Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 15,091	$ 15,404
Accounts receivable, net of allowance for uncollectible accounts of $0 and $11,178 for PNMR and $0 and $1,483 for PNM	87,794	97,245
Unbilled revenues	57,401	71,453
Other receivables	71,069	60,562
Materials, supplies, and fuel stock	54,231	52,479
Regulatory assets	44,993	36,292
Commodity derivative instruments	3,713	15,999
Income taxes receivable	95,130	97,450
Current portion of accumulated deferred income taxes	0	886
Other current assets	33,397	96,110
Total current assets	462,819	543,880
Other Property and Investments:
Investment in PVNGS lessor notes	79,049	103,871
Investments held by NDT	168,851	156,922
Other investments	12,207	18,791
Non-utility property, net of accumulated depreciation of $0 and $2,307 for PNMR	4,631	7,333
Total other property and investments	264,738	286,917
Utility Plant:
Plant in service and plant held for future use	5,120,167	4,860,614
Less accumulated depreciation and amortization	1,705,520	1,626,693
Net plant in service and plant held for future use	3,414,647	3,233,921
Construction work in progress	132,420	137,622
Nuclear fuel, net of accumulated amortization of $0 and $26,247 for PNMR and PNM	80,067	72,901
Net utility plant	3,627,134	3,444,444
Deferred Charges and Other Assets:
Regulatory assets	482,155	502,467
Goodwill	278,297	321,310
Other intangible assets, net of accumulated amortization of $0 and $5,414 for PNMR	0	26,425
Commodity derivative instruments	0	5,264
Other deferred charges	89,470	94,376
Total deferred charges and other assets	849,922	949,842
Total Assets	5,204,613	5,225,083
Current Liabilities:
Short-term debt	82,700	222,000
Current installments of long-term debt	2,387	2,252
Accounts payable	103,139	95,969
Accrued interest and taxes	53,114	47,783
Commodity derivative instruments	1,632	31,407
Dividends declared	10,089	11,565
Current portion of accumulated deferred income taxes	9,080	0
Other current liabilities	111,127	109,148
Total current liabilities	373,268	520,124
Long-term Debt	1,671,626	1,563,595
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	645,099	540,106
Accumulated deferred investment tax credits	15,771	18,089
Regulatory liabilities	418,098	342,465
Asset retirement obligations	79,233	76,637
Accrued pension liability and postretirement benefit cost	224,766	270,172
Commodity derivative instruments	2,437	12,831
Other deferred credits	106,378	147,616
Total deferred credits and other liabilities	1,491,782	1,407,916
Total liabilities	3,536,676	3,491,635
Commitments and Contingencies (See Note 16)
Cumulative preferred stock of subsidiary without mandatory redemption requirements ($100 stated value, 10,000,000 shares authorized: issued and outstanding 115,293 shares)	11,529	11,529
Equity:
Company Convertible Preferred Stock, Series A without mandatory redemption requirements	0	100,000
Company common stockholders’ equity:
Common stock outstanding	1,193,191	1,290,465
Accumulated other comprehensive income (loss), net of income taxes	(66,856)	(68,666)
Retained earnings	447,650	314,943
Total PNMR common stockholders' equity	1,573,985	1,536,742
Non-controlling interest in Valencia	82,423	85,177
Total equity	1,656,408	1,721,919
Total liabilities and stockholders' equity	5,204,613	5,225,083
Public Service Company of New Mexico [Member]
Current Assets:
Cash and cash equivalents	12,307	10,336
Accounts receivable, net of allowance for uncollectible accounts of $0 and $11,178 for PNMR and $0 and $1,483 for PNM	68,661	58,785
Unbilled revenues	48,928	39,053
Other receivables	65,465	56,951
Affiliate receivables	8,912	8,605
Materials, supplies, and fuel stock	51,521	49,454
Regulatory assets	44,480	35,835
Commodity derivative instruments	3,713	1,443
Income taxes receivable	128,858	76,941
Other current assets	26,776	46,635
Total current assets	459,621	384,038
Other Property and Investments:
Investment in PVNGS lessor notes	79,049	103,871
Investments held by NDT	168,851	156,922
Other investments	2,900	5,068
Non-utility property, net of accumulated depreciation of $0 and $2,307 for PNMR	976	976
Total other property and investments	251,776	266,837
Utility Plant:
Plant in service and plant held for future use	4,009,873	3,818,722
Less accumulated depreciation and amortization	1,305,754	1,259,957
