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Summary of the Business and Significant Accounting Policies - Schedule of Average Straight-Line Rates and Depreciation on Electric, Common, Intangible, and General Plant (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
PNM
Public Utilities, General Disclosures [Line Items]
Depreciation	$ 188,035	$ 158,956	$ 163,162
TNMP
Public Utilities, General Disclosures [Line Items]
Average straight-line rate (as a percent)	3.74%	3.77%	3.72%
Depreciation	$ 124,976	$ 110,675	$ 96,131
Electric plant | PNM
Public Utilities, General Disclosures [Line Items]
Average straight-line rate (as a percent)	2.87%	2.67%	2.55%
Common, intangible, and general plant | PNM
Public Utilities, General Disclosures [Line Items]
Average straight-line rate (as a percent)	14.06%	7.64%	7.83%

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Composite depreciation rate for public utility plants in service.

+ References

No definition available.

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