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REGULATORY ASSETS AND LIABILITIES | 6 Months Ended
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Jun. 30, 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 June 30, 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) |  | 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.
(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 |

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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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