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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations [Table Text Block] | A reconciliation of the ARO liability is as follows:
| PNMR |  | PNM |  | TNMP
| (In thousands)
Liability at December 31, 2010 | $ | 76,637 |  |  | $ | 75,888 |  |  | $ | 648 |
Liabilities incurred | 60 |  |  | 60 |  |  | — |
Liabilities settled | (4 | ) |  | — |  |  | (4 | )
Accretion expense | 6,114 |  |  | 6,051 |  |  | 55 |
Revisions to estimated cash flows (1) | (3,574 | ) |  | (3,574 | ) |  | — |
Liability at December 31, 2011 | 79,233 |  |  | 78,425 |  |  | 699 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (25 | ) |  | — |  |  | (25 | )
Accretion expense | 6,685 |  |  | 6,617 |  |  | 58 |
Liability at December 31, 2012 | 85,893 |  |  | 85,042 |  |  | 732 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (79 | ) |  | (67 | ) |  | (12 | )
Accretion expense | 7,245 |  |  | 7,174 |  |  | 62 |
Revisions to estimated cash flows(1) | 3,076 |  |  | 3,076 |  |  | — |
Liability at December 31, 2013 | $ | 96,135 |  |  | $ | 95,225 |  |  | $ | 782 |
(1) | Based on studies to estimate the amount and timing of future ARO expenditures. PNM has an ARO for PVNGS that includes the obligations for nuclear decommissioning of that facility. In 2011 and 2013, new decommissioning studies for PVNGS were implemented reflecting updated cash flow estimates, including the extended operating licenses. The new studies resulted in a $4.2 million decrease to the ARO in 2011 and an increase of $0.5 million to the ARO in 2013. In addition, a new decommissioning study for SJGS was implemented in 2013, resulting in a $2.5 million increase to the ARO.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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