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Construction Program and Jointly-Owned Electric Generating Plants - Narrative (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2024 MW	Jan. 31, 2023 MW	Dec. 31, 2024 USD ($) generatingUnit	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			$ 1,247,041	$ 1,075,812	$ 912,557
PNM
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			682,412	565,080	433,459
TNMP
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			541,604	$ 464,436	$ 449,534
Joint Projects | PNM
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			682,400
Joint Projects | TNMP
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			541,600
Joint Projects | TXNM
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			$ 1,247,000
PVNGS (Nuclear) | PNM
Jointly Owned Utility Plant Interests [Line Items]
Number of units (in generating units) | generatingUnit			3
Composite Interest	7.30%		7.29%	7.60%
Leased capacity | MW	10	104
PVNGS, Unit One | PNM
Jointly Owned Utility Plant Interests [Line Items]
Composite Interest			2.30%
PVNGS, Unit Two | PNM
Jointly Owned Utility Plant Interests [Line Items]
Composite Interest			9.40%
PVNGS, Unit Three | PNM
Jointly Owned Utility Plant Interests [Line Items]
Composite Interest			10.20%
Four Corners | PNM
Jointly Owned Utility Plant Interests [Line Items]
Number of units (in generating units) | generatingUnit			2
Four Corners Units 4 and 5 (Coal) | PNM
Jointly Owned Utility Plant Interests [Line Items]
Composite Interest			13.00%

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

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