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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities:
Net Cash Flows From Operating Activities	$ 503,163	$ 428,226	$ 523,462
Cash Flows From Investing Activities:
Net cash flows from investing activities	(673,898)	(475,724)	(466,163)
Cash Flows From Financing Activities:
Short-term loan borrowings (repayments)	(150,000)	50,000	0
Revolving credit facility borrowings (repayments), net	99,200	(119,500)	18,300
Long-term borrowings	745,000	984,652	317,000
Repayment of long-term debt	(407,302)	(750,162)	(274,070)
Proceeds from stock option exercise	943	963	1,739
Dividends paid	(92,926)	(84,961)	(77,792)
Other, net	(2,840)	(6,846)	(2,942)
Net cash flows from financing activities	172,446	45,646	(58,847)
Change in Cash and Cash Equivalents	1,711	(1,852)	(1,548)
Cash and Cash Equivalents at Beginning of Year	2,122	3,974	5,522
Cash and Cash Equivalents at End of Year	3,833	2,122	3,974
Supplemental Cash Flow Disclosures:
Interest paid, net of amounts capitalized	115,476	119,308	120,955
Income taxes paid (refunded), net	(2,929)	842	625
PNM Resources
Cash Flows From Operating Activities:
Net Cash Flows From Operating Activities	2,001	(2,566)	(7,814)
Cash Flows From Investing Activities:
Utility plant additions	1,100	826	(180)
Investments in subsidiaries	(80,000)	(30,000)	(50,000)
Cash dividends from subsidiaries	54,465	129,379	105,084
Net cash flows from investing activities	(24,435)	100,205	54,904
Cash Flows From Financing Activities:
Short-term loan borrowings (repayments)	(150,000)	50,000	0
Revolving credit facility borrowings (repayments), net	123,900	(148,700)	42,600
Long-term borrowings	150,000	349,652
Repayment of long-term debt	0	(250,000)	0
Proceeds from stock option exercise	943	963	1,739
Purchases to satisfy awards of common stock	(9,918)	(12,635)	(13,929)
Dividends paid	(92,398)	(84,433)	(77,264)
Other, net	(107)	(2,414)	(269)
Net cash flows from financing activities	22,420	(97,567)	(47,123)
Change in Cash and Cash Equivalents	(14)	72	(33)
Cash and Cash Equivalents at Beginning of Year	93	21	54
Cash and Cash Equivalents at End of Year	79	93	21
Supplemental Cash Flow Disclosures:
Interest paid, net of amounts capitalized	18,702	15,450	10,899
Income taxes paid (refunded), net	$ 0	$ 0	$ 0

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