Gray said the gypsum that comes from power plants can be sticky and is not easily spread using farming equipment. Charah adds a binder to the dried gypsum and forms it into pellets. The product is called SUL4R-PLUS, and Charah said it dissolves faster that other sulfur-based fertilizers.
"It spreads just like fertilizer," Gray said.
Vic Staffieri, LG&E chief executive officer, said reusing the gypsum and shipping it away reduces the utility's storage needs and lowers customer costs.
The Mill Creek plant is also currently undergoing a $940 million upgrade to its pollution controls. The plant burns about 4 million tons of coal a year that comes mostly from western Kentucky, where coal has a higher sulfur content than coal mined in eastern Kentucky and other parts of the Appalachia.