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Lease Commitments Narratives (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Lease commitments |  |  |
Operating Lease, Extended Term | 2 years |  |
Operating Leases, Renewal Options After Original Lease Term | 6 years |  |
Public Service Company of New Mexico [Member] |  |  |
Lease commitments |  |  |
Cash received back from lessor | $ 55,400,000 | $ 55,600,000 | $ 56,300,000
Operating Leases, Renewal Options After Original Lease Term | 2 |  |
Operating Leases, Rent Expense, Net | 78,483,000 | 78,422,000 | 71,209,000
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station [Member] |  |  |
Lease commitments |  |  |
Operating Lease, Extended Term, Notice Period to Retain Leased Assets | 3 years |  |
Operating Lease, Extended Term, Notice Period to Purchase or Renewal Options | 2 years |  |
Rental Payments, Fixed renewal option period during original terms of leases | 50.00% |  |
Lease Covenant, Restriction on Conveying, Transferring, Leasing, & Dividends | 5.00% |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | 167,600,000 |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member] |  |  |
Lease commitments |  |  |
Annual lease payments | 33,000,000 |  |
Annual Lease Payments During Renewal Period | 16,500,000 |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] |  |  |
Lease commitments |  |  |
Annual lease payments | 23,700,000 |  |
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station and EIP [Member] |  |  |
Lease commitments |  |  |
Sale Leaseback Transaction, Annual Rental Payments | 69,100,000 |  |
Public Service Company of New Mexico [Member] | Navajo Nation [Member] |  |  |
Lease commitments |  |  |
Annual lease payments | 6,000,000 |  |
Public Service Company of New Mexico [Member] | Delta [Member] |  |  |
Lease commitments |  |  |
Annual lease payments | 6,000,000 |  |
Texas-New Mexico Power Company [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Rent Expense, Net | 2,871,000 | 3,606,000 | 3,737,000
Corporate Headquarters [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Rent Expense, Net | 1,900,000 |  |
Approximate Annual Total for Operating Lease Payments [Member] |  |  |
Lease commitments |  |  |
Operating Leases Rent Expense Return on Lessor notes Rental Payments to be Received | 39,000,000 |  |
Approximate Annual Total for Operating Lease Payments [Member] |  |  |
Lease commitments |  |  |
Operating Leases Rent Expense Return on Lessor notes Rental Payments to be Received | 33,000,000 |  |
Administrative and General Expense [Member] |  |  |
Lease commitments |  |  |
Abandonment expense | (7,400,000) |  |
Administrative and General Expense [Member] | Public Service Company of New Mexico [Member] |  |  |
Lease commitments |  |  |
Abandonment expense | (6,200,000) |  |
Administrative and General Expense [Member] | Texas-New Mexico Power Company [Member] |  |  |
Lease commitments |  |  |
Abandonment expense | $ (1,200,000) |  |
Minimum [Member] | Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Renewal Options After Original Lease Term | 2 years |  |
Maximum [Member] | Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 1 Leases [Member] |  |  |
Lease commitments |  |  |
Operating Leases, Renewal Options After Original Lease Term | 8 years |  |

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition The yearly payments due under the lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 98 -Paragraph 17 -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 FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -Subparagraph d -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6456341&loc=d3e50796-112755 + Details
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