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Fair Value of Derivative and Other Financial Instruments, Recurring (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value Disclosure Derivative Reconciling Amount from Contract Value to Fair Value | $ 1,400 |  |  | $ 1,400 |  |  | $ 100 |
Fair Value, Level 1 to level 2 Transfers, Amount | 0 |  | 0 | 0 |  | 0 |  |
Fair Value, Level 2 to level 1 Transfers, Amount | 0 |  | 0 | 0 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability Transfers Into Level 3 | 0 |  | 0 | 0 |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Transfers out of Level 3 | 0 |  | 0 | 0 |  | 0 |  |
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Commodity derivative instruments, Assets | 3,963 | [1] |  | 3,963 | [1] |  | 1,443 | [1]
Commodity derivative instruments, Liabilities | (3,659) | [1] |  | (3,659) | [1] |  | (5,119) | [1]
Commodity derivative instruments, Net | 304 | [1] |  | 304 | [1] |  | (3,676) | [1]
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Commodity derivative instruments, Assets | 0 |  |  | 0 |  |  | 0 |
Commodity derivative instruments, Liabilities | 0 |  |  | 0 |  |  | 0 |
Commodity derivative instruments, Net | 0 |  |  | 0 |  |  | 0 |
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Commodity derivative instruments, Assets | 3,963 |  |  | 3,963 |  |  | 1,443 |
Commodity derivative instruments, Liabilities | (3,659) |  |  | (3,659) |  |  | (5,119) |
Commodity derivative instruments, Net | 304 |  |  | 304 |  |  | (3,676) |
Public Service Company of New Mexico [Member] | Commodity Contract [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Commodity derivative instruments, Assets | 0 |  |  | 0 |  |  | 0 |
Commodity derivative instruments, Liabilities | 0 |  |  | 0 |  |  | 0 |
Commodity derivative instruments, Net | 0 |  |  | 0 |  |  | 0 |
Commodity Contract [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Commodity derivative instruments, Assets | 41,232 | [1] |  | 41,232 | [1] |  | 21,263 | [1]
Commodity derivative instruments, Liabilities | (57,391) | [1] |  | (57,391) | [1] |  | (44,238) | [1]
Commodity derivative instruments, Net | (16,159) | [1] |  | (16,159) | [1] |  | (22,975) | [1]
Commodity Contract [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Commodity derivative instruments, Assets | 19,589 |  |  | 19,589 |  |  | 8,646 |
Commodity derivative instruments, Liabilities | (41,574) |  |  | (41,574) |  |  | (26,378) |
Commodity derivative instruments, Net | (21,985) |  |  | (21,985) |  |  | (17,732) |
Commodity Contract [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Commodity derivative instruments, Assets | 18,982 |  |  | 18,982 |  |  | 12,308 |
Commodity derivative instruments, Liabilities | (14,094) |  |  | (14,094) |  |  | (16,729) |
Commodity derivative instruments, Net | 4,888 |  |  | 4,888 |  |  | (4,421) |
Commodity Contract [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Commodity derivative instruments, Assets | 1,302 |  |  | 1,302 |  |  | 272 |
Commodity derivative instruments, Liabilities | (364) |  |  | (364) |  |  | (1,094) |
Commodity derivative instruments, Net | 938 |  |  | 938 |  |  | (822) |
Public Service Company of New Mexico [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value Disclosure Derivative Reconciling Amount from Contract Value to Fair Value | 0 |  |  | 0 |  |  | 0 |
Cash and equivalents [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 3,696 | [1] |  | 3,696 | [1] |  | 4,986 | [1]
Cash and equivalents [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 3,696 |  |  | 3,696 |  |  | 4,986 |
Cash and equivalents [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Cash and equivalents [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Domestic value [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 22,051 | [1] |  | 22,051 | [1] |  | 25,491 | [1]
Domestic value [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 22,051 |  |  | 22,051 |  |  | 25,491 |
Domestic value [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Domestic value [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Domestic growth [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 47,358 | [1] |  | 47,358 | [1] |  | 48,237 | [1]
Domestic growth [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 47,358 |  |  | 47,358 |  |  | 48,237 |
Domestic growth [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Domestic growth [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Multinational [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 12,509 | [1] |  | 12,509 | [1] |  | 10,670 | [1]
Multinational [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 12,509 |  |  | 12,509 |  |  | 10,670 |
Multinational [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Multinational [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
U.S. Government [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 22,779 | [1] |  | 22,779 | [1] |  | 21,541 | [1]
U.S. Government [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 18,149 |  |  | 18,149 |  |  | 16,613 |
U.S. Government [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 4,630 |  |  | 4,630 |  |  | 4,928 |
U.S. Government [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Municipals [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 39,316 | [1] |  | 39,316 | [1] |  | 37,595 | [1]
Municipals [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Municipals [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 39,316 |  |  | 39,316 |  |  | 37,595 |
Municipals [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Corporate and other [Member] | Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 9,292 | [1] |  | 9,292 | [1] |  | 8,402 | [1]
Corporate and other [Member] | Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Corporate and other [Member] | Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 9,292 |  |  | 9,292 |  |  | 8,402 |
Corporate and other [Member] | Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 0 |  |  | 0 |  |  | 0 |
Measured on a recurring basis [Member] | Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 157,001 | [1] |  | 157,001 | [1] |  | 156,922 | [1]
Measured on a recurring basis [Member] | Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 103,763 |  |  | 103,763 |  |  | 105,997 |
Measured on a recurring basis [Member] | Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | 53,238 |  |  | 53,238 |  |  | 50,925 |
Measured on a recurring basis [Member] | Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
NDT Investments | $ 0 |  |  | $ 0 |  |  | $ 0 |
[1] | The Level 1, 2 and 3 columns in the above table are presented based on the nature of each instrument. The total column is presented based on the balance sheet classification of the instruments and reflect unit of account reclassifications between commodity derivative assets and commodity derivative liabilities of $1.4 million for PNMR and zero for PNM at September 30, 2011 and less than $0.1 million for PNMR and zero for PNM at December 31, 2010. There were no transfers between levels for the three months and nine months ended September 30, 2011 and 2010.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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