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Construction Program and Jointly-Owned Electric Generating Plants (Details) $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2024 MW	Jan. 31, 2023 MW	Dec. 31, 2023 USD ($) generatingUnit	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			$ 1,075,812	$ 912,557	$ 935,016
Plant in Service			9,701,180	9,164,564
Accumulated Depreciation			2,755,823	2,659,952
PNM
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			565,080	433,459	602,180
Plant in Service			6,151,510	6,007,464
Accumulated Depreciation			1,976,657	1,908,644
TNMP
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			464,436	449,534	$ 311,909
Plant in Service			3,210,870	2,853,130
Accumulated Depreciation			582,140	$ 578,157
Joint Projects | PNM
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			565,100
Joint Projects | TNMP
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			464,400
Joint Projects | PNMR
Jointly Owned Utility Plant Interests [Line Items]
Construction expenditures			1,075,800
Palo Verde Nuclear Generating Station | PNM
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service			800,338
Accumulated Depreciation			403,531
Construction Work in Progress			$ 25,380
Composite Interest		7.60%	7.56%	10.20%
Number of units (in generating units) | generatingUnit			3
Leased capacity | MW		104
Palo Verde Nuclear Generating Station | PNM | Subsequent Event
Jointly Owned Utility Plant Interests [Line Items]
Composite Interest	7.30%
Leased capacity | MW	10
Four Corners Units 4 and 5 (Coal) | PNM
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service			$ 282,875
Accumulated Depreciation			102,520
Construction Work in Progress			$ 7,710
Composite Interest			13.00%
Luna (Gas) | PNM
Jointly Owned Utility Plant Interests [Line Items]
Plant in Service			$ 85,516
Accumulated Depreciation			34,893
Construction Work in Progress			$ 2,826
Composite Interest			33.33%
Four Corners | PNM
Jointly Owned Utility Plant Interests [Line Items]
Number of units (in generating units) | generatingUnit			2

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