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Pension and Other Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The fair values of investments held by the employee benefit plans are as follows:

	Total				Quoted Prices in Active Market for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
December 31, 2011					(In thousands)
PNM Pension Plan
Participation in PNMR Master Trust Total Plan Investments	$	444,466			$	176,279			$	184,054			$	84,133
TNMP Pension Plan
Participation in PNMR Master Trust Total Plan Investments	$	62,139			$	24,118			$	23,466			$	14,555
PNM OPEB Plan
Cash and equivalents	$	1,128			$	1,128			$	—			$	—
Equity securities:
International funds	2,740				—				2,740				—
Domestic value	1,289				1,289				—				—
Domestic growth	43,016				22,215				20,801				—
Other funds	7,678				—				7,678				—
Fixed income securities:
Mutual funds	4,006				4,006				—				—
Total Assets	$	59,857			$	28,638			$	31,219			$	—
TNMP OPEB Plan
Cash and equivalents	$	180			$	180			$	—			$	—
Equity securities:
International funds	1,248				—				1,248				—
Domestic value	551				551				—				—
Domestic growth	738				738				—				—
Other funds	3,048				—				3,048				—
Fixed income securities:
Mutual funds	2,694				2,694				—				—
Total Assets	$	8,459			$	4,163			$	4,296			$	—

	Total				Quoted Prices in Active Market for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
December 31, 2010	(In thousands)
PNM Pension Plan
Participation in PNMR Master Trust	$	393,480			$	208,759			$	105,781			$	78,940
TNMP Pension Plan
Participation in PNMR Master Trust	$	60,506			$	30,530			$	16,317			$	13,659
PNM OPEB Plan
Cash and equivalents	$	1,811			$	1,811			$	—			$	—
Equity securities:
International funds	3,182				—				3,182				—
Domestic value	1,363				1,363				—				—
Domestic growth	41,278				22,939				18,339				—
Other funds	9,057				—				9,057				—
Fixed income securities:
Mutual funds	5,860				5,860				—				—
Total Assets	$	62,551			$	31,973			$	30,578			$	—
TNMP OPEB Plan
Cash and equivalents	$	424			$	424			$	—			$	—
Equity securities:
International funds	1,116				—				1,116				—
Domestic value	582				582				—				—
Domestic growth	710				710				—				—
Other funds	2,959				—				2,959				—
Fixed income securities:
Mutual funds	2,834				2,834				—				—
Total Assets	$	8,625			$	4,550			$	4,075			$	—

The fair values of investments in the PNMR Master Trust are as follows:

	Total				Quoted Prices in Active Market for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
December 31, 2011	(In thousands)
PNMR Master Trust
Cash and equivalents	$	6,753			$	6,753			$	—			$	—
Equity securities:
International	37,173				37,173				—				—
Domestic value	58,350				57,437				913				—
Domestic growth	65,004				65,004				—				—
Other funds	15,271				—				15,271				—
Fixed income securities:
Corporate	59,730				—				59,730				—
U.S. government	104,102				34,030				70,072				—
Municipals	3,478				—				3,478				—
Other funds	58,056				—				58,056				—
Alternative investments:
Private equity funds	37,100				—				—				37,100
Hedge funds	36,904				—				—				36,904
Real estate funds	24,684				—				—				24,684
Total Fair Value of Plan Investments	$	506,605			$	200,397			$	207,520			$	98,688
December 31, 2010
PNMR Master Trust
Cash and equivalents	$	10,718			$	10,718			$	—			$	—
Equity securities:
International	46,505				46,505				—				—
Domestic value	79,218				76,493				2,725				—
Domestic growth	81,375				81,375				—				—
Other funds	49,307				—				49,307				—
Fixed income securities:
Corporate	2,062				—				2,062				—
U.S. government	39,585				24,198				15,387				—
Municipals	2,935				—				2,935				—
Other funds	49,682				—				49,682				—
Alternative investments:
Private equity funds	32,935				—				—				32,935
Hedge funds	37,622				—				—				37,622
Real estate funds	22,042				—				—				22,042
Total Assets	$	453,986			$	239,289			$	122,098			$	92,599

