Regulatory and Rate Matters - Summer Peak Resource Adequacy (Details)						1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jan. 30, 2023 MW	Jul. 19, 2022 MW	Mar. 18, 2022 MW	Feb. 17, 2022 MW	Nov. 15, 2015 power_purchase_agreement	Jun. 30, 2022 MW	Dec. 31, 2022 MW	Dec. 31, 2021 power_purchase_agreement	Dec. 31, 2022 MW	Dec. 31, 2021 MW replacementResource power_purchase_agreement
Public Utilities, General Disclosures [Line Items]
Number of replacement resources | replacementResource										4
Number of purchase power agreements | power_purchase_agreement								3
Public Service Company of New Mexico
Public Utilities, General Disclosures [Line Items]
Number of purchase power agreements | power_purchase_agreement					2					3
Number of megawatts available in purchase power agreement (in megawatts)			65	327
Number of megawatts, peak during period		2,139
Public Service Company of New Mexico | Portfolio One
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts)						35	270		85	85
Public Service Company of New Mexico | Portfolio Two
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts)						25			150	40
Public Service Company of New Mexico | Portfolio Three
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts)							40		40	150
Public Service Company of New Mexico | Solar Agreement | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts)	100
Public Service Company of New Mexico | Battery Storage Agreement | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Number of megawatts available in purchase power agreement (in megawatts)	30
Public Service Company of New Mexico | Minimum
Public Utilities, General Disclosures [Line Items]
Projected reserve margin							10.30%
Public Service Company of New Mexico | Maximum
Public Utilities, General Disclosures [Line Items]
Projected reserve margin							6.00%