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Construction Program and Jointly-Owned Electric Generating Plants - Schedule of Interests and Investments in Jointly-Owned Generating Facilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Jan. 31, 2024	Dec. 31, 2023
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 10,697,774		$ 9,701,180
Accumulated depreciation	2,829,296		2,755,823
PNM
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	6,797,493		6,151,510
Accumulated depreciation	2,079,363		$ 1,976,657
PVNGS (Nuclear) | PNM
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	800,999
Accumulated depreciation	415,747
Construction Work in Progress	$ 32,650
Composite Interest	7.29%	7.30%	7.60%
Four Corners Units 4 and 5 (Coal) | PNM
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 291,355
Accumulated depreciation	98,049
Construction Work in Progress	$ 14,579
Composite Interest	13.00%
Luna (Gas) | PNM
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service	$ 99,479
Accumulated depreciation	37,448
Construction Work in Progress	$ 2,658
Composite Interest	33.33%

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The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 360
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 10.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1

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