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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract] |
Reconciliation of Asset Retirement Obligations | A reconciliation of the ARO liability is as follows:
| PNMR |  | PNM |  | TNMP
| (In thousands)
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 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | — |  |  | — |  |  | — |
Accretion expense | 7,984 |  |  | 7,906 |  |  | 66 |
Revisions to estimated cash flows | 51 |  |  | 51 |  |  | — |
Liability at December 31, 2014 | 104,170 |  |  | 103,182 |  |  | 848 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (730 | ) |  | (506 | ) |  | (224 | )
Accretion expense | 8,625 |  |  | 8,543 |  |  | 71 |
Revisions to estimated cash flows(2) | (170 | ) |  | (170 | ) |  | — |
Liability at December 31, 2015 | $ | 111,895 |  |  | $ | 111,049 |  |  | $ | 695 |
(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 2013, a new decommissioning study for PVNGS was implemented reflecting updated cash flow estimates, including the extended operating licenses. The new study resulted in an increase of $0.5 million to the ARO. In addition, a new decommissioning study for SJGS was implemented in 2013, resulting in a $2.5 million increase to the ARO.
(2) | Based on studies to estimate the amount and timing of future ARO expenditures. PNM has an ARO for Four Corners that includes obligations for decommissioning of that facility. In 2015, a new decommissioning study for Four Corners was implemented reflecting updated cash flow estimates. The new study resulted in an increase of $1.0 million to the ARO. In addition, a new decommissioning study for SJGS was implemented in 2015, resulting in a $1.2 million decrease 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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