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Fair Value of Derivative and Other Financial Instruments, Sale of Power (Details) (Public Service Company of New Mexico [Member], USD $) In Millions, unless otherwise specified | 9 Months Ended | 32 Months Ended
--- | --- | ---
Sep. 30, 2011 mw | Dec. 31, 2010 mw
Sale of Power [Line Items] |  |
Long Term Contract for Sale of Electric Power Plant Output | 135 | 135
Firm Contract [Member] |  |
Sale of Power [Line Items] |  |
Long Term Contract for Sale of Electric Power Plant Output |  | 90
Firm Contract 1 [Member] |  |
Sale of Power [Line Items] |  |
Prepayments |  | 40.6
Firm Contract 2 [Member] |  |
Sale of Power [Line Items] |  |
Prepayments |  | 30.0
Contingent Contract [Member] |  |
Sale of Power [Line Items] |  |
Long Term Contract for Sale of Electric Power Plant Output |  | 45

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Balance Type: | na
Period Type: | duration

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- Definition Sale of Power [Line Items] + Details
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Namespace Prefix: | pnm
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase (decrease) during the reporting period in the amount of prepayments by customers for goods or services to be provided at a later date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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