Net plant in service and plant held for future use	2,704,119	2,558,765
Construction work in progress	116,030	115,628
Nuclear fuel, net of accumulated amortization of $0 and $26,247 for PNMR and PNM	80,067	72,901
Net utility plant	2,900,216	2,747,294
Deferred Charges and Other Assets:
Regulatory assets	352,387	357,944
Goodwill	51,632	51,632
Other deferred charges	79,655	67,828
Total deferred charges and other assets	483,674	477,404
Total Assets	4,095,287	3,875,573
Current Liabilities:
Short-term debt	66,000	190,000
Current installments of long-term debt	0	0
Accounts payable	82,619	51,931
Affiliate payables	14,592	8,528
Accrued interest and taxes	32,111	25,773
Commodity derivative instruments	1,632	3,110
Dividends declared	132	39,254
Current portion of accumulated deferred income taxes	16,562	9,783
Other current liabilities	76,915	66,582
Total current liabilities	290,563	394,961
Long-term Debt	1,215,540	1,055,748
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	504,419	446,657
Accumulated deferred investment tax credits	15,771	18,089
Regulatory liabilities	373,703	299,763
Asset retirement obligations	78,425	75,888
Accrued pension liability and postretirement benefit cost	213,688	253,948
Commodity derivative instruments	2,437	2,009
Other deferred credits	94,700	108,455
Total deferred credits and other liabilities	1,283,143	1,204,809
Total liabilities	2,789,246	2,655,518
Commitments and Contingencies (See Note 16)
Cumulative preferred stock of subsidiary without mandatory redemption requirements ($100 stated value, 10,000,000 shares authorized: issued and outstanding 115,293 shares)	11,529	11,529
Company common stockholders’ equity:
Common stock outstanding	1,061,776	1,018,776
Accumulated other comprehensive income (loss), net of income taxes	(66,798)	(66,786)
Retained earnings	217,111	171,359
Total PNMR common stockholders' equity	1,212,089	1,123,349
Non-controlling interest in Valencia	82,423	85,177
Total equity	1,294,512	1,208,526
Total liabilities and stockholders' equity	4,095,287	3,875,573
Texas-New Mexico Power Company [Member]
Current Assets:
Cash and cash equivalents	1	1
Accounts receivable, net of allowance for uncollectible accounts of $0 and $11,178 for PNMR and $0 and $1,483 for PNM	19,133	12,742
Unbilled revenues	8,473	5,734
Other receivables	847	1,677
Affiliate receivables	0	3,956
Materials, supplies, and fuel stock	2,710	2,787
Regulatory assets	513	457
Current portion of accumulated deferred income taxes	2,272	1,876
Other current assets	694	618
Total current assets	34,643	29,848
Other Property and Investments:
Other investments	271	282
Non-utility property, net of accumulated depreciation of $0 and $2,307 for PNMR	2,240	2,244
Total other property and investments	2,511	2,526
Utility Plant:
Plant in service and plant held for future use	947,327	885,325
Less accumulated depreciation and amortization	323,123	302,333
Net plant in service and plant held for future use	624,204	582,992
Construction work in progress	12,968	12,375
Net utility plant	637,172	595,367
Deferred Charges and Other Assets:
Regulatory assets	129,768	144,522
Goodwill	226,665	226,665
Other deferred charges	6,686	12,029
Total deferred charges and other assets	363,119	383,216
Total Assets	1,037,445	1,010,957
Current Liabilities:
Short-term debt – affiliate	700	1,200
Current installments of long-term debt	0	0
Accounts payable	12,263	5,537
Affiliate payables	1,314	1,015
Accrued interest and taxes	20,666	23,185
Other current liabilities	9,480	3,292
Total current liabilities	44,423	34,229
Long-term Debt	310,963	310,337
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	159,197	142,121
Regulatory liabilities	44,395	42,702
Asset retirement obligations	699	648
Accrued pension liability and postretirement benefit cost	11,078	16,224
Other deferred credits	3,437	11,413
Total deferred credits and other liabilities	218,806	213,108
Total liabilities	574,192	557,674
Commitments and Contingencies (See Note 16)
Company common stockholders’ equity:
Common stock outstanding	64	64
Paid-in-capital	416,394	430,108
Accumulated other comprehensive income (loss), net of income taxes	(58)	(1,485)
Retained earnings	46,853	24,596
Total PNMR common stockholders' equity	463,253	453,283
Total liabilities and stockholders' equity	$ 1,037,445	$ 1,010,957