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Financing (Details) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |
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Nov. 22, 2011 | Nov. 04, 2011 | Oct. 05, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Oct. 24, 2011 | Sep. 23, 2011 | Dec. 31, 2013 Unsecured Debt [Member] | Oct. 24, 2011 Unsecured Debt [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Apr. 30, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Oct. 12, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Oct. 06, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Dec. 31, 2013 Texas-New Mexico Power Company [Member] | Mar. 06, 2013 Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Texas-New Mexico Power Company [Member] | Apr. 03, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Sep. 30, 2011 Notes Payable to Banks [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Notes Payable to Banks [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Notes Payable to Banks [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 New Mexico Public Regulation Commission [Member] Public Service Company of New Mexico [Member] Extensions | Dec. 31, 2013 Senior unsecured notes, 9.25% due 2015 [Member] | Dec. 31, 2013 Senior unsecured notes, 9.25% due 2015 [Member] Unsecured Debt [Member] | Dec. 31, 2012 Senior unsecured notes, 9.25% due 2015 [Member] Unsecured Debt [Member] | Dec. 31, 2013 PNMR Term Loan Agreement [Member] | Dec. 31, 2012 PNMR Term Loan Agreement [Member] | Dec. 31, 2013 PNMR Term Loan Agreement [Member] Notes Payable to Banks [Member] | Dec. 14, 2012 PNMR Term Loan Agreement [Member] Notes Payable to Banks [Member] | Dec. 31, 2013 2.54% Maturing of September First, 2042 with a Mandatory Tender on June First, 2017 [Member] Public Service Company of New Mexico [Member] Pollution Control Revenue Bonds [Member] | Dec. 31, 2013 5.15% Percent Maturing in 2037 [Member] Public Service Company of New Mexico [Member] Pollution Control Revenue Bonds [Member] | Dec. 31, 2013 PNM Term Loan Agreement [Member] Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Dec. 31, 2012 PNM Term Loan Agreement [Member] Public Service Company of New Mexico [Member] Unsecured Debt [Member] | Apr. 22, 2013 PNM Term Loan Agreement [Member] Notes Payable to Banks [Member] | Dec. 31, 2013 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Apr. 03, 2013 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Mar. 06, 2013 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Dec. 31, 2012 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Dec. 31, 2013 First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Apr. 03, 2013 First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Mar. 06, 2013 First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Dec. 31, 2012 First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] | Dec. 09, 2013 First Mortgage Bonds Due 2024, Series 2014A, at 4 point 03 percent [Member] [Member] Texas-New Mexico Power Company [Member] Pollution Control Revenue Bonds [Member] | Feb. 21, 2014 Subsequent Event [Member] | Feb. 21, 2014 Subsequent Event [Member] Public Service Company of New Mexico [Member] | Feb. 21, 2014 Subsequent Event [Member] Texas-New Mexico Power Company [Member] | Feb. 21, 2014 Subsequent Event [Member] New Mexico Revolving Credit Facility [Member] Public Service Company of New Mexico [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 291,400,000 | $ 327,400,000 | $ 74,700,000 | $ 25,000,000
Preferred Stock, Shares Outstanding |  |  |  |  |  |  |  | 477,800 |  |  | 115,293 | 115,293 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  |  |  |  |  |  | 4,778,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Purchase Discount |  |  |  |  |  |  |  | 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Convertible Preferred Stock |  |  | 73,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Outstanding |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Long-term Debt, Noncurrent |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118,766,000 | 142,592,000 |  |  |  |  |  |  | 75,000,000 | 0 |  | 172,302,000 |  |  | 265,500,000 | 93,198,000 |  |  | 0 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 9.25% | 9.25% |  |  |  |  |  | 5.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.54% | 5.15% |  |  |  | 9.50% | 9.50% | 9.50% | 9.50% | 6.95% | 6.95% | 6.95% | 6.95% | 4.03% |  |  |  |
Debt Instrument, Repurchase Premium |  |  |  |  |  |  | 0.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,000,000 |  | 1,000 |  |  |  |  |  |  | 23,800,000 |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  | 265,500,000 |  |  | 93,200,000 |  |  | 80,000,000 |  |  |  |
Repayments of Unsecured Debt | 58,500,000 |  |  | 26,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on reacquired debt |  |  |  | 3,253,000 | 0 | 9,209,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  | 7,019,550 |  | 79,653,624 | 79,653,624 |  |  |  |  |  | 39,117,799 | 39,117,799 |  |  |  |  | 6,358 |  | 6,358 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Repurchase Discount |  | 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Common Stock |  | 125,700,000 |  | 0 | 0 | 125,683,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | 149,200,000 | 158,700,000 |  |  |  |  |  | 49,200,000 | 21,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 100,000,000 |  | 100,000,000 |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Short-term Debt |  |  |  | 0 | 100,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Issuance, Face Amount Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.99857 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Requested Approval to Refinance Debt |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Number of Extension Options Received Authority To Exercise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Extension Option Granted Authority To Exercise, Years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Refunded Amount Redeemed at Par and Retired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Shelf Registration Statement for Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 440,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Bank Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Amount Secured by Collateral |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.475% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.985% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.566% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Cash Offered for Debt Exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 140 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Cash Paid for Debt Exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,200,000 |  |  |  |  |  |  |

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- Definition Minimum contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt premium 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 Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: 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 Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -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 19, 22 -Article 5 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow to reacquire preferred stock originally issued and identified as a security that can be exchanged for another type of financial security. This repurchased stock is held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash inflow from bank borrowing during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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