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Regulatory and Rate Matters - Energy Efficiency and Load Management (Narrative) (Details) - PNM $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) program	Dec. 31, 2020 USD ($) GWh MMBTU program
Energy Efficiency and Load Management Program
Public Utilities, General Disclosures [Line Items]
Number of programs | program		12
Program costs related to energy efficiency, in year one		$ 31.4
Program costs related to energy efficiency, in year two		31.0
Program costs related to energy efficiency, in year three		$ 29.6
2021 Energy Efficiency Annual Report | Disincentives and Incentives Added
Public Utilities, General Disclosures [Line Items]
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | GWh		94
Energy Efficiency and Load Management Program, 2024
Public Utilities, General Disclosures [Line Items]
Number of programs | program	10
Program costs related to energy efficiency, in year one	$ 34.5
Program costs related to energy efficiency, in year two	35.4
Program costs related to energy efficiency, in year three	$ 36.5
Minimum | Energy Efficiency and Load Management Program
Public Utilities, General Disclosures [Line Items]
Profit incentive sliding scale multiplier	0.071
Minimum | Renewable Portfolio Standard
Public Utilities, General Disclosures [Line Items]
Profit incentive sliding scale multiplier		0.071
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU		80
Maximum | Energy Efficiency and Load Management Program
Public Utilities, General Disclosures [Line Items]
Profit incentive sliding scale multiplier	0.0882

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