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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 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(1) | (170 | ) |  | (170 | ) |  | — |
Liability at December 31, 2015 | 111,895 |  |  | 111,049 |  |  | 695 |
Liabilities incurred | — |  |  | — |  |  | — |
Liabilities settled | (14 | ) |  | (14 | ) |  | — |
Accretion expense | 9,170 |  |  | 9,098 |  |  | 59 |
Revisions to estimated cash flows(2) | 6,468 |  |  | 6,468 |  |  | — |
Liability at December 31, 2016 | $ | 127,519 |  |  | $ | 126,601 |  |  | $ | 754 |
(1) PNM has an ARO for Four Corners that includes the 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.
(2) | PNM has an ARO for PVNGS that includes obligations for nuclear decommissioning of that facility. In 2016, a new decommissioning study for PVNGS was implemented reflecting updated cash flow estimates. The new study resulted in an increase of $6.1 million to the ARO. In addition, an adjustment for SJGS related to the 2015 decommissioning study was implemented in 2016, resulting in a $0.3 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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