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Regulatory and Rate Matters - Renewable Energy Portfolio Standard (Details) $ in Millions			12 Months Ended
	Jun. 01, 2023 USD ($)	Jan. 01, 2023 USD ($)	Dec. 31, 2023 MW
Public Utilities, General Disclosures [Line Items]
Approved return on equity			10.075%
Allowed return on equity			9.575%
NMPRC
Public Utilities, General Disclosures [Line Items]
Return on equity			10.173%
PNM | Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Solar photovoltaic capacity (in mw)			158
Solar distributed generation (in mw)			281.6
PNM | Renewable energy rider
Public Utilities, General Disclosures [Line Items]
NMPRC-approved return on equity			0.50%
Allowed return on equity, additional			0.50%
PNM | NMPRC
Public Utilities, General Disclosures [Line Items]
Proposed revision to rider that will allow for recovery | $	$ 59.0	$ 61.0
New Mexico Wind | PNM | Renewable Portfolio Standard 2014
Public Utilities, General Disclosures [Line Items]
Wind energy capacity (in mw)			200
Red Mesa Wind | PNM | Renewable Portfolio Standard 2014
Public Utilities, General Disclosures [Line Items]
Wind energy capacity (in mw)			102
La Joya Wind | PNM | Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Wind energy capacity (in mw)			140
Lightning Dock Geothermal | PNM | Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Geothermal energy capacity (in mw)			11

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