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Financing - Financing Activities - PNM (Narrative) (Details)						12 Months Ended
	Nov. 15, 2023 USD ($)	May 15, 2023 USD ($)	Sep. 30, 2022 USD ($)	Aug. 05, 2022 USD ($)	Jun. 18, 2021 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 21, 2025 USD ($)	Jun. 03, 2024 USD ($)	May 10, 2024 USD ($)	Jun. 01, 2023 USD ($)	Apr. 28, 2023 USD ($) debtInstrument	Jun. 01, 2022 USD ($) derivative	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Repayments of debt						$ 819,529,000	$ 910,000,000	$ 179,500,000
Interest Rate Contract | Cash Flow Hedge
Debt Instrument [Line Items]
Derivative asset, number of instruments held | derivative														2
PNM
Debt Instrument [Line Items]
Repayments of debt						$ 200,529,000	410,000,000	179,500,000
5.92% due April 2053 | PNM | Notes Payable to Banks
Debt Instrument [Line Items]
Aggregate principal amount					$ 75,000,000
5.51% due April 2035 | PNM
Debt Instrument [Line Items]
Repayments of debt					$ 40,000,000
Pollution Control Revenue Bonds | PNM | Bonds
Debt Instrument [Line Items]
Term loans														$ 31,500,000	$ 104,500,000
Pollution Control Revenue Bonds Due June 2038 | PNM | Bonds
Debt Instrument [Line Items]
Aggregate principal amount														36,000,000	$ 36,000,000
Stated percentage (as a percent)															1.05%
Pollution Control Revenue Bonds Due June 2040, 1 | PNM | Bonds
Debt Instrument [Line Items]
Aggregate principal amount														$ 37,000,000	$ 37,000,000
Stated percentage (as a percent)															2.125%
Pollution Control Revenue Bonds Due June 2040, 2 | PNM | Bonds
Debt Instrument [Line Items]
Aggregate principal amount															$ 11,500,000
Stated percentage (as a percent)															1.20%
Pollution Control Revenue Bonds Due June 2042 | PNM | Bonds
Debt Instrument [Line Items]
Aggregate principal amount															$ 20,000,000
Stated percentage (as a percent)															2.45%
Pollution Control Revenue Bonds Due June 2024 | PNM | Bonds
Debt Instrument [Line Items]
Stated percentage (as a percent)														3.00%
PNM 2022 Delayed-Draw Term Loan | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of debt	$ 225,000,000
Financing capacity				$ 225,000,000
Proceeds from long-term lines of credit			$ 45,000,000	$ 180,000,000
Pollution Control Revenue Bonds, 1.1%, Due 2040 | Bonds
Debt Instrument [Line Items]
Aggregate principal amount								$ 130,000,000
Stated percentage (as a percent)								1.10%
Pollution Control Revenue Bonds, 3.90%, Due 2028 | Bonds
Debt Instrument [Line Items]
Aggregate principal amount												$ 130,000,000
Stated percentage (as a percent)												3.90%
PNM 3.15%, Senior Unsecured Notes, Due May 2023 | Senior Unsecured Notes
Debt Instrument [Line Items]
Stated percentage (as a percent)								3.15%
Repayments of debt		$ 55,000,000
PNM 3.15%, Senior Unsecured Notes, Due May 2023 | PNM | Senior Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount								$ 55,000,000
Stated percentage (as a percent)								3.15%
PNM 2023 Note Purchase Agreement | PNM | Senior Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount													$ 200,000,000
Number of debt issuances | debtInstrument													2
PNM 2023 SUNs at 5.15% Due April 28, 2035 | PNM | Senior Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount													$ 150,000,000
Stated percentage (as a percent)													5.51%
PNM 2023 SUNs at 5.92% Due April 28, 2053 | PNM | Senior Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount													$ 50,000,000
Stated percentage (as a percent)													5.92%
PNM 2024 Term Loan | Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount											$ 200,000,000
Variable rate (as a percent)						5.40%
PCRBs, 3.00% Due 2040 | Bonds
Debt Instrument [Line Items]
Aggregate principal amount							$ 37,000,000
Stated percentage (as a percent)							3.00%
PCRBs, 1.15% Due 2040 | Bonds
Debt Instrument [Line Items]
Aggregate principal amount							$ 125,000,000
Stated percentage (as a percent)							1.15%
PCRBs, 3.00% Due 2038 | Bonds
Debt Instrument [Line Items]
Aggregate principal amount							$ 36,000,000
Stated percentage (as a percent)							3.00%
PCRBs, 3.875% Due 2029 | Bonds
Debt Instrument [Line Items]
Aggregate principal amount										$ 198,000,000
Stated percentage (as a percent)										3.875%
PNM 2025 Term Loan | Secured Debt | Subsequent Event
Debt Instrument [Line Items]
Aggregate principal amount									$ 195,000,000

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