While flashy alternative energy companies with gee-whiz technologies have foundered in recent years, George P. Sakellaris’s company, Ameresco Inc. of Framingham, has grown, prospered, and significantly reduced carbon footprints by doing boring things, such as changing lighting and replacing water heaters. Even as Marlborough solar panel maker Evergreen Solar Inc. went bankrupt, and advanced battery-maker A123 Systems of Waltham has burned through cash, Ameresco’s revenues have nearly doubled and its profits more than tripled over the past five yea
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