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Fair Value of Derivative and Other Financial Instruments, Carrying Amount and Fair Value (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | $ 1,674,013 | $ 1,565,847
Investments in PVNGS lessor notes | 107,094 | 136,145
Other investments | 12,207 | 18,791
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 1,873,002 | 1,659,674
Investments in PVNGS lessor notes | 108,742 | 141,663
Other investments | 14,208 | 21,675
Public Service Company of New Mexico [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 1,215,540 | 1,055,748
Investments in PVNGS lessor notes | 107,094 | 136,145
Other investments | 2,900 | 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 | 1,294,846 | 1,056,864
Investments in PVNGS lessor notes | 108,742 | 141,663
Other investments | 3,052 | 5,563
Texas-New Mexico Power Company [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 310,963 | 310,337
Other investments | 271 | 282
Texas-New Mexico Power Company [Member] | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 413,966 | 385,220
Other investments | $ 271 | $ 282

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- Definition Investment In Lessor Notes, Fair Value Disclosure + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other Investments Fair Value Disclosure + References No definition available. + Details
Name: | pnm_OtherInvestmentsFairValueDisclosure
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant