But moving from "wet" handling of ash, such as ponds, to "dry handling," such as lined landfills, has its own costs. According to a 2013 report from the Rainforest Action Network and BankTrack, these costs include capital spending of $10 million to $30 million per plant to convert one type of coal ash, fly ash, from wet to dry handling, and $20 million to $40 million per unit at a plant to convert another type, bottom ash. Closing a pond has stranded asset costs of up to $1 million per acre, the report said. The Dan River pond covers about 27 acres, according to a report from The Associated Press.
The report listed Duke as having 24 coal ash ponds with "significant" or "high" hazard ratings, the most of any electric power producer, with TVA in second place with 19 ponds.
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