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Regulatory and Rate Matters - PNM (Details) $ in Millions							3 Months Ended		9 Months Ended
	Jun. 01, 2022 USD ($)	Apr. 15, 2022 USD ($)	Jan. 01, 2022 USD ($)	Apr. 15, 2021 USD ($) GWh	Jan. 29, 2021	Apr. 15, 2020 USD ($) MMBTU	Sep. 30, 2022 USD ($) $ / MWh MW	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) $ / MWh MW	Sep. 30, 2021 USD ($)	Dec. 31, 2021 GWh	Jul. 29, 2020 MW
Public Utilities, Commitments And Contingencies [Line Items]
Excess return on jurisdictional equity that would require refund							0.50%		0.50%
PNM
Public Utilities, Commitments And Contingencies [Line Items]
Solar generation capacity (in megawatts)												650
Renewable Portfolio Standard | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Number of megawatts of Solar PV facilities							158		158
Current output in the geothermal facility (in megawatts)							11		11
Solar generation capacity (in megawatts)							228.5		228.5
Energy Efficiency and Load Management Program | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Program costs related to energy efficiency, in year two | $						$ 31.4
Program costs related to energy efficiency, in year three | $						31.0
Program costs related to energy efficiency, in year four | $						$ 29.6
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU						94
Integrated Resource Plan, 2011 | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Frequency of IRP filings									3 years
Planning period covered of IRP									20 years
Integrated Resource Plan, 2020 | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Planning period covered of IRP					20 years
NMPRC
Public Utilities, Commitments And Contingencies [Line Items]
Action plan, covered period									4 years
NMPRC | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Proposed revision to rider that will allow for recovery | $	$ 61.0		$ 66.9
NMPRC | Renewable Energy Rider | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Recorded revenues from renewable rider | $							$ 12.7	$ 13.0	$ 44.5	$ 44.4
Maximum | Renewable Portfolio Standard | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Reasonable cost threshold in megawatts per hour | $ / MWh							60		60
Minimum | Renewable Portfolio Standard | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Profit incentive sliding scale multiplier						0.071
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU						80
New Mexico Wind | Renewable Portfolio Standard 2014 | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Number of megawatts for wind energy									200
Red Mesa Wind | Renewable Portfolio Standard 2014 | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Number of megawatts for wind energy									102
La Joya Wind | Renewable Portfolio Standard | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Number of megawatts for wind energy									140
Disincentives and Incentives Added | 2020 Energy Efficiency Annual Report | PNM
Public Utilities, Commitments And Contingencies [Line Items]
Energy efficiency and load management programs | $		$ 0.3		$ 0.8
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh				87							94

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