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The Boston area's top 15 innovators

Sam White Co-founder, Promethean Power Systems, Cambridge White helped open up a grungy and grassroots-oriented cleantech incubator in East Cambridge last summer. Its residents are a handful of start-ups, many with links to MIT, including White's company, which is building a solar-powered milk chiller that he says will help dairy farmers in developing countries get a better price for their product.
Wendy Maeda/Globe Staff
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By Scott Kirsner, Globe Correspondent

Sam White

Co-founder, Promethean Power Systems, Cambridge

White helped open up a grungy and grassroots-oriented cleantech incubator in East Cambridge last summer. Its residents are a handful of start-ups, many with links to MIT, including White's company, which is building a solar-powered milk chiller that he says will help dairy farmers in developing countries get a better price for their product.