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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations AROs are recorded based on the determination of underlying assumptions, such as discount rates, estimates of the future costs for decommissioning, and the timing of the removal activities to be performed. Any changes in these assumptions underlying the required calculations may require revisions to the estimated AROs when identified. 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 The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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