A reconciliation of the changes in Level 3 fair value measurements is as follows:

	Year Ended December 31,
Level 3 Fair Value Assets and Liabilities	2011				2010
	(In thousands)
PNM Pension	Master Trust				Master Trust				Real Estate Funds
Balance at beginning of period	$	78,940			$	74,105			$	2,168
Actual return on assets sold during the period	1,624				(778		)		(1,846		)
Actual return on assets still held at period end	1,404				4,015				—
Purchases	4,030				33,731				—
Sales	(1,865		)		(32,133		)		(322		)
Balance at end of period	$	84,133			$	78,940			$	—
TNMP Pension
Balance at beginning of period	$	13,659			$	12,426
Actual return on assets sold during the period	280				(199		)
Actual return on assets still held at period end	243				1,024
Purchases	695				8,602
Sales	(322		)		(8,194		)
Balance at end of period	$	14,555			$	13,659

Additional information concerning changes in Level 3 fair value measurements for the PNMR Master Trust is as follows:

Level 3 Fair Value Assets and Liabilities

PNMR Master Trust	Private equity funds				Hedge funds				Real estate funds				Total
					(In thousands)
Balance at December 31, 2009	$	26,883			$	34,921			$	24,727			$	86,531
Actual return on assets sold during the period	(769		)		—				(208		)		(977		)
Actual return on assets still held at period end	2,363				2,701				(25		)		5,039
Purchases	39,255				—				3,078				42,333
Sales	(34,797		)		—				(5,530		)		(40,327		)
Balance at December 31, 2010	32,935				37,622				22,042				92,599
Actual return on assets sold during the period	1,904				—				—				1,904
Actual return on assets still held at period end	2,372				(718		)		(7		)		1,647
Purchases	2,076				—				2,649				4,725
Sales	(2,187		)		—				—				(2,187		)
Balance at December 31, 2011	$	37,100			$	36,904			$	24,684			$	98,688

Schedule of Defined Contribution Plan Expenses [Table Text Block]

A summary of expenses for these other retirement plans is as follows:

	Year Ended December 31,
	2011				2010				2009
	(In thousands)
PNMR
401(k) plan	$	17,000			$	17,199			$	16,743
Non-qualified plan	$	1,931			$	2,500			$	2,073
PNM
401(k) plan	$	12,541			$	12,788			$	11,698
Non-qualified plan	$	1,407			$	1,871			$	1,299
TNMP
401(k) plan	$	3,723			$	3,496			$	3,323
Non-qualified plan	$	431			$	478			$	405

Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The following table presents information about the PBO, fair value of plan assets, and funded status of the plans:

	PNM Plan								TNMP Plan
	Year Ended December 31,								Year Ended December 31,
	2011				2010				2011				2010
	(In thousands)
PBO at beginning of year	$	593,457			$	545,747			$	72,260			$	68,636
Service cost	—				—				—				—
Interest cost	32,804				34,073				3,800				4,126
Actuarial (gain) loss	1,197				51,379				(2,793		)		5,113
Benefits paid	(38,584		)		(37,742		)		(6,033		)		(5,615		)
PBO at end of year	588,874				593,457				67,234				72,260
Fair value of plan assets at beginning of year	392,788				360,854				60,387				57,744
Actual return on plan assets	31,671				51,725				4,447				8,013
Employer contributions	41,511				17,951				1,151				245
Benefits paid	(38,584		)		(37,742		)		(6,033		)		(5,615		)
Fair value of plan assets at end of year	427,386				392,788				59,952				60,387
Funded status-asset (liability) for pension benefits	$	(161,488	)		$	(200,669	)		$	(7,282	)		$	(11,873	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The following table presents pre-tax information about prior service cost and net actuarial (gain) loss in AOCI as of December 31, 2011.

