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Lease Commitments Narratives (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station, Unit 1 Leases [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Navajo Nation [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] Delta [Member] | Dec. 31, 2013 Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Texas-New Mexico Power Company [Member] | Dec. 31, 2011 Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Corporate Headquarters [Member] | Dec. 31, 2013 Administrative and General Expense [Member] | Dec. 31, 2013 Administrative and General Expense [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 Administrative and General Expense [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Approximate Annual Total for Operating Lease Payments [Member] | Dec. 31, 2013 Approximate Annual Total for Operating Lease Payments [Member] | Dec. 31, 2013 Approximate Annual Total for Operating Lease Payments [Member] | Dec. 31, 2013 TGP Granada, LLC and its affiliate Complaint [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2013 TGP Granada, LLC and its affiliate Complaint [Member] Tortoise Capital Resources Corporation [Member] | Jan. 15, 2016 Subsequent Event [Member] Public Service Company of New Mexico [Member] Palo Verde Nuclear Generating Station, Unit 2 Leases [Member] MW
Lease commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual lease payments |  |  |  |  |  | $ 33,000,000 | $ 23,700,000 | $ 6,000,000 | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Extended Term | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Renewal Options After Original Lease Term | 6 years | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental Payments, Fixed renewal option period during original terms of leases |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual Lease Payments During Renewal Period |  |  |  |  |  | 16,500,000 | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Purchase Price of Leased Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,100,000
Leased Capacity to be Purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Lease Covenant, Restriction on Conveying, Transferring, Leasing, & Dividends |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued |  |  |  |  | 154,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Lease ownership percentage in EIP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% | 40.00% |
Operating Lease, Notice Period to Purchase Leased Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24 months |  |
Public Utilities, Option to Purchase Leased Capacity At Fair Value |  | 7,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Rent Expense, Net |  | 78,306,000 | 78,483,000 | 78,422,000 |  |  |  |  |  | 2,663,000 | 2,871,000 | 3,606,000 | 1,900,000 |  |  |  |  |  |  |  |  |
Abandonment expense |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,400,000) | (6,200,000) | (1,200,000) |  |  |  |  |  |
Operating Leases Rent Expense Return on Lessor notes Rental Payments to be Received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 | $ 24,000,000 | $ 25,400,000 |  |  |

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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=31042434&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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