Schedule of Change in Asset Retirement Obligation |
The following tables present the details of ARO which are included on the accompanying Consolidated Balance Sheets in Other deferred credits and other liabilities (in thousands): | | | | | | | | | | | | | | | | | | | | | December 31, 2014 | Liabilities Incurred | Liabilities Settled | Accretion | Revisions to Prior Estimates (a) | December 31, 2015 | Electric Utilities | $ | 7,012 |
| $ | — |
| $ | (2,733 | ) | $ | 183 |
| $ | — |
| $ | 4,462 |
| Gas Utilities | 291 |
| — |
| (168 | ) | 13 |
| — |
| 136 |
| Coal Mining | 19,138 |
| — |
| — |
| 993 |
| (1,498 | ) | 18,633 |
| Oil and Gas | 20,945 |
| 828 |
| (1,792 | ) | 1,371 |
| 152 |
| 21,504 |
| Total | $ | 47,386 |
| $ | 828 |
| $ | (4,693 | ) | $ | 2,560 |
| $ | (1,346 | ) | $ | 44,735 |
|
| | | | | | | | | | | | | | | | | | | | | December 31, 2013 | Liabilities Incurred | Liabilities Settled | Accretion | Revisions to Prior Estimates (a)(b) | December 31, 2014 | Electric Utilities | $ | 6,922 |
| $ | — |
| $ | (85 | ) | $ | 175 |
| $ | — |
| $ | 7,012 |
| Gas Utilities | 274 |
| — |
| — |
| 17 |
| — |
| 291 |
| Coal Mining | 20,627 |
| 345 |
| — |
| 951 |
| (2,785 | ) | 19,138 |
| Oil and Gas | 24,028 |
| 68 |
| (932 | ) | 1,043 |
| (3,262 | ) | 20,945 |
| Total | $ | 51,851 |
| $ | 413 |
| $ | (1,017 | ) | $ | 2,186 |
| $ | (6,047 | ) | $ | 47,386 |
|
_____________________ | | (a) | The Coal Mining Revision to Prior Estimates reflects the change in backfill yards and disturbed acreage used in calculating the estimated liability as well as changes in inflation rate assumptions. |
| | (b) | The Oil and Gas Revision to Prior Estimates was due to a change in useful well lives used in calculating the estimated liability. |
|