REGULATORY ASSETS AND LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2019

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of regulatory assets

(in millions)	June 30, 2019		December 31, 2018
Regulatory assets
Pension and OPEB costs	$	1,153.3	$	1,193.5
Plant retirements *	1,031.7		832.3
Environmental remediation costs	707.6		687.1
Income tax related items	424.6		369.1
SSR	319.0		316.7
Asset retirement obligations	212.2		185.4
Uncollectible expense	43.6		38.7
We Power generation	38.6		43.0
Electric transmission costs	25.6		58.1
Energy efficiency programs	8.9		14.0
Other, net	70.2		117.9
Total regulatory assets	$	4,035.3	$	3,855.8
Balance sheet presentation
Other current assets	$	28.3	$	50.7
Regulatory assets	4,007.0		3,805.1
Total regulatory assets	$	4,035.3	$	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)	June 30, 2019		December 31, 2018
Regulatory liabilities
Income tax related items	$	2,389.6	$	2,406.6
Removal costs	1,304.7		1,329.6
Pension and OPEB costs	231.2		238.3
Mines deferral	130.5		120.8
Energy costs refundable through rate adjustments	90.1		39.6
Decoupling	48.7		30.5
Energy efficiency programs	42.0		31.7
Uncollectible expense	31.9		30.5
Earnings sharing mechanisms	30.0		30.0
Derivatives	17.5		16.4
Other, net	14.2		14.4
Total regulatory liabilities	$	4,330.4	$	4,288.4
Balance sheet presentation
Other current liabilities	$	86.8	$	36.8
Regulatory liabilities	4,243.6		4,251.6
Total regulatory liabilities	$	4,330.4	$	4,288.4