Asset Retirement Obligation (Tables)

9 Months Ended

Sep. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations

The following table describes the changes to the Company’s ARO for the nine months ended September 30, 2017:

Puget Energy and Puget Sound Energy
(Dollars in Thousands)	Changes in ARO
Balance at December 31, 2016	$	200,345
New asset retirement obligation recognized in the period1	2,881
Liability adjustments	(1,035		)
Revisions in estimated cash flows	(18,462		)
Accretion expense	4,126
Balance at September 30, 2017	$	187,855

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^{1  New asset retirement obligations include $1.4 million ARO for Puget LNG only held at Puget Energy.}