REGULATORY ASSETS AND LIABILITIES

The following regulatory assets were reflected on our balance sheets at September 30, 2018 and December 31, 2017. For more information on our regulatory assets, see Note 4, Regulatory Assets and Liabilities, in our 2017 Annual Report on Form 10-K.



(in millions)	September 30, 2018		December 31, 2017
Regulatory assets ⁽¹⁾
Unrecognized pension and OPEB costs	$	149.2	$	161.3
Environmental remediation costs	117.2		116.0
Termination of a tolling agreement with Fox Energy Company LLC	23.1		27.2
Plant retirements ⁽²⁾	17.3		8.3
Asset retirement obligations	12.1		9.7
De Pere Energy Center	11.1		14.0
Income tax	8.5		8.2
Crane Creek wind project production tax credits ⁽³⁾	3.4		22.8
Other, net	30.1		15.3
Total regulatory assets	$	372.0	$	382.8

Balance Sheet Presentation
Current assets	$	5.4	$	—
Regulatory assets	366.6		382.8
Total regulatory assets	$	372.0	$	382.8


⁽¹⁾	Based on prior and current rate treatment, we believe it is probable that we will continue to recover from customers the regulatory assets in this table.


⁽²⁾	For information on the retirement of our older and less efficient fossil fuel generating units, see Note 5, Property, Plant, and Equipment.


⁽³⁾	In May 2018, the PSCW issued an order requiring us to use a portion of our tax benefits from the Tax Legislation that was signed into law in December 2017 to reduce the regulatory assets related to our Crane Creek wind project production tax credits. See Note 19, Regulatory Environment, for more information.

The following regulatory liabilities were reflected on our balance sheets at September 30, 2018 and December 31, 2017. For more information on our regulatory liabilities, see Note 4, Regulatory Assets and Liabilities, in our 2017 Annual Report on Form 10-K.



(in millions)	September 30, 2018		December 31, 2017
Regulatory liabilities
Income tax ⁽¹⁾	$	395.0	$	393.8
Removal costs	238.8		238.9
Unrecognized pension and OPEB costs	29.0		30.2
Electric transmission costs	9.9		6.0
Earnings sharing mechanism ⁽²⁾	8.5		—
Energy costs refundable through rate adjustments	6.2		8.2
Other, net	18.0		20.1
Total regulatory liabilities	$	705.4	$	697.2

Balance Sheet Presentation
Current liabilities	$	—	$	7.9
Regulatory liabilities	705.4		689.3
Total regulatory liabilities	$	705.4	$	697.2


⁽¹⁾	For information on the regulatory treatment of the Tax Legislation, see Note 19, Regulatory Environment.


⁽²⁾	For information on our earnings sharing mechanism, see Note 19, Regulatory Environment.