19. Asset Retirement Obligations

(PPL)

WPD has recorded conditional AROs required by U.K. law related to treated wood poles, gas-filled switchgear and fluid-filled cables.

(PPL and PPL Electric)

PPL Electric has identified legal retirement obligations for the retirement of certain transmission assets that could not be reasonably estimated due to indeterminable settlement dates. These assets are located on rights-of-way that allow the grantor to require PPL Electric to relocate or remove the assets. Since this option is at the discretion of the grantor of the right-of-way, PPL Electric is unable to determine when these events may occur.

(PPL, LKE, LG&E and KU)

LG&E's and KU's AROs are primarily related to the final retirement of assets associated with generating units. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. As described in Notes 1 and 6, for LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability.

The changes in the carrying amounts of AROs were as follows:



	PPL						LKE						LG&E						KU
	2017			2016			2017			2016			2017			2016			2017			2016
ARO at beginning of period	$	488		$	586		$	433		$	535		$	145		$	175		$	288		$	360
Accretion	21			24			20			22			7			7			13			15
Changes in estimated timing or cost (a)	(73		)	(84		)	(54		)	(95		)	(8		)	(19		)	(46		)	(76		)
Effect of foreign currency exchange rates	4			(9		)	—			—			—			—			—			—
Obligations settled	(43		)	(29		)	(43		)	(29		)	(23		)	(18		)	(20		)	(11		)
ARO at end of period	$	397		$	488		$	356		$	433		$	121		$	145		$	235		$	288

(a)

LKE recorded decreases of $60 million ($52 million at KU and $8 million at LG&E) and $114 million ($90 million at KU and $24 million at LG&E) to the existing AROs during 2017 and 2016 related to the closure of CCR impoundments. These revisions are the result of changes in closure plans related to expected costs and timing of closures. Further changes to AROs, capital plans or operating costs may be required as estimates of future cash flows are refined based on closure developments and regulatory or legal proceedings.

See Note 13 for information on the final CCR rule and Note 6 for information on the rate recovery applications.