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Fair Value of Derivative and Other Financial Instruments - Narrative (Details)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) MW	Sep. 30, 2022 USD ($)	Jun. 30, 2022 MW power_purchase_agreement	Sep. 30, 2023 USD ($) MW	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	May 31, 2022 MW	Jan. 01, 2018 MW
Debt Securities, Available-for-sale [Line Items]
Number of purchase power agreements, non derivatives | power_purchase_agreement			2
Obligations to return cash						$ 200,000
PNM
Debt Securities, Available-for-sale [Line Items]
Number of purchase power agreements | power_purchase_agreement			3
Expected exposure to market risk (in megawatts) | MW	36			36			50	65
Amounts recognized for right to reclaim cash	$ 0			$ 0		0
Cash collateral under margin arrangements	1,000,000			1,000,000		10,500,000
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings	(600,000)	$ (7,100,000)		2,800,000	$ (28,700,000)
PNM | Commodity derivatives | Designated as Hedging Instrument
Debt Securities, Available-for-sale [Line Items]
Other current assets	603,000			603,000		9,780,000
Current derivative liability	$ 3,514,000			$ 3,514,000		19,209,000
PNM | Portfolio One
Debt Securities, Available-for-sale [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW	85		85
PNM | Portfolio Two
Debt Securities, Available-for-sale [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW			40	375
PNM | Portfolio Three
Debt Securities, Available-for-sale [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW			150
PNM | Fuel and purchased power costs | Commodity derivatives | Designated as Hedging Instrument
Debt Securities, Available-for-sale [Line Items]
Other current assets						9,800,000
Current derivative liability						19,200,000
PNM | Tri-State
Debt Securities, Available-for-sale [Line Items]
Power to be sold to third party (in megawatts) | MW							100
PNM | Recurring
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	$ 421,377,000			$ 421,377,000		417,476,000
Nuclear Decommissioning Trust | PNM | Recurring
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	334,000,000			334,000,000		325,300,000
SJGS Decommissioning Trust | PNM | Recurring
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	15,300,000			15,300,000		14,700,000
Mine Reclamation Trust | PNM | Recurring
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	$ 72,100,000			$ 72,100,000		$ 77,500,000

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