Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Pnm Electric [Member]	Dec. 31, 2013 Pnm Electric [Member]	Sep. 30, 2014 Tnmp Electric [Member]	Dec. 31, 2013 Tnmp Electric [Member]
Current Assets:
Cash and cash equivalents	$ 28,424	$ 2,533	$ 625	$ 21	$ 1	$ 1
Accounts receivable, net of allowance for uncollectible accounts	105,516	90,251	78,811	70,126	26,705	20,125
Unbilled revenues	63,253	58,806	54,643	48,992	8,610	9,814
Other receivables	39,061	53,909	38,799	52,964	679	1,246
Affiliate receivables			9,572	10,054
Materials, supplies, and fuel stock	63,637	67,223	60,731	64,520	2,906	2,703
Regulatory assets	41,606	24,416	38,328	19,394	3,278	5,022
Commodity derivative instruments	4,148	4,064	4,148	4,064
Income taxes receivable	6,723	7,066	6,797	4,030
Current portion of accumulated deferred income taxes	58,681	58,681	43,826	43,827	6,501	6,501
Other current assets	55,277	34,590	49,533	30,510	1,672	980
Total current assets	466,326	401,539	385,813	348,502	50,352	46,392
Other Property and Investments:
Investment in PVNGS lessor notes	9,775	32,200	9,775	32,200
Available-for-sale securities	235,894	226,855	235,894	226,855
Other investments	1,667	1,835	300	445	245	245
Non-utility property	4,060	4,353	752	976	2,240	2,240
Total other property and investments	251,396	265,243	246,721	260,476	2,485	2,485
Utility Plant:
Plant in service and plant held for future use	5,754,564	5,563,061	4,460,035	4,314,016	1,127,872	1,074,193
Less accumulated depreciation and amortization	1,913,361	1,838,832	1,469,375	1,402,531	369,426	352,105
Net plant in service and plant held for future use	3,841,203	3,724,229	2,990,660	2,911,485	758,446	722,088
Construction work in progress	211,472	132,080	167,180	107,344	36,841	16,790
Nuclear fuel, net of accumulated amortization	81,840	77,602	81,840	77,602
Net utility plant	4,134,515	3,933,911	3,239,680	3,096,431	795,287	738,878
Deferred Charges and Other Assets:
Regulatory assets	479,138	523,955	347,642	384,217	131,496	139,738
Goodwill	278,297	278,297	51,632	51,632	226,665	226,665
Commodity derivative instruments	1,084	3,002	1,084	3,002
Other deferred charges	98,453	94,263	85,902	83,356	10,260	8,273
Total deferred charges and other assets	856,972	899,517	486,260	522,207	368,421	374,676
Total assets	5,709,209	5,500,210	4,358,474	4,227,616	1,216,545	1,162,431
Current Liabilities:
Short-term debt	100,000	149,200	0	49,200
Short-term debt - affiliate			6,500	32,500
Short-term debt – affiliate					19,100	29,400
Current installments of long-term debt	333,066	75,000	214,300	75,000
Accounts payable	102,656	109,666	83,741	84,643	9,584	12,543
Affiliate payables			14,692	20,498	1,758	3,181
Customer deposits	12,483	13,456	12,483	13,456
Accrued interest and taxes	82,052	49,600	51,188	27,665	42,831	23,778
Regulatory liabilities	1,126	1,081	1,126	1,081
Commodity derivative instruments	1,370	2,699	1,370	2,699
Dividends declared	14,868	14,864	132	132
Other current liabilities	52,671	77,105	35,576	50,392	2,491	8,999
Total current liabilities	700,292	492,671	421,108	357,266	75,764	77,901
Long-term Debt	1,542,106	1,670,420	1,176,347	1,215,618	365,759	336,036
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	884,402	801,408	714,983	651,239	201,441	190,197
Accumulated deferred investment tax credits	24,232	25,855	24,232	25,855
Regulatory liabilities	472,054	460,649	425,062	414,611	46,992	46,038
Asset retirement obligations	102,115	96,135	101,147	95,225	831	782
Accrued pension liability and postretirement benefit cost	69,363	80,046	66,183	76,611	3,180	3,435
Commodity derivative instruments	688	1,094	688	1,094
Other deferred credits	104,270	109,805	87,264	91,340	7,283	5,111
Total deferred credits and other liabilities	1,657,124	1,574,992	1,419,559	1,355,975	259,727	245,563
Total liabilities	3,899,522	3,738,083	3,017,014	2,928,859	701,250	659,500
Commitments and Contingencies (See [Note 11])
Cumulative preferred stock of subsidiary without mandatory redemption requirements	11,529	11,529	11,529	11,529
Company common stockholders’ equity:
Common stock outstanding	1,172,876	1,178,369	1,061,776	1,061,776	64	64
Paid-in-capital					404,166	404,166
Accumulated other comprehensive income (loss), net of income taxes	(56,532)	(58,140)	(56,278)	(57,877)	(254)	(263)
Retained earnings	606,394	553,340	249,013	206,300	111,319	98,964
Total Company common stockholders' equity	1,722,738	1,673,569	1,254,511	1,210,199	515,295	502,931
Non-controlling interest in Valencia	75,420	77,029	75,420	77,029
Total equity	1,798,158	1,750,598	1,329,931	1,287,228
Total liabilities and stockholders' equity	$ 5,709,209	$ 5,500,210	$ 4,358,474	$ 4,227,616	$ 1,216,545	$ 1,162,431