REGULATORY ASSETS AND LIABILITIES

3 Months Ended

Mar. 31, 2019

Regulatory Assets and Liabilities Disclosure [Abstract]

REGULATORY ASSETS AND LIABILITIES

REGULATORY ASSETS AND LIABILITIES

The following regulatory assets and liabilities were reflected on our balance sheets at March 31, 2019 and December 31, 2018. For more information on our regulatory assets and liabilities, see Note 5, Regulatory Assets and Liabilities, in our 2018 Annual Report on Form 10-K.

(in millions)	March 31, 2019		December 31, 2018
Regulatory assets
Pension and OPEB costs	$	1,173.8	$	1,193.5
Plant retirements *	1,027.9		832.3
Environmental remediation costs	697.6		687.1
Income tax related items	384.8		369.1
SSR	317.9		316.7
Asset retirement obligations	223.4		185.4
Uncollectible expense	47.6		38.7
Electric transmission costs	41.7		58.1
We Power generation	36.1		43.0
Energy efficiency programs	11.3		14.0
Other, net	75.0		117.9
Total regulatory assets	$	4,037.1	$	3,855.8
Balance sheet presentation
Other current assets	$	27.3	$	50.7
Regulatory assets	4,009.8		3,805.1
Total regulatory assets	$	4,037.1	$	3,855.8

* On March 31, 2019, the PIPP generating units were retired by WE. See Note 5, Property, Plant, and Equipment, for more information on the retirement of the PIPP units.

(in millions)	March 31, 2019		December 31, 2018
Regulatory liabilities
Income tax related items	$	2,401.2	$	2,406.6
Removal costs	1,330.8		1,329.6
Pension and OPEB costs	235.7		238.3
Mines deferral	129.1		120.8
Energy costs refundable through rate adjustments	103.0		39.6
Decoupling	51.0		30.5
Energy efficiency programs	45.7		31.7
Earnings sharing mechanisms	29.9		30.0
Uncollectible expense	29.5		30.5
Derivatives	9.0		16.4
Other, net	13.3		14.4
Total regulatory liabilities	$	4,378.2	$	4,288.4
Balance sheet presentation
Other current liabilities	$	103.9	$	36.8
Regulatory liabilities	4,274.3		4,251.6
Total regulatory liabilities	$	4,378.2	$	4,288.4