The changes in the carrying amounts of AROs were as follows.
| | | | | PPL | | PPL Energy Supply |
| | | | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 552 | | $ | 497 | | $ | 375 | | $ | 359 |
| | Accretion expense | | | 38 | | | 36 | | | 29 | | | 28 |
| | Obligations incurred | | | 6 | | | 9 | | | 6 | | | 3 |
| | Changes in estimated cash flow or settlement date | | | 123 | | | 31 | | | 1 | | | (7) |
| | Effect of foreign currency exchange rates | | | 1 | | | 1 | | | | | | |
| | Obligations settled | | | (15) | | | (22) | | | (7) | | | (8) |
| ARO at end of period | | $ | 705 | | $ | 552 | | $ | 404 | | $ | 375 |
| | | | | LKE | | LG&E | | KU |
| | | | | 2013 | | 2012 | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 131 | | $ | 118 | | $ | 62 | | $ | 57 | | $ | 69 | | $ | 61 |
| | Accretion expense | | | 7 | | | 6 | | | 3 | | | 3 | | | 4 | | | 3 |
| | Obligations incurred | | | | | | 6 | | | | | | | | | | | | 6 |
| | Changes in estimated cash flow | | | | | | | | | | | | | | | | | | |
| | | or settlement date | | | 122 | | | 15 | | | 17 | | | 5 | | | 105 | | | 10 |
| | Obligations settled | | | (8) | | | (14) | | | (8) | | | (3) | | | | | | (11) |
| ARO at end of period | | $ | 252 | | $ | 131 | | $ | 74 | | $ | 62 | | $ | 178 | | $ | 69 |
us-gaap:ScheduleOfChangeInAssetRetirementObligationTableTextBlock
The changes in the carrying amounts of AROs were as follows.
| | | | | PPL | | PPL Energy Supply |
| | | | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 552 | | $ | 497 | | $ | 375 | | $ | 359 |
| | Accretion expense | | | 38 | | | 36 | | | 29 | | | 28 |
| | Obligations incurred | | | 6 | | | 9 | | | 6 | | | 3 |
| | Changes in estimated cash flow or settlement date | | | 123 | | | 31 | | | 1 | | | (7) |
| | Effect of foreign currency exchange rates | | | 1 | | | 1 | | | | | | |
| | Obligations settled | | | (15) | | | (22) | | | (7) | | | (8) |
| ARO at end of period | | $ | 705 | | $ | 552 | | $ | 404 | | $ | 375 |
| | | | | LKE | | LG&E | | KU |
| | | | | 2013 | | 2012 | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 131 | | $ | 118 | | $ | 62 | | $ | 57 | | $ | 69 | | $ | 61 |
| | Accretion expense | | | 7 | | | 6 | | | 3 | | | 3 | | | 4 | | | 3 |
| | Obligations incurred | | | | | | 6 | | | | | | | | | | | | 6 |
| | Changes in estimated cash flow | | | | | | | | | | | | | | | | | | |
| | | or settlement date | | | 122 | | | 15 | | | 17 | | | 5 | | | 105 | | | 10 |
| | Obligations settled | | | (8) | | | (14) | | | (8) | | | (3) | | | | | | (11) |
| ARO at end of period | | $ | 252 | | $ | 131 | | $ | 74 | | $ | 62 | | $ | 178 | | $ | 69 |
us-gaap:ScheduleOfChangeInAssetRetirementObligationTableTextBlock
The changes in the carrying amounts of AROs were as follows.
| | | | | PPL | | PPL Energy Supply |
| | | | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 552 | | $ | 497 | | $ | 375 | | $ | 359 |
| | Accretion expense | | | 38 | | | 36 | | | 29 | | | 28 |
| | Obligations incurred | | | 6 | | | 9 | | | 6 | | | 3 |
| | Changes in estimated cash flow or settlement date | | | 123 | | | 31 | | | 1 | | | (7) |
| | Effect of foreign currency exchange rates | | | 1 | | | 1 | | | | | | |
| | Obligations settled | | | (15) | | | (22) | | | (7) | | | (8) |
| ARO at end of period | | $ | 705 | | $ | 552 | | $ | 404 | | $ | 375 |
| | | | | LKE | | LG&E | | KU |
| | | | | 2013 | | 2012 | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 131 | | $ | 118 | | $ | 62 | | $ | 57 | | $ | 69 | | $ | 61 |
| | Accretion expense | | | 7 | | | 6 | | | 3 | | | 3 | | | 4 | | | 3 |
| | Obligations incurred | | | | | | 6 | | | | | | | | | | | | 6 |
| | Changes in estimated cash flow | | | | | | | | | | | | | | | | | | |
| | | or settlement date | | | 122 | | | 15 | | | 17 | | | 5 | | | 105 | | | 10 |
| | Obligations settled | | | (8) | | | (14) | | | (8) | | | (3) | | | | | | (11) |
| ARO at end of period | | $ | 252 | | $ | 131 | | $ | 74 | | $ | 62 | | $ | 178 | | $ | 69 |
us-gaap:ScheduleOfChangeInAssetRetirementObligationTableTextBlock
The changes in the carrying amounts of AROs were as follows.
