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Regulatory and Rate Matters - Renewable Energy Portfolio Standard (Narrative) (Details) - PNM $ in Millions			12 Months Ended
	Jun. 03, 2024 USD ($)	Jan. 01, 2024 USD ($)	Dec. 31, 2024 MW
Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Solar photovoltaic capacity (in mw)			158
Solar distributed generation (in mw)			308.5
Renewable energy rider
Public Utilities, General Disclosures [Line Items]
NMPRC-approved return on equity (as a percent)			0.50%
NMPRC
Public Utilities, General Disclosures [Line Items]
Proposed revision to rider that will allow for recovery | $	$ 58.7	$ 59.0
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
Lightning Dock Geothermal | Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Geothermal energy capacity (in mw)			11

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