In Brooklyn, you can buy solar power right off your neighbor’s roof. A startup is revolutionizing the way homeowners buy and sell electricity. They are making it possible to auction rooftop solar power directly to your neighbors, creating a market for home-grown clean energy. Here’s why this is a big deal. Traditionally, a centralized utility would sell electricity to numerous homes and businesses. There was one seller and many buyers. Rooftop solar is disrupting that model as it allows anyone to generate their own power. The Brooklyn initiative goes one step further, allowing consumers to sell power directly to each other.