| | | | | PPL | | PPL Energy Supply |
| | | | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 552 | | $ | 497 | | $ | 375 | | $ | 359 |
| | Accretion expense | | | 38 | | | 36 | | | 29 | | | 28 |
| | Obligations incurred | | | 6 | | | 9 | | | 6 | | | 3 |
| | Changes in estimated cash flow or settlement date | | | 123 | | | 31 | | | 1 | | | (7) |
| | Effect of foreign currency exchange rates | | | 1 | | | 1 | | | | | | |
| | Obligations settled | | | (15) | | | (22) | | | (7) | | | (8) |
| ARO at end of period | | $ | 705 | | $ | 552 | | $ | 404 | | $ | 375 |
| | | | | LKE | | LG&E | | KU |
| | | | | 2013 | | 2012 | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 131 | | $ | 118 | | $ | 62 | | $ | 57 | | $ | 69 | | $ | 61 |
| | Accretion expense | | | 7 | | | 6 | | | 3 | | | 3 | | | 4 | | | 3 |
| | Obligations incurred | | | | | | 6 | | | | | | | | | | | | 6 |
| | Changes in estimated cash flow | | | | | | | | | | | | | | | | | | |
| | | or settlement date | | | 122 | | | 15 | | | 17 | | | 5 | | | 105 | | | 10 |
| | Obligations settled | | | (8) | | | (14) | | | (8) | | | (3) | | | | | | (11) |
| ARO at end of period | | $ | 252 | | $ | 131 | | $ | 74 | | $ | 62 | | $ | 178 | | $ | 69 |
us-gaap:ScheduleOfChangeInAssetRetirementObligationTableTextBlock
The changes in the carrying amounts of AROs were as follows.
| | | | | PPL | | PPL Energy Supply |
| | | | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 552 | | $ | 497 | | $ | 375 | | $ | 359 |
| | Accretion expense | | | 38 | | | 36 | | | 29 | | | 28 |
| | Obligations incurred | | | 6 | | | 9 | | | 6 | | | 3 |
| | Changes in estimated cash flow or settlement date | | | 123 | | | 31 | | | 1 | | | (7) |
| | Effect of foreign currency exchange rates | | | 1 | | | 1 | | | | | | |
| | Obligations settled | | | (15) | | | (22) | | | (7) | | | (8) |
| ARO at end of period | | $ | 705 | | $ | 552 | | $ | 404 | | $ | 375 |
| | | | | LKE | | LG&E | | KU |
| | | | | 2013 | | 2012 | | 2013 | | 2012 | | 2013 | | 2012 |
| | | | | | | | | | | | | | | | | | | | | |
| ARO at beginning of period | | $ | 131 | | $ | 118 | | $ | 62 | | $ | 57 | | $ | 69 | | $ | 61 |
| | Accretion expense | | | 7 | | | 6 | | | 3 | | | 3 | | | 4 | | | 3 |
| | Obligations incurred | | | | | | 6 | | | | | | | | | | | | 6 |
| | Changes in estimated cash flow | | | | | | | | | | | | | | | | | | |
| | | or settlement date | | | 122 | | | 15 | | | 17 | | | 5 | | | 105 | | | 10 |
| | Obligations settled | | | (8) | | | (14) | | | (8) | | | (3) | | | | | | (11) |
| ARO at end of period | | $ | 252 | | $ | 131 | | $ | 74 | | $ | 62 | | $ | 178 | | $ | 69 |
us-gaap:ScheduleOfChangeInAssetRetirementObligationTableTextBlock