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REGULATORY ASSETS AND LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2018
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of regulatory assets | 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 |  | $ | 1,071.0 |  |  | $ | 1,142.0 |
Plant retirements (2) |  | 778.4 |  |  | 15.1 |
Environmental remediation costs |  | 680.0 |  |  | 676.6 |
System support resource |  | 315.0 |  |  | 298.9 |
Income tax (3) |  | 272.0 |  |  | 15.7 |
Asset retirement obligations |  | 224.1 |  |  | 192.2 |
Electric transmission costs (4) |  | 124.0 |  |  | 221.0 |
We Power generation |  | 48.7 |  |  | 71.3 |
Uncollectible expense |  | 39.3 |  |  | 35.1 |
Energy efficiency programs |  | 15.7 |  |  | 24.6 |
Other, net |  | 105.6 |  |  | 147.9 |
Total regulatory assets |  | $ | 3,673.8 |  |  | $ | 2,840.4 |
Balance Sheet Presentation |  |  |  |
Current assets |  | $ | 30.3 |  |  | $ | 37.2 |
Regulatory assets |  | 3,643.5 |  |  | 2,803.2 |
Total regulatory assets |  | $ | 3,673.8 |  |  | $ | 2,840.4 |
(1) | Based on prior and current rate treatment, we believe it is probable that our utilities 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 6, Property, Plant, and Equipment.
(3) | For information on the flow through of tax repairs and the regulatory treatment of the Tax Legislation in our various jurisdictions, see Note 22, Regulatory Environment.
(4) | In May 2018, the PSCW issued an order requiring WE to use a portion of its tax benefits related to the Tax Legislation that was signed into law in December 2017 to reduce its transmission regulatory assets. See Note 22, Regulatory Environment, for more information.
Schedule of regulatory liabilities | 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 * |  | $ | 2,279.1 |  |  | $ | 2,134.1 |
Removal costs |  | 1,313.4 |  |  | 1,294.9 |
Mines deferral |  | 115.4 |  |  | 95.1 |
Unrecognized pension and OPEB costs |  | 106.5 |  |  | 114.2 |
Energy efficiency programs |  | 30.0 |  |  | 21.1 |
Energy costs refundable through rate adjustments |  | 25.2 |  |  | 42.0 |
Uncollectible expense |  | 23.9 |  |  | 24.7 |
Decoupling |  | 22.8 |  |  | 1.8 |
Earnings sharing mechanisms |  | 20.6 |  |  | 2.5 |
Other, net |  | 49.0 |  |  | 30.0 |
Total regulatory liabilities |  | $ | 3,985.9 |  |  | $ | 3,760.4 |
Balance Sheet Presentation |  |  |  |
Current liabilities |  | $ | 25.6 |  |  | $ | 41.8 |
Regulatory liabilities |  | 3,960.3 |  |  | 3,718.6 |
Total regulatory liabilities |  | $ | 3,985.9 |  |  | $ | 3,760.4 |
* | For information on the regulatory treatment of the Tax Legislation in our various jurisdictions, see Note 22, Regulatory Environment.

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