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Quarterly Operating Results (Unaudited) (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares MW	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares MW	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2015 MW
Segment Reporting Information [Line Items]
Operating Revenues	$ 344,144	$ 433,586	$ 330,228	$ 349,645	$ 343,756	$ 422,666	$ 352,313	$ 317,878	$ 1,457,603	$ 1,436,613	$ 1,445,003
Operating income (loss)	60,552	140,540	(93,615)	36,723	(17,404)	127,990	79,329	46,132	144,200	236,047	315,039
Net earnings (loss)	35,989	106,763	(72,283)	21,662	(51,539)	91,573	42,449	18,799	$ 92,131	$ 101,282	$ 95,419
Net Earnings Attributable to PNMR	$ 31,805	$ 102,771	$ (75,914)	$ 18,700	$ (55,077)	$ 87,521	$ 38,208	$ 14,990
Net Earnings Attributable to PNMR per Common Share:
Basic (in dollars per share) | $ / shares	$ 0.40	$ 1.29	$ (0.95)	$ 0.23	$ (0.70)	$ 1.10	$ 0.48	$ 0.19	$ 0.97	$ 1.07	$ 1.00
Diluted (in dollars per share) | $ / shares	$ 0.40	$ 1.28	$ (0.95)	$ 0.23	$ (0.69)	$ 1.09	$ 0.48	$ 0.19	$ 0.97	$ 1.07	$ 1.00
Income taxes (benefit)									$ (25,282)	$ 7,775	$ 130,340
Federal income tax rate change									0	2,914	57,461
Public Service Company of New Mexico
Segment Reporting Information [Line Items]
Operating Revenues	$ 255,172	$ 331,113	$ 238,219	$ 269,318	$ 259,848	$ 331,374	$ 264,511	$ 236,232	1,093,822	1,091,965	1,104,230
Operating income (loss)	44,299	108,453	(115,977)	24,293	(38,654)	102,516	52,879	28,292	61,068	145,033	221,079
Net earnings (loss)	32,040	84,721	(83,313)	21,974	(53,400)	81,428	30,781	11,514	55,422	70,323	87,413
Net Earnings Attributable to PNMR	27,988	80,861	(86,812)	19,144	(56,806)	77,508	26,672	7,837	41,181	55,211	72,396
Net Earnings Attributable to PNMR per Common Share:
Income taxes (benefit)									(25,962)	(5,971)	81,555
Federal income tax rate change									0	(683)	29,606
Texas-New Mexico Power Company
Segment Reporting Information [Line Items]
Operating Revenues	88,972	102,473	92,009	80,327	83,908	91,292	87,802	81,646	363,781	344,648	340,773
Operating income (loss)	18,055	32,596	22,578	12,585	23,312	27,824	26,829	18,532	85,814	96,497	93,604
Net Earnings Attributable to PNMR	11,347	$ 25,087	$ 15,267	$ 4,098	10,711	$ 16,100	$ 15,367	$ 9,413	55,799	51,591	35,559
Net Earnings Attributable to PNMR per Common Share:
Income taxes (benefit)									5,046	16,880	31,512
Federal income tax rate change									0	0	7,865
Electricity
Segment Reporting Information [Line Items]
Operating Revenues									1,457,603	1,436,613	$ 1,445,003
Clean Air Act, SNCR | San Juan Generating Station Unit 4 | Public Service Company of New Mexico
Net Earnings Attributable to PNMR per Common Share:
Pre-tax impairment of investments					$ 35,000					35,000
Regulatory disallowance and restructuring costs										$ 63,300
Additional ownership to be obtained (in megawatts) | MW												132
Potential acquisition of ownership (in megawatts) | MW					65					65		65
Clean Air Act, SNCR Hearing Examiner Recommended Denial | San Juan Generating Station Unit 4 | Public Service Company of New Mexico
Net Earnings Attributable to PNMR per Common Share:
Additional ownership to be obtained (in megawatts) | MW					132					132		132
New Mexico 2015 Rate Case | Public Service Company of New Mexico
Net Earnings Attributable to PNMR per Common Share:
Pre-tax impairment of investments	$ 150,600								150,600
Income taxes (benefit)									$ 45,700

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