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Pension and Other Postretirement Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Public Service Company of New Mexico [Member] | Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	8,202,000	8,518,000	24,606,000	25,555,000
Long-term return on plan assets	(9,269,000)	(9,339,000)	(27,807,000)	(28,016,000)
Amortization of net loss	2,302,000	1,613,000	6,906,000	4,838,000
Amortization of prior service cost	79,000	79,000	237,000	238,000
Net periodic benefit cost	1,314,000	871,000	3,942,000	2,615,000
Defined Benefit Plan, Contributions by Employer	20,500,000	6,500,000	34,000,000	13,100,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	7,500,000		7,500,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year	163,900,000		163,900,000
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	65,000	105,000	195,000	314,000
Interest cost	1,345,000	1,913,000	4,035,000	5,738,000
Long-term return on plan assets	(1,347,000)	(1,393,000)	(4,041,000)	(4,179,000)
Amortization of net loss	801,000	1,372,000	2,403,000	4,116,000
Amortization of prior service cost	(662,000)	(1,036,000)	(1,986,000)	(3,107,000)
Net periodic benefit cost	202,000	961,000	606,000	2,882,000
Defined Benefit Plan, Contributions by Employer	700,000	400,000	1,900,000	1,600,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year	2,600,000		2,600,000
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0	0	0
Interest cost	233,000	263,000	699,000	790,000
Long-term return on plan assets	0	0	0	0
Amortization of net loss	23,000	18,000	69,000	53,000
Amortization of prior service cost	0	0	0	0
Net periodic benefit cost	256,000	281,000	768,000	843,000
Defined Benefit Plan, Contributions by Employer	400,000	400,000	1,200,000	1,100,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year	1,500,000		1,500,000
Texas-New Mexico Power Company [Member] | Maximum [Member] | Executive Retirement Program [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Contributions by Employer	100,000	100,000	100,000	100,000
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0	0	0
Interest cost	951,000	1,032,000	2,853,000	3,095,000
Long-term return on plan assets	(1,368,000)	(1,449,000)	(4,104,000)	(4,346,000)
Amortization of net loss	86,000	0	258,000	0
Amortization of prior service cost	0	0	0	0
Net periodic benefit cost	(331,000)	(417,000)	(993,000)	(1,251,000)
Defined Benefit Plan, Contributions by Employer	800,000	200,000	1,000,000	200,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	200,000		200,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year	6,000,000		6,000,000
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	77,000	72,000	231,000	217,000
Interest cost	163,000	178,000	489,000	533,000
Long-term return on plan assets	(133,000)	(129,000)	(399,000)	(386,000)
Amortization of net loss	(48,000)	(49,000)	(144,000)	(147,000)
Amortization of prior service cost	15,000	15,000	45,000	45,000
Net periodic benefit cost	74,000	87,000	222,000	262,000
Defined Benefit Plan, Contributions by Employer	0	0	400,000	600,000
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0	0	0
Interest cost	12,000	13,000	36,000	39,000
Long-term return on plan assets	0	0	0	0
Amortization of net loss	0	(1,000)	0	(3,000)
Amortization of prior service cost	0	0	0	0
Net periodic benefit cost	12,000	12,000	36,000	36,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year	$ 100,000		$ 100,000

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Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year

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The amount of gains or losses recognized in net periodic benefit cost.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The increase in the fair value of plan assets from contributions made by the employer.

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-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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