Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 46,051,000	$ 28,274,000
Accounts receivable, net of allowance for uncollectible accounts	98,699,000	87,038,000
Unbilled revenues	52,012,000	63,719,000
Other receivables	28,590,000	39,857,000
Materials, supplies, and fuel stock	67,386,000	63,628,000
Regulatory assets	1,070,000	47,855,000
Commodity derivative instruments	3,813,000	11,232,000
Income taxes receivable	5,845,000	6,360,000
Other current assets	82,104,000	58,471,000
Total current assets	385,570,000	406,434,000
Other Property and Investments:
Investment in PVNGS lessor notes	0	9,538,000
Available-for-sale securities	259,042,000	250,145,000
Other investments	604,000	1,762,000
Non-utility property	3,404,000	3,406,000
Total other property and investments	263,050,000	264,851,000
Utility Plant:
Plant in service, held for future use, and to be abandoned	6,307,261,000	5,941,581,000
Less accumulated depreciation and amortization	2,058,772,000	1,939,760,000
Net plant in service and plant held for future use	4,248,489,000	4,001,821,000
Construction work in progress	204,766,000	190,389,000
Nuclear fuel, net of accumulated amortization	82,117,000	77,796,000
Net utility plant	4,535,372,000	4,270,006,000
Deferred Charges and Other Assets:
Regulatory assets	470,664,000	491,007,000
Goodwill	278,297,000	278,297,000
Commodity derivative instruments	2,622,000	0
Other deferred charges	73,753,000	79,642,000
Total deferred charges and other assets	825,336,000	848,946,000
Total assets	6,009,328,000	5,790,237,000
Current Liabilities:
Short-term debt	250,600,000	105,600,000
Current installments of long-term debt	124,979,000	332,871,000
Accounts payable	100,419,000	110,029,000
Customer deposits	12,216,000	12,555,000
Accrued interest and taxes	58,306,000	53,863,000
Regulatory liabilities	15,591,000	1,703,000
Commodity derivative instruments	1,859,000	1,209,000
Dividends declared	17,656,000	16,063,000
Other current liabilities	59,494,000	70,194,000
Total current liabilities	641,120,000	704,087,000
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	1,966,969,000	1,629,514,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	877,393,000	864,728,000
Regulatory liabilities	467,413,000	466,143,000
Asset retirement obligations	111,895,000	104,170,000
Accrued pension liability and postretirement benefit cost	73,097,000	110,738,000
Commodity derivative instruments	0	477,000
Other deferred credits	133,692,000	103,759,000
Total deferred credits and other liabilities	1,663,490,000	1,650,015,000
Total liabilities	$ 4,271,579,000	$ 3,983,616,000
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)	$ 11,529,000	$ 11,529,000
Company common stockholders’ equity:
Common stock outstanding	1,166,465,000	1,173,845,000
Accumulated other comprehensive income (loss), net of income taxes	(71,432,000)	(61,755,000)
Retained earnings	559,780,000	609,456,000
Total PNMR common stockholders’ equity	1,654,813,000	1,721,546,000
Non-controlling interest in Valencia	71,407,000	73,546,000
Total equity	1,726,220,000	1,795,092,000
Total liabilities and stockholders' equity	6,009,328,000	5,790,237,000
Public Service Company of New Mexico [Member]
Current Assets:
Cash and cash equivalents	43,138,000	25,480,000
Accounts receivable, net of allowance for uncollectible accounts	78,291,000	67,622,000
Unbilled revenues	42,641,000	54,140,000
Other receivables	24,725,000	37,622,000
Affiliate receivables	15,105,000	8,853,000
Materials, supplies, and fuel stock	60,477,000	60,859,000
Regulatory assets	0	43,980,000
Commodity derivative instruments	3,813,000	11,232,000
Income taxes receivable	14,577,000	6,105,000
Other current assets	74,990,000	53,095,000
Total current assets	357,757,000	368,988,000
Other Property and Investments:
Investment in PVNGS lessor notes	0	9,538,000
Available-for-sale securities	259,042,000	250,145,000
Other investments	366,000	397,000
Non-utility property	96,000	96,000
Total other property and investments	259,504,000	260,176,000
Utility Plant:
Plant in service, held for future use, and to be abandoned	4,833,303,000	4,581,066,000
Less accumulated depreciation and amortization	1,569,549,000	1,486,406,000
Net plant in service and plant held for future use	3,263,754,000	3,094,660,000
Construction work in progress	172,238,000	169,673,000
Nuclear fuel, net of accumulated amortization	82,117,000	77,796,000
