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Schedule I - Condensed Financial Information of Parent Company (Parenthetical) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Condensed Financial Statements, Captions [Line Items] |  |
Common stock, par value | $ 0us-gaap_CommonStockNoParValue | $ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized | 120,000,000us-gaap_CommonStockSharesAuthorized | 120,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued | 79,653,624us-gaap_CommonStockSharesIssued | 79,653,624us-gaap_CommonStockSharesIssued
Common stock, shares outstanding | 79,653,624us-gaap_CommonStockSharesOutstanding | 79,653,624us-gaap_CommonStockSharesOutstanding
PNM Resources [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Accumulated Depreciation | $ 10,251us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 9,167us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, par value | $ 0us-gaap_CommonStockNoParValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 0us-gaap_CommonStockNoParValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, shares authorized | 120,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 120,000,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, shares issued | 79,653,624us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 79,653,624us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Common stock, shares outstanding | 79,653,624us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 79,653,624us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Face amount per share of no-par value common stock. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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