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Schedule I - Condensed Financial Information of Parent Company - Statement of Cash flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities:
Net Cash Flows From Operating Activities	$ 485,700	$ 503,163	$ 428,226
Cash Flows From Investing Activities:
Net cash flows from investing activities	(733,799)	(673,898)	(475,724)
Cash Flows From Financing Activities:
Revolving credit facility borrowings (repayments), net	(153,100)	99,200	(119,500)
Long-term borrowings	1,267,845	745,000	984,652
Repayment of long-term debt	(977,845)	(407,302)	(750,162)
Issuance of common stock	283,208	0	0
Proceeds from stock option exercise	24	943	963
Dividends paid	(98,502)	(92,926)	(84,961)
Other, net	(4,943)	(2,840)	(6,846)
Net cash flows from financing activities	292,194	172,446	45,646
Change in Cash and Cash Equivalents	44,095	1,711	(1,852)
Cash and Cash Equivalents at Beginning of Year	3,833	2,122	3,974
Cash and Cash Equivalents at End of Year	47,928	3,833	2,122
Supplemental Cash Flow Disclosures:
Interest paid, net of amounts capitalized	106,575	115,476	119,308
Income taxes paid (refunded), net	969	(2,929)	842
PNM Resources
Cash Flows From Operating Activities:
Net Cash Flows From Operating Activities	(17,646)	2,001	(2,566)
Cash Flows From Investing Activities:
Utility plant additions	1,122	1,100	826
Investments in subsidiaries	(301,000)	(80,000)	(30,000)
Cash dividends from subsidiaries	99,187	54,465	129,379
Net cash flows from investing activities	(200,691)	(24,435)	100,205
Cash Flows From Financing Activities:
Short-term loan borrowings (repayments)		(150,000)	50,000
Revolving credit facility borrowings (repayments), net	(131,900)	123,900	(148,700)
Long-term borrowings	230,000	150,000	349,652
Repayment of long-term debt	(50,000)	0	(250,000)
Proceeds from stock option exercise	24	943	963
Awards of common stock	(11,984)	(9,918)	(12,635)
Dividends paid	(97,974)	(92,398)	(84,433)
Other, net	(3,064)	(107)	(2,414)
Net cash flows from financing activities	218,310	22,420	(97,567)
Change in Cash and Cash Equivalents	(27)	(14)	72
Cash and Cash Equivalents at Beginning of Year	79	93	21
Cash and Cash Equivalents at End of Year	52	79	93
Supplemental Cash Flow Disclosures:
Interest paid, net of amounts capitalized	16,869	18,702	15,450
Income taxes paid (refunded), net	$ 0	$ 0	$ 0

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