Net utility plant	3,518,109,000	3,342,129,000
Deferred Charges and Other Assets:
Regulatory assets	342,910,000	357,045,000
Goodwill	51,632,000	51,632,000
Commodity derivative instruments	2,622,000	0
Other deferred charges	66,810,000	73,144,000
Total deferred charges and other assets	463,974,000	481,821,000
Total assets	4,599,344,000	4,453,114,000
Current Liabilities:
Short-term debt - affiliate	0	0
Current installments of long-term debt	124,979,000	214,264,000
Accounts payable	72,386,000	86,055,000
Customer deposits	12,216,000	12,555,000
Affiliate payables	14,318,000	18,232,000
Accrued interest and taxes	33,189,000	29,298,000
Regulatory liabilities	15,591,000	1,703,000
Commodity derivative instruments	1,859,000	1,209,000
Dividends declared	132,000	132,000
Other current liabilities	42,251,000	52,053,000
Total current liabilities	316,921,000	415,501,000
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	1,455,698,000	1,268,273,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	696,384,000	703,396,000
Regulatory liabilities	434,863,000	425,481,000
Asset retirement obligations	111,049,000	103,182,000
Accrued pension liability and postretirement benefit cost	66,285,000	102,850,000
Commodity derivative instruments	0	477,000
Other deferred credits	117,275,000	86,023,000
Total deferred credits and other liabilities	1,425,856,000	1,421,409,000
Total liabilities	$ 3,198,475,000	$ 3,105,183,000
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)	$ 11,529,000	$ 11,529,000
Company common stockholders’ equity:
Common stock outstanding	1,236,776,000	1,061,776,000
Accumulated other comprehensive income (loss), net of income taxes	(71,476,000)	(61,755,000)
Retained earnings	152,633,000	262,835,000
Total PNMR common stockholders’ equity	1,317,933,000	1,262,856,000
Non-controlling interest in Valencia	71,407,000	73,546,000
Total equity	1,389,340,000	1,336,402,000
Total liabilities and stockholders' equity	4,599,344,000	4,453,114,000
Texas-New Mexico Power Company [Member]
Current Assets:
Cash and cash equivalents	1,000	1,000
Accounts receivable, net of allowance for uncollectible accounts	20,408,000	19,416,000
Unbilled revenues	9,371,000	9,579,000
Other receivables	811,000	2,063,000
Materials, supplies, and fuel stock	6,909,000	2,769,000
Regulatory assets	1,070,000	3,875,000
Other current assets	1,053,000	938,000
Total current assets	39,623,000	38,641,000
Other Property and Investments:
Other investments	238,000	242,000
Non-utility property	2,240,000	2,240,000
Total other property and investments	2,478,000	2,482,000
Utility Plant:
Plant in service, held for future use, and to be abandoned	1,285,727,000	1,182,112,000
Less accumulated depreciation and amortization	406,516,000	375,407,000
Net plant in service and plant held for future use	879,211,000	806,705,000
Construction work in progress	16,561,000	16,538,000
Net utility plant	895,772,000	823,243,000
Deferred Charges and Other Assets:
Regulatory assets	127,754,000	133,962,000
Goodwill	226,665,000	226,665,000
Other deferred charges	4,847,000	4,424,000
Total deferred charges and other assets	359,266,000	365,051,000
Total assets	1,297,139,000	1,229,417,000
Current Liabilities:
Short-term debt	59,000,000	5,000,000
Short-term debt - affiliate	11,800,000	22,700,000
Accounts payable	16,006,000	14,203,000
Affiliate payables	3,681,000	2,469,000
Accrued interest and taxes	32,891,000	28,574,000
Regulatory liabilities	0	0
Other current liabilities	2,044,000	2,271,000
Total current liabilities	125,422,000	75,217,000
Long-term Debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs	361,411,000	361,241,000
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	232,791,000	211,547,000
Regulatory liabilities	32,550,000	40,662,000
Asset retirement obligations	695,000	848,000
Accrued pension liability and postretirement benefit cost	6,812,000	7,888,000
Other deferred credits	4,078,000	7,349,000
Total deferred credits and other liabilities	276,926,000	268,294,000
Total liabilities	$ 763,759,000	$ 704,752,000
Commitments and Contingencies (See Note [16])
Company common stockholders’ equity:
Common stock outstanding	$ 64,000	$ 64,000
Paid-in-capital	404,166,000	404,166,000
Retained earnings	129,150,000	120,435,000
Total PNMR common stockholders’ equity	533,380,000	524,665,000
Total liabilities and stockholders' equity	$ 1,297,139,000	$ 1,229,417,000