	PNM Plan								TNMP Plan
	December 31, 2011								December 31, 2011
	Prior service cost				Net actuarial (gain) loss				Net actuarial (gain) loss
	(In thousands)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	$	314			$	133,153			$	521
Experience loss (gain)	—				6,601				(1,863		)
Regulatory asset (liability) adjustment	(3		)		(1,592		)		1,358
Amortization recognized in net periodic benefit cost (income)	(140		)		(4,074		)		(16		)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	$	171			$	134,088			$	—
Amortization expected to be recognized in 2012	$	(138	)		$	(4,573	)		$	—

Schedule of Net Benefit Costs [Table Text Block]

The following table presents the components of net periodic benefit cost (income) recognized in the Consolidated Statements of Earnings (Loss):

	Year Ended December 31,
	2011				2010				2009
	(In thousands)
PNM Plan
Service cost	$	—			$	—			$	—
Interest cost	32,804				34,073				34,439
Expected return on plan assets	(37,075		)		(37,354		)		(38,763		)
Amortization of net (gain) loss	9,209				6,450				3,818
Amortization of prior service cost	317				317				317
Net periodic benefit cost (income)	$	5,255			$	3,486			$	(189	)
TNMP Plan
Service cost	$	—			$	—			$	—
Interest cost	3,800				4,126				4,396
Expected return on plan assets	(5,470		)		(5,794		)		(6,093		)
Amortization of net (gain) loss	346				—				—
Amortization of prior service cost	—				—				—
Net periodic benefit cost (income)	$	(1,324	)		$	(1,668	)		$	(1,697	)

Schedule of Assumptions Used [Table Text Block]

The following significant weighted-average assumptions were used to determine the PBO and net periodic benefit cost (income). Should actual experience differ from actuarial assumptions, the PBO and net periodic benefit cost (income) would be affected.

	Year Ended December 31,
PNM Plan	2011			2010			2009
Discount rate for determining December 31 PBO	5.67	%		5.72	%		6.47	%
Discount rate for determining net periodic benefit cost (income)	5.72	%		6.47	%		7.25	%
Expected return on plan assets	8.50	%		8.75	%		8.75	%
Rate of compensation increase	N/A			N/A			N/A
TNMP Plan
Discount rate for determining December 31 PBO	5.69	%		5.50	%		6.31	%
Discount rate for determining net periodic benefit cost (income)	5.50	%		6.31	%		7.25	%
Expected return on plan assets	8.50	%		8.75	%		8.75	%
Rate of compensation increase	N/A			N/A			N/A

Schedule of Expected Benefit Payments [Table Text Block]

The following pension benefit payments are expected to be paid:

	PNM Plan				TNMP Plan
	(In thousands)
2012	$	40,809			$	6,690
2013	41,759				5,806
2014	42,536				6,236
2015	43,183				6,046
2016	43,715				5,690
Years 2017 – 2021	222,072				25,715

Other Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The following table presents information about the APBO, the fair value of plan assets, and the funded status of the plans:

	PNM Plan								TNMP Plan
	Year Ended December 31,								Year Ended December 31,
	2011				2010				2011				2010
	(In thousands)
APBO at beginning of year	$	99,486			$	122,417			$	12,152			$	11,554
Service cost	259				419				306				289
Interest cost	5,378				7,650				654				711
Participant contributions	2,206				1,732				281				257
Actuarial (gain) loss	712				(17,952		)		(862		)		(116		)
Benefits paid	(10,315		)		(9,331		)		(1,187		)		(543		)
Plan amendments	(1,505		)		(5,449		)		—				—
APBO at end of year	96,221				99,486				11,344				12,152
Fair value of plan assets at beginning of year	61,749				57,126				8,596				7,093
Actual return on plan assets	2,263				9,771				262				1,214
Employer contributions	2,873				2,451				351				575
Participant contributions	2,206				1,732				281				257
Benefits paid	(10,315		)		(9,331		)		(1,187		)		(543		)
Fair value of plan assets at end of year	58,776				61,749				8,303				8,596
Funded status-asset (liability)	$	(37,445	)		$	(37,737	)		$	(3,041	)		$	(3,556	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The following table presents pre-tax information about prior service cost and net actuarial (gain) loss in AOCI as of December 31, 2011.

