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Quarterly Operating Results (Unaudited) (Details) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares MW	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Sep. 30, 2017 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares MW	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 16, 2015 MW	Jul. 31, 2015 MW
Segment Reporting Information [Line Items]
Operating Revenues									$ 1,436,613	$ 1,445,003	$ 1,362,951
Operating income	$ (17,404)	$ 127,990	$ 79,329	$ 46,132	$ 22,936	$ 142,484	$ 85,105	$ 55,960	236,047	315,039	284,725
Net earnings (loss)	(51,539)	91,573	42,449	18,799	(50,585)	78,327	41,231	26,446	$ 101,282	$ 95,419	$ 131,896
Net Earnings Attributable to PNMR	$ (55,077)	$ 87,521	$ 38,208	$ 14,990	$ (54,282)	$ 73,739	$ 37,555	$ 22,862
Net Earnings Attributable to PNMR per Common Share:
Basic (in dollars per share) | $ / shares	$ (0.70)	$ 1.10	$ 0.48	$ 0.19	$ (0.68)	$ 0.92	$ 0.47	$ 0.29	$ 1.07	$ 1.00	$ 1.47
Diluted (in dollars per share) | $ / shares	$ (0.69)	$ 1.09	$ 0.48	$ 0.19	$ (0.68)	$ 0.92	$ 0.47	$ 0.29	$ 1.07	$ 1.00	$ 1.46
Federal income tax rate change									$ 2,914	$ 57,461	$ 0
Public Service Company of New Mexico
Segment Reporting Information [Line Items]
Operating Revenues									1,091,965	1,104,230	1,035,913
Operating income	$ (38,654)	$ 102,516	$ 52,879	$ 28,292	$ 1,778	$ 113,252	$ 59,164	$ 38,331	145,033	221,079	194,830
Net earnings (loss)	(53,400)	81,428	30,781	11,514	(28,456)	65,283	30,476	20,110	70,323	87,413	91,938
Net Earnings Attributable to PNMR	(56,806)	77,508	26,672	7,837	(32,021)	60,827	26,932	16,658	55,211	72,396	77,419
Net Earnings Attributable to PNMR per Common Share:
Federal income tax rate change									(683)	29,606	0
Texas-New Mexico Power Company
Segment Reporting Information [Line Items]
Operating Revenues									344,648	340,773	327,038
Operating income	23,312	27,824	26,829	18,532	19,879	29,474	26,286	17,965	96,497	93,604	91,641
Net Earnings Attributable to PNMR	10,711	16,100	15,367	9,413	1,024	14,727	12,204	7,604	51,591	35,559	41,672
Net Earnings Attributable to PNMR per Common Share:
Federal income tax rate change									0	7,865	0
NMPRC
Net Earnings Attributable to PNMR per Common Share:
Pre-tax regulatory disallowance					27,900					27,900
Electricity
Segment Reporting Information [Line Items]
Operating Revenues	343,756	422,666	352,313	317,878	332,605	419,900	362,320	330,178	1,436,613	$ 1,445,003	$ 1,362,951
Electricity | Public Service Company of New Mexico
Segment Reporting Information [Line Items]
Operating Revenues	259,848	331,374	264,511	236,232	249,321	327,254	276,097	251,558
Electricity | Texas-New Mexico Power Company
Segment Reporting Information [Line Items]
Operating Revenues	$ 83,908	$ 91,292	$ 87,802	$ 81,646	$ 83,284	$ 92,646	$ 86,223	$ 78,620
Clean Air Act, SNCR | San Juan Generating Station Unit 4 | Public Service Company of New Mexico
Net Earnings Attributable to PNMR per Common Share:
Regulatory disallowance and restructuring costs									$ 63,300
Additional ownership to be obtained (in megawatts) | MW	65								65			65	132
Potential acquisition of ownership (in megawatts) | MW	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

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