Consolidated Statements of Cash Flows - TNMP - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	$ 341,123	$ 320,210	$ 314,668
Deferred income tax expense	24,533	30,747	20,405
Changes in certain assets and liabilities:
Accounts receivable and unbilled revenues	(73,099)	(25,924)	(42,035)
Materials, supplies, and fuel stock	(8,528)	1,356	11,512
Other current assets	17,159	1,838	(8,135)
Other assets	5,002	31,135	29,923
Accounts payable	47,568	10,640	7,403
Accrued interest and taxes	9,205	2,692	(9,347)
Other current liabilities	(28,516)	6,894	23,740
Other liabilities	(27,935)	(29,592)	(29,633)
Net cash flows from operating activities	567,284	547,873	485,700
Cash Flows From Investing Activities:
Additions to utility and non-utility plant	(912,557)	(935,016)	(679,028)
Net cash flows used in investing activities	(950,347)	(952,258)	(733,799)
Cash Flows From Financing Activities:
Revolving credit facilities borrowings (repayments), net	169,300	30,700	(153,100)
Long-term borrowings	558,000	1,816,345	1,267,845
Transmission interconnection and security deposit arrangements	96,550	80,558	11,452
Refunds paid under transmission interconnection arrangements	(107,397)	(10,195)	(5,905)
Dividends paid	(119,839)	(112,972)	(98,502)
Debt issuance costs and other, net	(5,564)	(6,306)	(4,943)
Net cash flows from financing activities	386,037	357,561	292,194
Change in Cash and Cash Equivalents	2,974	(46,824)	44,095
Cash and Cash Equivalents at Beginning of Year	1,104	47,928	3,833
Cash and Cash Equivalents at End of Year	4,078	1,104	47,928
Supplemental Cash Flow Disclosures:
Interest paid, net of amounts capitalized	118,485	91,276	106,575
Income taxes paid (refunded), net	(1,011)	1,042	969
Supplemental schedule of noncash investing and financing activities:
(Increase) decrease in accrued plant additions	4,455	7,362	(58,796)
Texas-New Mexico Power Company
Cash Flows From Operating Activities:
Net earnings	92,267	63,879	58,585
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	99,165	91,331	89,010
Deferred income tax expense	(4,556)	(253)	(7,773)
Allowance for equity funds used during construction and other, net	(4,477)	(3,291)	(4,305)
Changes in certain assets and liabilities:
Accounts receivable and unbilled revenues	(12,356)	(1,167)	(695)
Materials, supplies, and fuel stock	(3,723)	(1,175)	(241)
Other current assets	(264)	(6,132)	(1,291)
Other assets	3,834	6,989	8,553
Accounts payable	195	338	1,607
Accrued interest and taxes	14,667	(1,533)	(530)
Other current liabilities	11,952	620	2,518
Other liabilities	(1,757)	5,545	2,135
Net cash flows from operating activities	194,947	155,151	147,573
Cash Flows From Investing Activities:
Additions to utility and non-utility plant	(449,534)	(311,909)	(321,505)
Net cash flows used in investing activities	(449,534)	(311,909)	(321,505)
Cash Flows From Financing Activities:
Revolving credit facilities borrowings (repayments), net	36,300	400	(15,000)
Long-term borrowings	160,000	65,000	185,000
Transmission interconnection and security deposit arrangements	6,400	32,700	7,402
Refunds paid under transmission interconnection arrangements	(14,150)	(7,302)	0
Equity contribution from parent	68,000	52,000	71,000
Dividends paid	0	0	(58,534)
Debt issuance costs and other, net	(1,963)	(840)	(2,136)
Net cash flows from financing activities	254,587	141,958	187,732
Change in Cash and Cash Equivalents	0	(14,800)	13,800
Cash and Cash Equivalents at Beginning of Year	0	14,800	1,000
Cash and Cash Equivalents at End of Year	0	0	14,800
Supplemental Cash Flow Disclosures:
Interest paid, net of amounts capitalized	33,974	31,599	28,114
Income taxes paid (refunded), net	9,245	13,735	16,790
Supplemental schedule of noncash investing and financing activities:
(Increase) decrease in accrued plant additions	$ 9,131	$ (9,131)	$ (11,415)