred COVID-19 costs | COVID-19 | Public Service Company of New Mexico |  |
Public Utilities, General Disclosures [Line Items] |  |
Regulatory assets | 5,700 | $ 6,900
Decrease in other regulatory assets | $ 2,700 |

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- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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