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Fair Value of Derivative and Other Financial Instruments, Defined Benefit Plans Disclosure (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	$ 2,173,117	$ 1,905,230
Investment in PVNGS lessor notes	32,836	57,279
Other investments	2,375	3,196
Fair value of plan assets at end of year	657,319	623,543
Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	1,624,222	1,382,938
Investment in PVNGS lessor notes	32,836	57,279
Other investments	397	445
Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	427,356	390,814
Other investments	242	245
Cash and Cash Equivalents [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	15,645	16,281
Equity Securities, International Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	23,282	24,471
Equity Securities, Domestic Value [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	41,778	41,451
Equity Securities, Domestic Growth [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	28,370	36,805
Equity Securities, Other Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	29,719	22,522
Fixed Income Securities, Corporate [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	242,742	202,897
Fixed Income Securities, U.S. Government [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	106,634	99,748
Fixed Income Securities, Municipals [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	20,156	17,259
Fixed Income Securities, Other Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	74,136	66,286
Private Equity Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	37,220	39,122
Hedge Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	23,876	34,912
Real Estate [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	13,761	21,789
Fair Value, Inputs, Level 1 [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	0	0
Investment in PVNGS lessor notes	0	0
Other investments	639	690
Fair value of plan assets at end of year	138,491	164,021
Fair Value, Inputs, Level 1 [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	0	0
Investment in PVNGS lessor notes	0	0
Other investments	397	445
Fair Value, Inputs, Level 1 [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	0	0
Other investments	242	245
Fair Value, Inputs, Level 1 [Member] \| Cash and Cash Equivalents [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	15,645	16,281
Fair Value, Inputs, Level 1 [Member] \| Equity Securities, International Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	24,471
Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Domestic Value [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	41,778	41,451
Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Domestic Growth [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	28,370	36,805
Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Other Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 1 [Member] \| Fixed Income Securities, Corporate [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	363
Fair Value, Inputs, Level 1 [Member] \| Fixed Income Securities, U.S. Government [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	52,537	44,541
Fair Value, Inputs, Level 1 [Member] \| Fixed Income Securities, Municipals [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 1 [Member] \| Fixed Income Securities, Other Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	161	109
Fair Value, Inputs, Level 1 [Member] \| Private Equity Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 1 [Member] \| Hedge Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 1 [Member] \| Real Estate [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 2 [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	2,173,117	1,905,230
Investment in PVNGS lessor notes	0	0
Other investments	0	0
Fair value of plan assets at end of year	443,244	363,523
Fair Value, Inputs, Level 2 [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	1,624,222	1,382,938
Investment in PVNGS lessor notes	0	0
Other investments	0	0
Fair Value, Inputs, Level 2 [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	427,356	390,814
Other investments	0	0
Fair Value, Inputs, Level 2 [Member] \| Cash and Cash Equivalents [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 2 [Member] \| Equity Securities, International Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	23,282	0
Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Domestic Value [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Domestic Growth [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Other Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	29,719	22,522
Fair Value, Inputs, Level 2 [Member] \| Fixed Income Securities, Corporate [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	242,015	202,358
Fair Value, Inputs, Level 2 [Member] \| Fixed Income Securities, U.S. Government [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	54,097	55,207
Fair Value, Inputs, Level 2 [Member] \| Fixed Income Securities, Municipals [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	20,156	17,259
Fair Value, Inputs, Level 2 [Member] \| Fixed Income Securities, Other Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	73,975	66,177
Fair Value, Inputs, Level 2 [Member] \| Private Equity Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 2 [Member] \| Hedge Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 2 [Member] \| Real Estate [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	0	0
Investment in PVNGS lessor notes	32,836	57,279
Other investments	1,736	2,506
Fair value of plan assets at end of year	75,584	95,999
Fair Value, Inputs, Level 3 [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	0	0
Investment in PVNGS lessor notes	32,836	57,279
Other investments	0	0
Fair Value, Inputs, Level 3 [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	0	0
Other investments	0	0
Fair Value, Inputs, Level 3 [Member] \| PNMR Master Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	75,584	95,999
Fair Value, Inputs, Level 3 [Member] \| PNMR Master Trust [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	80,991	79,017
Actual return on assets sold during the period	10,376	3,303
Actual return on assets still held at period end	(5,731)	3,361
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	8,832	15,110
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(28,843)	(19,800)
Fair value of plan assets at end of year	65,625	80,991
Fair Value, Inputs, Level 3 [Member] \| PNMR Master Trust [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	15,008	14,171
Actual return on assets sold during the period	3,409	1,400
Actual return on assets still held at period end	(1,883)	1,425
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	2,902	6,408
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(9,477)	(8,396)
Fair value of plan assets at end of year	9,959	15,008
Fair Value, Inputs, Level 3 [Member] \| Cash and Cash Equivalents [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| Equity Securities, International Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Domestic Value [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Domestic Growth [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Other Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| Fixed Income Securities, Corporate [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	176	0
Actual return on assets sold during the period	0	1
Actual return on assets still held at period end	(20)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	608	175
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(37)	0
Fair value of plan assets at end of year	727	176
Fair Value, Inputs, Level 3 [Member] \| Fixed Income Securities, U.S. Government [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| Fixed Income Securities, Municipals [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| Fixed Income Securities, Other Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Fair Value, Inputs, Level 3 [Member] \| Private Equity Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	39,122	38,212
Actual return on assets sold during the period	5,355	4,677
Actual return on assets still held at period end	(296)	1,162
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	3,656	3,117
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(10,617)	(8,046)
Fair value of plan assets at end of year	37,220	39,122
Fair Value, Inputs, Level 3 [Member] \| Hedge Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	34,912	31,277
Actual return on assets sold during the period	8,667	135
Actual return on assets still held at period end	(7,536)	3,500
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	5,500	16,151
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(17,667)	(16,151)
Fair value of plan assets at end of year	23,876	34,912
Fair Value, Inputs, Level 3 [Member] \| Real Estate [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	21,789	23,699
