 Dow ceased operations at its Sarnia site in 2009 . The plant was decommissioned , and the land has been sold to neighbouring <unk> Energy Corporation . <unk> produces power and steam for industry , and is the largest natural gas co @-@ generation plant in Canada . It has created the Bluewater Energy Park on the former Dow site . Lanxess produces more than 150 @,@ 000 tonnes ( 170 @,@ 000 short tons ; 150 @,@ 000 long tons ) of butyl rubber annually at its Sarnia location , and is the sole producer of regulatory @-@ approved , food @-@ grade butyl rubber , used in the manufacture of chewing gum . Within the boundaries of its Sarnia plant Lanxess has also created the <unk> @-@ industrial Park Sarnia . 