	PNM Plan								TNMP Plan
	December 31, 2011								December 31, 2011
	Prior service cost (credit)				Net actuarial (gain) loss				Prior service cost				Net actuarial (gain) loss
	(In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year	$	(882	)		$	3,187			$	12			$	(110	)
Experience loss (gain)	(1,505		)		3,837				—				(431		)
Regulatory asset (liability) adjustment	2,164				(5,940		)		(11		)		537
Amortization recognized in net periodic benefit cost (income)	102				(124		)		(1		)		4
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year	$	(121	)		$	960			$	—			$	—
Amortization expected to be recognized in 2012	$	35			$	(100	)		$	—			$	—

Schedule of Net Benefit Costs [Table Text Block]

The following table presents the components of net periodic benefit cost recognized in the Consolidated Statements of Earnings (Loss):

	Year Ended December 31,
	2011				2010				2009
	(In thousands)
PNM Plan
Service cost	$	259			$	419			$	417
Interest cost	5,378				7,650				7,388
Expected return on plan assets	(5,388		)		(5,572		)		(5,832		)
Amortization of net (gain) loss	3,205				5,489				3,290
Amortization of prior service credit	(2,648		)		(4,143		)		(4,262		)
Net periodic benefit cost	$	806			$	3,843			$	1,001
TNMP Plan
Service cost	$	306			$	289			$	260
Interest cost	654				711				733
Expected return on plan assets	(533		)		(514		)		(495		)
Amortization of net (gain) loss	(193		)		(195		)		(265		)
Amortization of prior service cost	60				60				60
Net periodic benefit cost	$	294			$	351			$	293

Schedule of Assumptions Used [Table Text Block]

The following significant weighted-average assumptions were used to determine the APBO and net periodic benefit cost. Should actual experience differ from actuarial assumptions, the APBO and net periodic benefit cost would be affected.

	Year Ended December 31,
PNM Plan	2011			2010			2009
Discount rate for determining December 31 APBO	5.70	%		5.59	%		6.42	%
Discount rate for determining net periodic benefit cost	5.59	%		6.42	%		7.25	%
Expected return on plan assets	8.50	%		8.75	%		8.75	%
Rate of compensation increase	N/A			N/A			N/A
TNMP Plan
Discount rate for determining December 31 APBO	5.70	%		5.59	%		6.42	%
Discount rate for determining net periodic benefit cost	5.59	%		6.42	%		7.25	%
Expected return on plan assets	6.30	%		6.70	%		6.70	%
Rate of compensation increase	N/A			N/A			N/A

Schedule of Expected Benefit Payments [Table Text Block]

The following other postretirement benefit payments, which reflect expected future service, are expected to be paid:

	PNM Plan				TNMP Plan
	(In thousands)
2012	$	6,708			$	777
2013	6,874				780
2014	7,138				797
2015	7,270				799
2016	7,520				816
Years 2017 – 2021	38,933				4,157

Schedule of Health Care Cost Trend Rates [Table Text Block]

The following table shows the assumed health care cost trend rates:

	PNM Plan
	December 31,
	2011			2010
Health care cost trend rate assumed for next year	7.5	%		8.0	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.0	%		5.0	%
Year that the rate reaches the ultimate trend rate	2017			2017

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

The following table shows the impact of a one-percentage-point change in assumed health care cost trend rates:

	PNM Plan
	1-Percentage- Point  Increase				1-Percentage- Point  Decrease
	(In thousands)
Effect on total of service and interest cost	$	424			$	(365	)
Effect on APBO	$	6,215			$	(5,417	)

Executive Retirement Program [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The following table presents pre-tax information about net actuarial loss in AOCI as of December 31, 2011.