Actual return on assets sold during the period	(236)	(109)
Actual return on assets still held at period end	237	123
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	1,971	2,076
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(10,000)	(4,000)
Fair value of plan assets at end of year	13,761	21,789
Fair Value, Inputs, Level 3 [Member] \| Private Equity, Hedge and Real Estate Funds [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	95,999	93,188
Actual return on assets sold during the period	13,786	4,704
Actual return on assets still held at period end	(7,615)	4,785
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	11,735	21,519
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(38,321)	(28,197)
Fair value of plan assets at end of year	75,584	95,999
Pension Plan [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year			518,095
Fair value of plan assets at end of year	587,909	556,353	518,095
Pension Plan [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year			66,540
Fair value of plan assets at end of year	69,177	66,118	66,540
Pension Plan [Member] \| PNMR Master Trust [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	588,112	557,258
Pension Plan [Member] \| PNMR Master Trust [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	69,207	66,285
Pension Plan [Member] \| Fair Value, Inputs, Level 1 [Member] \| PNMR Master Trust [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	123,668	145,364
Pension Plan [Member] \| Fair Value, Inputs, Level 1 [Member] \| PNMR Master Trust [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	14,823	18,657
Pension Plan [Member] \| Fair Value, Inputs, Level 2 [Member] \| PNMR Master Trust [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	398,819	330,903
Pension Plan [Member] \| Fair Value, Inputs, Level 2 [Member] \| PNMR Master Trust [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	44,425	32,620
Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| PNMR Master Trust [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	65,625	80,991
Pension Plan [Member] \| Fair Value, Inputs, Level 3 [Member] \| PNMR Master Trust [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	9,959	15,008
Other Postretirement Benefits [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period	79,018	74,133
Fair value of plan assets at beginning of year			64,464
Fair value of plan assets at end of year	78,175	73,565	64,464
Other Postretirement Benefits [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period	10,211	9,734
Fair value of plan assets at beginning of year			8,643
Fair value of plan assets at end of year	10,094	9,601	8,643
Other Postretirement Benefits [Member] \| Cash and Cash Equivalents [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,242	1,152
Other Postretirement Benefits [Member] \| Cash and Cash Equivalents [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	168	302
Other Postretirement Benefits [Member] \| Equity Securities, International Funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	10,332	11,634
Other Postretirement Benefits [Member] \| Equity Securities, International Funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,277	1,334
Other Postretirement Benefits [Member] \| Equity Securities, Domestic Value [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	8,365	6,388
Other Postretirement Benefits [Member] \| Equity Securities, Domestic Value [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	403	381
Other Postretirement Benefits [Member] \| Equity Securities, Domestic Growth [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	5,960	24,135
Other Postretirement Benefits [Member] \| Equity Securities, Domestic Growth [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,024	4,171
Other Postretirement Benefits [Member] \| Equity Securities, Other Funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	30,997	14,028
Other Postretirement Benefits [Member] \| Equity Securities, Other Funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	3,790	1,844
Other Postretirement Benefits [Member] \| Fixed income securities, Mutual funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	22,122	16,796
Other Postretirement Benefits [Member] \| Fixed income securities, Mutual funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	3,549	1,702
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period	37,689	31,430
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period	5,144	4,233
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Cash and Cash Equivalents [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,242	1,152
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Cash and Cash Equivalents [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	168	302
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities, International Funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities, International Funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Domestic Value [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	8,365	6,388
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Domestic Value [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	403	381
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Domestic Growth [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	5,960	7,094
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Domestic Growth [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,024	1,848
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Other Funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Other Funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fixed income securities, Mutual funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	22,122	16,796
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fixed income securities, Mutual funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	3,549	1,702
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period	41,329	42,703
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period	5,067	5,501
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Cash and Cash Equivalents [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Cash and Cash Equivalents [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities, International Funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	10,332	11,634
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities, International Funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	1,277	1,334
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Domestic Value [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Domestic Value [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Domestic Growth [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	17,041
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Domestic Growth [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	2,323
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Other Funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	30,997	14,028
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Other Funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	3,790	1,844
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fixed income securities, Mutual funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fixed income securities, Mutual funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Cash and Cash Equivalents [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Cash and Cash Equivalents [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities, International Funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities, International Funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Domestic Value [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Domestic Value [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Domestic Growth [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Domestic Growth [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Other Funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Other Funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fixed income securities, Mutual funds [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Other Postretirement Benefits [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fixed income securities, Mutual funds [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	0	0
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| PNMR [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	1,975,090	1,745,420
Investment in PVNGS lessor notes	31,232	52,958
Other investments	1,762	1,835
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Public Service Company of New Mexico [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	1,490,657	1,290,618
Investment in PVNGS lessor notes	31,232	52,958
Other investments	397	445
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	365,667	336,036
Other investments	$ 242	$ 245