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Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $) | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Assets, Current | $ 393,157,000 |  | $ 442,191,000
Commodity derivative instruments, Current assets | 2,870,000 |  | 3,785,000
Commodity derivative instruments, Deferred charges | 202,000 |  | 352,000
Commodity derivative instruments, Current liabilities |  | (1,621,000) | (1,000,000)
Commodity derivative instruments, Long-term liabilities |  | (1,540,000) | (1,933,000)
PNMR and PNM [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Margin Deposit Assets | 2,000,000 |  | 1,900,000
Public Service Company of New Mexico [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets, Current | 384,105,000 |  | 387,689,000
Commodity derivative instruments, Current assets | 2,870,000 |  | 3,785,000
Commodity derivative instruments, Deferred charges | 202,000 |  | 352,000
Commodity derivative instruments, Current liabilities |  | (1,621,000) | (1,000,000)
Commodity derivative instruments, Long-term liabilities |  | (1,540,000) | (1,933,000)
Commodity Contract [Member] | Fair Value Hedging [Member] | PNMR and PNM [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Commodity derivative instruments, Current assets | 2,870,000 |  | 3,785,000
Commodity derivative instruments, Deferred charges | 202,000 |  | 352,000
Commodity derivative instruments, Assets | 3,072,000 |  | 4,137,000
Commodity derivative instruments, Current liabilities | (1,621,000) |  | (1,000,000)
Commodity derivative instruments, Long-term liabilities | (1,540,000) |  | (1,933,000)
Commodity derivative instruments, Liabilities | (3,161,000) |  | (2,933,000)
Commodity derivative instruments, Net | (89,000) |  | 1,204,000
Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Fair Value Hedging [Member] | Public Service Company of New Mexico [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Assets, Current | $ 500,000 |  | $ 100,000
Firm Contract [Member] | Public Service Company of New Mexico [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Percentage of Electric Power Plant Output Sold through 2013 | 100.00% |  |
Percentage of Electric Power Plant Output Sold for 2014 and 2015 | 100.00% |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.9) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6801-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 9 -Article 5 + Details
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