In 1968, Consumers Power began construction of a nuclear power plant in Midland, Michigan, primarily for the Dow Chemical Company. However, construction issues caused delays and increased costs. The Three Mile Island accident in 1979 resulted in a massive change in nuclear regulatory requirements and system redesign. When it was revealed the containment buildings were settling and foundation cracks were discovered, Dow cancelled its contract with Consumers Power, and the project was abandoned in 1984. The $4.1 billion investment nearly bankrupted Consumers Power. However, in 1985, Consumers Power formed a partnership with eight other companies to convert Midland's abandoned nuclear plant into a natural gas-fired power plant. Transformation of the plant began in 1986 and was completed at a cost of $500 million. The Midland Cogeneration Venture began producing power in 1991 and that success restored faith in Consumers Power.