US: Louisville's Charah Inc uses by-product gypsum from a local coal plant to make a fertiliser, SUL4R-PLUS, which is used by domestic and international farmers. Charah has now announced plans to expand its operations as demand grows.
In April 2013, Charah opened a US$14m plant at Mill Creek Generating Station in Louisville to produce SUL4R-PLUS after recognising a market for it in the agricultural industry. The sulphur content in local soil has fallen significantly in recent years as high-yield farming has pulled more of it out of the ground.
Charah gets gypsum powder from the Mill Creek facility and makes it into fertiliser pellets using several additives. It then sells the pellets to distributors. SUL4R-PLUS is now used in several states, including Texas, Wisconsin, Florida and other countries, including Canada and the Dominican Republic.
Due to its popularity, company officials have stated that they plan to expand operations with the introduction of a second production line at the Mill Creek production facility. In the future, it could also build production lines at other power plants it works with around the country.
