Schedule I - Condensed Financial Information of Parent Company (Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 28,274	$ 2,533	$ 8,985	$ 15,091
Income taxes receivable	6,360us-gaap_IncomeTaxesReceivable	7,066us-gaap_IncomeTaxesReceivable
Other, net	58,471us-gaap_OtherAssetsCurrent	34,590us-gaap_OtherAssetsCurrent
Total current assets	432,817us-gaap_AssetsCurrent	401,539us-gaap_AssetsCurrent
Property, plant and equipment, net of accumulated depreciation of $10,251 and $9,167	4,270,006	3,933,911
Other long-term assets	1,762us-gaap_OtherLongTermInvestments	1,835us-gaap_OtherLongTermInvestments
Total Assets	5,829,325us-gaap_Assets	5,500,210us-gaap_Assets	5,372,583us-gaap_Assets
Liabilities and Stockholders’ Equity
Short-term debt	105,600us-gaap_ShortTermBorrowings	149,200us-gaap_ShortTermBorrowings
Current maturities of long-term debt	333,066us-gaap_LongTermDebtCurrent	75,000us-gaap_LongTermDebtCurrent
Accrued interest and taxes	53,863pnm_AccruedInterestAndTaxesPayable	49,600pnm_AccruedInterestAndTaxesPayable
Other current liabilities	70,194us-gaap_OtherLiabilitiesCurrent	77,105us-gaap_OtherLiabilitiesCurrent
Total current liabilities	704,282us-gaap_LiabilitiesCurrent	492,671us-gaap_LiabilitiesCurrent
Long-term Debt	1,642,024us-gaap_LongTermDebtNoncurrent	1,670,420us-gaap_LongTermDebtNoncurrent
Total liabilities	4,022,704us-gaap_Liabilities	3,738,083us-gaap_Liabilities
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares)	1,173,845us-gaap_CommonStockValue	1,178,369us-gaap_CommonStockValue
Accumulated other comprehensive income (loss), net of tax	(61,755)	(58,140)	(81,630)	(66,856)
Retained earnings	609,456	553,340
Total PNMR common stockholders’ equity	1,721,546us-gaap_StockholdersEquity	1,673,569us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	5,829,325	5,500,210
PNM Resources [Member]
Assets
Cash and cash equivalents	382	92	29	241
Intercompany receivables	107,619	136,387
Income taxes receivable	29	14,989
Other, net	8,115	8,544
Total current assets	116,145	160,012
Property, plant and equipment, net of accumulated depreciation of $10,251 and $9,167	27,076	26,601
Investment in subsidiaries	1,757,650	1,683,321
Other long-term assets	70,939	53,892
Total long-term assets	1,855,665	1,763,814
Total Assets	1,971,810	1,923,826
Liabilities and Stockholders’ Equity
Short-term debt	100,600	100,000
Short-term debt-affiliate	8,819	8,819
Current maturities of long-term debt	118,766	0
Accrued interest and taxes	2,816	2,797
Other current liabilities	16,320	16,876
Total current liabilities	247,321	128,492
Long-term Debt	0	118,766
Other long-term liabilities	2,943	2,999
Total liabilities	250,264	250,257
Common stock (no par value; 120,000,000 shares authorized; issued and outstanding 79,653,624 shares)	1,173,845	1,178,369
Accumulated other comprehensive income (loss), net of tax	(61,755)	(58,140)
Retained earnings	609,456	553,340
Total PNMR common stockholders’ equity	1,721,546	1,673,569
Total liabilities and stockholders' equity	$ 1,971,810	$ 1,923,826

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