Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Electric Operating Revenues	$ 1,445,003	$ 1,362,951	$ 1,439,082
Operating Expenses:
Cost of energy	407,479	380,596	464,649
Administrative and general	186,345	191,514	179,100
Energy production costs	137,450	146,187	176,752
Regulatory disallowances and restructuring costs	27,036	15,011	167,471
Depreciation and amortization	231,942	209,110	185,919
Transmission and distribution costs	71,576	66,227	69,157
Taxes other than income taxes	76,690	76,321	71,684
Total operating expenses	1,138,518	1,084,966	1,314,732
Operating income	306,485	277,985	124,350
Other Income and Deductions:
Interest income	15,916	22,293	6,498
Gains on available-for-sale securities	27,161	19,517	16,060
Other income	19,515	17,796	26,833
Other (deductions)	(15,693)	(13,784)	(12,728)
Net other income and deductions	46,899	45,822	36,663
Interest Charges	127,625	128,633	114,860
Earnings before Income Taxes	225,759	195,174	46,153
Income Taxes	130,340	63,278	15,075
Net Earnings	95,419	131,896	31,078
(Earnings) Attributable to Valencia Non-controlling Interest	(15,017)	(14,519)	(14,910)
Preferred Stock Dividend Requirements of Subsidiary	(528)	(528)	(528)
Net Earnings Attributable to Company	79,874	116,849	15,640
Net Earnings (Loss) Available for PNM Common Stock	$ 79,874	$ 116,849	$ 15,640
Net Earnings Attributable to PNMR per Common Share:
Basic (in dollars per share)	$ 1.00	$ 1.47	$ 0.20
Diluted (in dollars per share)	$ 1.00	$ 1.46	$ 0.20
Public Service Company of New Mexico
Electric Operating Revenues	$ 1,104,230	$ 1,035,913	$ 1,131,195
Operating Expenses:
Cost of energy	321,677	299,714	391,131
Administrative and general	172,446	169,209	161,953
Energy production costs	137,450	146,187	176,752
Regulatory disallowances and restructuring costs	27,036	15,011	167,471
Depreciation and amortization	147,017	133,447	115,717
Transmission and distribution costs	42,370	39,657	43,642
Taxes other than income taxes	43,709	44,598	41,149
Total operating expenses	891,705	847,823	1,097,815
Operating income	212,525	188,090	33,380
Other Income and Deductions:
Interest income	8,454	10,173	6,574
Gains on available-for-sale securities	27,161	19,517	16,060
Other income	13,527	12,088	19,347
Other (deductions)	(10,002)	(9,539)	(8,493)
Net other income and deductions	39,140	32,239	33,488
Interest Charges	82,697	87,469	79,950
Earnings before Income Taxes	168,968	132,860	(13,082)
Income Taxes	81,555	40,922	(12,758)
Net Earnings	87,413	91,938	(324)
(Earnings) Attributable to Valencia Non-controlling Interest	(15,017)	(14,519)	(14,910)
Preferred Stock Dividend Requirements of Subsidiary	(528)	(528)	(528)
Net Earnings Attributable to Company	72,396	77,419	(15,234)
Net Earnings (Loss) Available for PNM Common Stock	71,868	76,891	(15,762)
Texas-New Mexico Power Company
Electric Operating Revenues	340,773	327,038	307,887
Operating Expenses:
Cost of energy	85,802	80,882	73,518
Administrative and general	39,828	39,423	36,755
Depreciation and amortization	63,146	61,126	56,285
Transmission and distribution costs	29,206	26,570	25,515
Taxes other than income taxes	29,187	27,396	25,781
Total operating expenses	247,169	235,397	217,854
Operating income	93,604	91,641	90,033
Other Income and Deductions:
Other income	4,994	4,629	4,240
Other (deductions)	(1,443)	(1,427)	(504)
Net other income and deductions	3,551	3,202	3,736
Interest Charges	30,084	29,335	27,681
Earnings before Income Taxes	67,071	65,508	66,088
Income Taxes	31,512	23,836	24,125
Net Earnings Attributable to Company	$ 35,559	$ 41,672	$ 41,963