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Fair Value of Derivative and Other Financial Instruments, Carrying Amount and Fair Value (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Public Service Company of New Mexico [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 1,055,760	$ 1,055,748
Investments in PVNGS lessor notes	107,435	136,145
Other investments	4,193	5,068
Public Service Company of New Mexico [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,107,490	1,056,864
Investments in PVNGS lessor notes	108,345	141,663
Other investments	4,522	5,563
Texas-New Mexico Power Company [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	310,807	310,337
Other investments	267	282
Texas-New Mexico Power Company [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	423,253	385,220
Other investments	267	282
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,566,329	1,565,847
Investments in PVNGS lessor notes	107,435	136,145
Other investments	14,639	18,791
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,751,691	1,659,674
Investments in PVNGS lessor notes	108,345	141,663
Other investments	$ 21,070	$ 21,675

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- Definition

Investment In Lessor Notes, Fair Value Disclosure

+ Details

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Balance Type:	debit
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- Definition

Other Investments Fair Value Disclosure

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Balance Type:	na
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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant