ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2021

Asset Retirement Obligation Disclosure [Abstract]

Schedule of changes to our asset retirement obligations

The following table shows changes to our AROs during the nine months ended September 30, 2021:

(in millions)	Nine Months Ended September 30, 2021
Balance as of January 1, 2021	$	45.5
Accretion	1.3
Revisions to estimated cash flows	(8.9)		(1)
Balance as of September 30, 2021	$	37.9

(1)    This decrease was primarily due to revisions made to estimated cash flows for the legal requirement to dismantle, at retirement, our wind generation projects