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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

X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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- Definition

The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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