Established in 1978, DMI Industries is one of the largest manufacturers of wind towers in North America. The company has achieved ISO 9001:2000 certification and maintains several fabrication plants in the United States and Canada. It has aluminum and carbon and stainless steel manufacturing capabilities. DMI Industries is a Canadian Welding Board (CWB)-certified company and an American Welding Society (AWS)-certified welder and inspector. It manufactures equipment for the agricultural processing, biofuel production, heavy machinery manufacturing, mining, wind energy, and oil and gas extraction and processing industries. The company is an operating unit of Otter Tail Corporation, which has interests in various operations, including electric utility, manufacturing, health services, food ingredient processing, transportation and construction.