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Fair Value of Derivative and Other Financial Instruments - Schedule of Fair Values of Investments Held by the Employee Benefit Plans and PNMR Master Trust (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
PNM | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 379,154	$ 407,211	$ 410,463
PNM | Pension Plan | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	379,074
PNM | Pension Plan | Investments categorized within fair value hierarchy | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		407,717
PNM | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	72,003	73,392	70,301
PNM | Other Postretirement Benefits | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	70,714	73,383
PNM | Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	319,528	342,296
PNM | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	39,538	50,093
PNM | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Cash and cash equivalents | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	825	2,419
PNM | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Mutual funds | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	38,713	47,674
PNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Plan | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	106,220	136,474
PNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		46,122
PNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	39,538
PNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Cash and cash equivalents | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	825	2,419
PNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Mutual funds | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	38,713	43,703
PNM | Significant Other Observable Inputs (Level 2) | Pension Plan | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	213,308	205,822
PNM | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		3,971
PNM | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0
PNM | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Cash and cash equivalents | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
PNM | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Mutual funds | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	3,971
PNM | Fair Value Measured at Net Asset Value Per Share | Pension Plan | Uncategorized investments | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	59,546	65,421
PNM | Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits | Uncategorized investments | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	31,176	23,290
TNMP | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	38,225	41,353	43,447
TNMP | Pension Plan | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	38,166
TNMP | Pension Plan | Investments categorized within fair value hierarchy | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		41,128
TNMP | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,542	8,353	$ 8,718
TNMP | Other Postretirement Benefits | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,582
TNMP | Fair Value, Inputs, Level 1, 2 and 3 | Pension Plan | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	33,294	35,870
TNMP | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		8,403
TNMP | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Cash and cash equivalents | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	111	162
TNMP | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Mutual funds | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	6,987	8,241
TNMP | Fair Value, Inputs, Level 1, 2 and 3 | Other Postretirement Benefits | Investments Categorized Within Fair Value Hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,098
TNMP | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Plan | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,543	12,192
TNMP | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		7,968
TNMP | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Cash and cash equivalents | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	111	162
TNMP | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Mutual funds | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	6,987	7,806
TNMP | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Postretirement Benefits | Investments Categorized Within Fair Value Hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	7,098
TNMP | Significant Other Observable Inputs (Level 2) | Pension Plan | Investments categorized within fair value hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	25,751	23,678
TNMP | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount		435
TNMP | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Cash and cash equivalents | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
TNMP | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Mutual funds | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	435
TNMP | Significant Other Observable Inputs (Level 2) | Other Postretirement Benefits | Investments Categorized Within Fair Value Hierarchy | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0
TNMP | Fair Value Measured at Net Asset Value Per Share | Pension Plan | Uncategorized investments | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	4,872	5,258
TNMP | Fair Value Measured at Net Asset Value Per Share | Other Postretirement Benefits | Uncategorized investments | Estimate of Fair Value Measurement | Recurring Basis
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	484
TXNM
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 417,240	$ 448,845
TXNM | Private equity funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share	Fair Value Measured at Net Asset Value Per Share
TXNM | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share	Fair Value Measured at Net Asset Value Per Share
TXNM | Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List]	Fair Value Measured at Net Asset Value Per Share	Fair Value Measured at Net Asset Value Per Share
TXNM | Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 352,822	$ 378,166
TXNM | Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	10,981	13,995
TXNM | Fair Value, Inputs, Level 1, 2 and 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	146,858	159,281
TXNM | Fair Value, Inputs, Level 1, 2 and 3 | Corporate stocks, common
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	34,418	27,167
TXNM | Fair Value, Inputs, Level 1, 2 and 3 | Corporate stocks, preferred
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	741
TXNM | Fair Value, Inputs, Level 1, 2 and 3 | U.S. government
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	56,303	61,684
TXNM | Fair Value, Inputs, Level 1, 2 and 3 | International government
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	4,713
TXNM | Fair Value, Inputs, Level 1, 2 and 3 | Municipals
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	4,718	5,071
TXNM | Fair Value, Inputs, Level 1, 2 and 3 | Corporate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	99,544	105,514
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	113,763	148,666
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	10,981	13,995
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	45,333	49,219
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, common
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	34,418	27,167
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate stocks, preferred
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	741
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	23,031	57,544
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | International government
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipals
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
TXNM | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
TXNM | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	239,059	229,500
TXNM | Significant Other Observable Inputs (Level 2) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
TXNM | Significant Other Observable Inputs (Level 2) | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	101,525	110,062
TXNM | Significant Other Observable Inputs (Level 2) | Corporate stocks, common
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
TXNM | Significant Other Observable Inputs (Level 2) | Corporate stocks, preferred
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	0
TXNM | Significant Other Observable Inputs (Level 2) | U.S. government
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	33,272	4,140
TXNM | Significant Other Observable Inputs (Level 2) | International government
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	0	4,713
TXNM | Significant Other Observable Inputs (Level 2) | Municipals
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	4,718	5,071
TXNM | Significant Other Observable Inputs (Level 2) | Corporate and other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	99,544	105,514
TXNM | Fair Value Measured at Net Asset Value Per Share | Private equity funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	2,846	5,617
TXNM | Fair Value Measured at Net Asset Value Per Share | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	34,126	35,137
TXNM | Fair Value Measured at Net Asset Value Per Share | Real estate funds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, plan assets, amount	$ 27,446	$ 29,925

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Indicates level within fair value hierarchy and fair value measured at net asset value per share as practical expedient, of defined benefit plan asset.

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