Schedule I - Condensed Financial Information of Parent Company (Statement of Cash flow) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities:
Net earnings (loss)	$ 116,254us-gaap_NetIncomeLoss	$ 100,507us-gaap_NetIncomeLoss	$ 105,547us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	209,867	208,173	206,499
Deferred income tax expense	72,481us-gaap_DeferredIncomeTaxExpenseBenefit	60,430us-gaap_DeferredIncomeTaxExpenseBenefit	56,243us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on reacquired debt	0	3,253	0
Stock based compensation expense	5,931us-gaap_ShareBasedCompensation	5,320us-gaap_ShareBasedCompensation	3,585us-gaap_ShareBasedCompensation
Changes in certain assets and liabilities:
Other current assets	(30,436)	8,577	(2,598)
Other assets	290	(12,801)	(30,778)
Accounts payable	(2,311)	4,484	14,020
Accrued interest and taxes	2,040	91,537	255
Other current liabilities	(2,453)	(19,648)	(19,905)
Other liabilities	45,516	(61,262)	(70,743)
Net cash flows from operating activities	414,876	386,587	281,349
Cash Flows From Investing Activities:
Utility plant additions	(460,658)	(348,039)	(308,909)
Net cash flows from investing activities	(485,329)	(331,446)	(285,895)
Cash Flows From Financing Activities:
Short-term borrowings (repayments), net	(43,600)	(9,500)	(24,000)
Repayment of long-term debt	(125,000)us-gaap_RepaymentsOfLongTermDebt	(29,468)us-gaap_RepaymentsOfLongTermDebt	(22,387)us-gaap_RepaymentsOfLongTermDebt
Proceeds from stock option exercise	6,999	4,618	11,684
Dividends paid	(59,468)us-gaap_PaymentsOfOrdinaryDividends	(51,508)us-gaap_PaymentsOfOrdinaryDividends	(45,137)us-gaap_PaymentsOfOrdinaryDividends
Other, net	(2,808)	(5,545)	(922)
Net cash flows from financing activities	96,194	(61,593)	(1,560)
Change in Cash and Cash Equivalents	25,741	(6,452)	(6,106)
Cash and Cash Equivalents at Beginning of Year	2,533	8,985	15,091
Cash and Cash Equivalents at End of Year	28,274	2,533	8,985
Supplemental Cash Flow Disclosures:
Interest paid	108,741us-gaap_InterestPaidNet	110,768us-gaap_InterestPaidNet	113,265us-gaap_InterestPaidNet
Income taxes paid (refunded), net	(2,597)us-gaap_IncomeTaxesPaidNet	(95,327)us-gaap_IncomeTaxesPaidNet	5,302us-gaap_IncomeTaxesPaidNet
PNM Resources [Member]
Cash Flows From Operating Activities:
Net earnings (loss)	116,254	100,507	105,547
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	680	4,192	5,000
Deferred income tax expense	(69,442)	(51,820)	(46,632)
Equity in (earnings) loss of subsidiaries	(124,543)	(116,634)	(117,900)
Loss on reacquired debt	0	3,253	0
Stock based compensation expense	5,931	5,320	3,585
Changes in certain assets and liabilities:
Other current assets	22,955	28,460	(43,638)
Other assets	51,644	46,558	34,096
Accounts payable	(88)	620	8
Accrued interest and taxes	(7,683)	(9,266)	(28,855)
Other current liabilities	(1,668)	(146)	3,876
Other liabilities	28,704	(27,756)	(29,601)
Net cash flows from operating activities	22,744	(16,712)	(114,514)
Cash Flows From Investing Activities:
Utility plant additions	(474)	(960)	(7,524)
Investments in subsidiaries	0	(13,800)	0
Cash dividends from subsidiaries	46,599	158,772	61,406
Net cash flows from investing activities	46,125	144,012	53,882
Cash Flows From Financing Activities:
Short-term borrowings (repayments), net	600	(37,600)	120,900
Repayment of long-term debt	0	(29,468)	(2,387)
Proceeds from stock option exercise	6,999	4,618	11,684
Purchases to satisfy awards of common stock	(17,319)	(13,807)	(25,168)
Dividends paid	(58,940)	(50,980)	(44,609)
Other, net	81	0	0
Net cash flows from financing activities	(68,579)	(127,237)	60,420
Change in Cash and Cash Equivalents	290	63	(212)
Cash and Cash Equivalents at Beginning of Year	92	29	241
Cash and Cash Equivalents at End of Year	382	92	29
Supplemental Cash Flow Disclosures:
Interest paid	12,152	14,510	15,007
Income taxes paid (refunded), net	$ (2,014)	$ 22,378	$ 1,501

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