	December 31, 2011
	PNM Plan				TNMP Plan
	(In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost at beginning of year	$	1,588			$	—
Experience loss (gain)	(252		)		8
Regulatory asset (liability) adjustment	59				(8		)
Amortization recognized in net periodic benefit cost (income)	(41		)		—
Amount in AOCI not yet recognized in net periodic benefit cost at end of year	$	1,354			$	—
Amortization expected to be recognized in 2012	$	(36	)		$	—

Schedule of Net Benefit Costs [Table Text Block]

The following table presents the components of net periodic benefit cost recognized in the Consolidated Statements of Earnings (Loss):

	Year Ended December 31,
	2011				2010				2009
	(In thousands)
PNM Plan
Service cost	$	—			$	—			$	59
Interest cost	930				1,053				1,135
Amortization of net loss	93				71				27
Amortization of prior service cost	—				—				10
Net periodic benefit cost	$	1,023			$	1,124			$	1,231
TNMP Plan
Service cost	$	—			$	—			$	—
Interest cost	46				52				76
Amortization of net (gain) loss	—				(4		)		—
Amortization of prior service cost	—				—				—
Net periodic benefit cost	$	46			$	48			$	76

Schedule of Assumptions Used [Table Text Block]

The following significant weighted-average assumptions were used to determine the PBO and net periodic benefit cost. Should actual experience differ from actuarial assumptions, the PBO and net periodic benefit cost would be affected.

	Year Ended December 31,
PNM Plan	2011			2010			2009
Discount rate for determining December 31 PBO	5.67	%		5.72	%		6.47	%
Discount rate for determining net periodic benefit cost	5.72	%		6.47	%		7.25	%
Long-term rate of return on plan assets	N/A			N/A			N/A
Rate of compensation increase	N/A			N/A			N/A
TNMP Plan
Discount rate for determining December 31 PBO	5.69	%		5.50	%		6.31	%
Discount rate for determining net periodic benefit cost	5.50	%		6.31	%		7.25	%
Long-term rate of return on plan assets	N/A			N/A			N/A
Rate of compensation increase	N/A			N/A			N/A

Schedule of Expected Benefit Payments [Table Text Block]

The following executive retirement plan payments, which reflect expected future service, are expected:

	PNM Plan				TNMP Plan
	(In thousands)
2012	$	1,477			$	91
2013	1,460				90
2014	1,441				89
2015	1,418				87
2016	1,393				85
Years 2017 – 2021	6,462				375

Schedule of Net Funded Status [Table Text Block]

For the executive retirement programs, the following table presents information about the PBO and funded status of the plans:

	PNM Plan								TNMP Plan
	Year Ended December 31,								Year Ended December 31,
	2011				2010				2011				2010
	(In thousands)
PBO at beginning of year	$	17,020			$	17,004			$	884			$	867
Service cost	—				—				—				—
Interest cost	930				1,054				46				52
Actuarial (gain) loss	(252		)		473				8				59
Benefits paid	(1,507		)		(1,511		)		(94		)		(94		)
PBO at end of year-funded status	16,191				17,020				844				884
Less current liability	1,436				1,478				89				89
Non-current liability	$	14,755			$	15,542			$	755			$	795

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Schedule of Defined Contribution Plan Expenses [Table Text Block]

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- Definition

Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost over the next fiscal year, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic 715

-SubTopic 20

-Publisher FASB

-Subparagraph (s)

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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- Definition

Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic 715

-SubTopic 20

-Publisher FASB

-Number

-Article

-Subparagraph (k)

-Name Accounting Standards Codification

-Paragraph 1

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