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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Electricity, transmission and distribution related services [Member] | TNMP to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 0 | $ 8,814
Service billings [Member] | TNMP to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 4 | 53
Service billings [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 22,055 | 21,437
Service billings [Member] | PNMR to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 6,951 | 6,581
Service billings [Member] | PNM to TNMP [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 121 | 122
Service billings [Member] | PNMR to Optim Energy [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 1,400
Service billings [Member] | Optim Energy to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 11
Income tax sharing payments [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 63,114 | 0
Income tax sharing payments [Member] | PNMR to TNMP |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 1,952 | 0
Interest charges [Member] | TNMP to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 18 | 2
Interest charges [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 45 | 32
Interest charges [Member] | PNM to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 0 | $ 28

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 2 -Subparagraph c -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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