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Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations

In the first quarter of 2020, APS recognized an ARO for its share of corrective action and water monitoring costs at Four Corners and the Navajo Plant (see additional details in Notes 4 and 8), which resulted in a decrease to the ARO of $11 million for Four Corners and an increase to the ARO of $5 million for the Navajo Plant.

The following schedule shows the change in our asset retirement obligations for the six months ended June 30, 2020 (dollars in thousands): 

 
2020
Asset retirement obligations at January 1, 2020
$
657,218

Changes attributable to:
 

Accretion expense
20,410

Settlements
(4,324
)
Estimated cash flow revisions
(5,352
)
Asset retirement obligations at June 30, 2020
$
667,952



In accordance with regulatory accounting, APS accrues removal costs for its regulated utility assets, even if there is no legal obligation for removal.  See detail of regulatory liabilities in Note 4.