LOUISVILLE, Ky. (WDRB) -- LG&E is closing its coal ash ponds at its power plants in Louisville and Trimble County.

The utility company will cap and fill the ash ponds with construction starting later this year.

The pond at the Mill Creek plant in southern Jefferson County will be capped by 2020, and the Trimble County plant will be capped by 2023. 

LG&E has to make the changes to meet federal environmental standards, but it will cost the company more than $300 million to do it.

And customers will pick up the tab. 

The Kentucky Public Services Commission approved monthly rate hikes which range from 30 cents to more than $2 over the next eight years

It will appear as a surcharge on a customer's electric bill.

To see the break down of the surcharge per year, see the document below:

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