ICI Castner Kellner, now Ineos Chlor industrial chemical works, Mersey / Weaver River, Western Point, Runcorn, Halton, Cheshire, England, UK at dusk

Runcorn's chemical industry was dominated for many years by ICI's Chlor Chemical division. But since 2001, Inovyn (a wholly owned subsidiary of Ineos) has operated the extensive chemical works in the west of the town, employing 750 people in 2020. In Runcorn, Invoyn manufactures chlorine, caustic soda and chlorinated derivatives. It also produces salt, made from brine transported by pipeline from the saltfields of central Cheshire, and sulphuric acid. Several other chemical manufacturers also have a presence at the site, including Koura (formerly Mexichem Fluor), Industrial Chemicals, Packed Chlorine Limited, VYNOVA and Runcorn MCP Ltd (a joint venture between INOVYN and VYNOVA). The site is considered to be of strategic national importance to the UK. The site includes two independently owned power stations; the 810 MW natural gas fired Rocksavage Power Station and the Runcorn Energy Recovery Facility operated by Viridor which also supplies heat to the Inovyn facility. ICI's other former site in Runcorn comprising offices and laboratories is now the Heath Business and Technical Park, which provides office, laboratory, conference, and leisure facilities