Michigan-Made Dow Powerhouse Solar Shingles Now Available In MichiganDow Solar, a business unit of Midland-based Dow Chemical Co. (NYSE: DOW), has announced a major expansion of the availability of Dow Powerhouse Solar Shingles, an award-winning, Michigan-made, residential solar roofing system that protects like a standard shingle, but also has embedded solar cells to power the home.