REGULATORY ASSETS AND LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2019

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of regulatory assets

(in millions)	September 30, 2019		December 31, 2018
Regulatory assets
Pension and OPEB costs	$	1,126.5	$	1,193.5
Plant retirements *	1,032.1		832.3
Environmental remediation costs	719.6		687.1
Income tax related items	451.0		369.1
SSR	320.1		316.7
Asset retirement obligations	222.5		185.4
Uncollectible expense	39.7		38.7
We Power generation	29.9		43.0
Electric transmission costs	16.6		58.1
Energy efficiency programs	5.1		14.0
Other, net	73.1		117.9
Total regulatory assets	$	4,036.2	$	3,855.8
Balance sheet presentation
Other current assets	$	36.3	$	50.7
Regulatory assets	3,999.9		3,805.1
Total regulatory assets	$	4,036.2	$	3,855.8

*

On March 31, 2019, the PIPP generating units were retired by WE. See Note 6, Property, Plant, and Equipment, for more information on the retirement of the PIPP units.

Schedule of regulatory liabilities

(in millions)	September 30, 2019		December 31, 2018
Regulatory liabilities
Income tax related items	$	2,358.6	$	2,406.6
Removal costs	1,313.3		1,329.6
Pension and OPEB benefits	227.1		238.3
Mines deferral	132.1		120.8
Decoupling	46.9		30.5
Energy costs refundable through rate adjustments	45.2		39.6
Energy efficiency programs	33.4		31.7
Uncollectible expense	32.3		30.5
Earnings sharing mechanisms	28.5		30.0
Derivatives	18.6		16.4
Other, net	12.2		14.4
Total regulatory liabilities	$	4,248.2	$	4,288.4
Balance sheet presentation
Other current liabilities	$	49.4	$	36.8
Regulatory liabilities	4,198.8		4,251.6
Total regulatory liabilities	$	4,248.2	$	4,288.4