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Financing Schedule of Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Oct. 24, 2011 | Dec. 31, 2010 | Oct. 24, 2011 Unsecured Debt [Member] | Dec. 31, 2011 Unsecured Debt [Member] Senior unsecured notes, 9.25% due 2015 [Member] | Dec. 31, 2010 Unsecured Debt [Member] Senior unsecured notes, 9.25% due 2015 [Member] | Dec. 31, 2011 Other [Member] | Dec. 31, 2010 Other [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.875% due 2033 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.875% due 2033 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.15% due 2037 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.15% due 2037 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 6.25% due 2038 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 6.25% due 2038 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.75% due 2040, mandatory tender at June 1, 2017 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.75% due 2040, mandatory tender at June 1, 2017 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.20% due 2040, mandatory tender at June 1, 2020 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.20% due 2040, mandatory tender at June 1, 2020 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.90% due 2040 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.90% due 2040 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 6.25% due 2040 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 6.25% due 2040 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.00% due 2043, mandatory tender at June 1, 2015 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.00% due 2043, mandatory tender at June 1, 2015 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.20% due 2043, mandatory tender at June 1, 2020 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.20% due 2043, mandatory tender at June 1, 2020 [Member] | Oct. 06, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 7.95% due 2018 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 7.95% due 2018 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 7.50% due 2018 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 7.50% due 2018 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 5.35% due 2021 [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 5.35% due 2021 [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] Other [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] Other [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] | Jan. 02, 2009 Texas-New Mexico Power Company [Member] Unsecured Debt [Member] | Mar. 23, 2009 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] 2009 Term Loan Agreement, due 2014 [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] 2009 Term Loan Agreement, due 2014 [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] 2011 Term Loan Agreement, due 2014 [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] 2011 Term Loan Agreement, due 2014 [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] 9.50% due 2019, Series 2009A [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] 9.50% due 2019, Series 2009A [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] Other [Member] | Dec. 31, 2010 Texas-New Mexico Power Company [Member] Other [Member] | Dec. 31, 2011 PNMR [Member] | Dec. 31, 2010 PNMR [Member] | Dec. 31, 2011 PNMR [Member] Unsecured Debt [Member] Senior unsecured notes, 9.25% due 2015 [Member] | Dec. 31, 2010 PNMR [Member] Unsecured Debt [Member] Senior unsecured notes, 9.25% due 2015 [Member]
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 9.25% |  |  |  |  |  |  | 4.875% | 4.875% | 5.15% | 5.15% | 6.25% | 6.25% | 4.75% | 4.75% | 5.20% | 5.20% | 5.90% | 5.90% | 6.25% | 6.25% | 4.00% | 4.00% | 5.20% | 5.20% | 5.35% | 7.95% | 7.95% | 7.50% | 7.50% | 5.35% | 5.35% |  |  |  |  | 6.25% | 9.50% |  |  |  |  | 9.50% | 9.50% |  |  |  |  | 9.25% | 9.25%
Unsecured Long-term Debt, Noncurrent |  | $ 50,000 |  |  | $ 142,592 | $ 192,592 | $ 4,918 | $ 7,170 |  |  | $ 146,000 | $ 146,000 | $ 20,000 | $ 20,000 | $ 36,000 | $ 36,000 | $ 37,000 | $ 37,000 | $ 40,045 | $ 40,045 | $ 255,000 | $ 255,000 | $ 11,500 | $ 11,500 | $ 39,300 | $ 39,300 | $ 21,000 | $ 21,000 |  | $ 350,000 | $ 350,000 | $ 100,025 | $ 100,025 | $ 160,000 | $ 0 |  |  |  |  |  |  | $ 50,000 | $ 0 | $ 0 | $ 50,000 | $ 265,500 | $ 265,500 |  |  |  |  |  |
Other, including unamortized discounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (330) | (122) |  |  |  |  |  |  |  |  |  |  | (4,537) | (5,163) |  |  |  |
Long-term Debt | 1,674,013 |  | 1,565,847 |  |  |  |  |  | 1,215,540 | 1,055,748 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 310,963 | 310,337 |  |  |  |  |  |  |  |  |  |  | 147,510 | 199,762 |  |
Long-term Debt, Current Maturities | 2,387 |  | 2,252 |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  | 2,387 | 2,252 |  |
Long-term Debt, Excluding Current Maturities | $ 1,671,626 |  | $ 1,563,595 |  |  |  |  |  | $ 1,215,540 | $ 1,055,748 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 310,963 | $ 310,337 |  |  |  |  |  |  |  |  |  |  | $ 145,123 | $ 197,510 |  |

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + 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 210.5-02.22) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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