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Regulatory and Rate Matters - Renewable Portfolio Standard (Details) - Public Service Company of New Mexico						12 Months Ended
	Jun. 01, 2021 USD ($)	Jan. 01, 2021 USD ($)	Nov. 18, 2020	Jun. 01, 2020 USD ($)	Jun. 03, 2019 MW	Dec. 31, 2021 USD ($) MW	Jul. 29, 2020 MW
Public Utilities, General Disclosures [Line Items]
Solar distributed generation (in mw)							650
Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Solar photovoltaic capacity (in mw)						158
Solar distributed generation (in mw)						201.2
Renewable Portfolio Standard | Maximum
Public Utilities, General Disclosures [Line Items]
Reasonable cost threshold in megawatts per hour | $						$ 60
Renewable Energy Rider
Public Utilities, General Disclosures [Line Items]
NMPRC-approved return on equity						0.50%
NMPRC
Public Utilities, General Disclosures [Line Items]
Proposed revision to rider that will allow for recovery | $	$ 66,900,000
NMPRC | Renewable Energy Rider
Public Utilities, General Disclosures [Line Items]
Proposed revision to rider that will allow for recovery | $				$ 67,800,000
Renewable energy procurement plan, approved recovery amount | $		$ 65,500,000
NMPRC | Renewable Energy Rider, Sky Blue Energy Program
Public Utilities, General Disclosures [Line Items]
Proposed revision to rider that will allow for recovery | $		$ 2,300,000		$ 2,300,000
Renewable energy procurement plan, carrying charges, percent			4.00%	8.64%
Renewable energy procurement plan, carrying charges | $				$ 700,000
New Mexico Wind | Renewable Portfolio Standard 2014
Public Utilities, General Disclosures [Line Items]
Wind energy capacity (in mw)						200
Red Mesa Wind | Renewable Portfolio Standard 2014
Public Utilities, General Disclosures [Line Items]
Wind energy capacity (in mw)						102
La Joya Wind | Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Wind energy capacity (in mw)						140
Solar distributed generation (in mw)					140
PPA term					20 years
Lightning Dock Geothermal | Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Geothermal energy capacity (in mw)						11

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