The energy costs feature is part of Redfin's effort to provide a more complete package of information about its listings. Other new features have included adding zoning and land use data, climate risk data, down payment assistance information, school ratings, public transportation availability and internet service provider availability. "As forward-thinking businesses like Redfin realize how important energy cost reductions, rooftop solar, and sustainability solutions are to their customers, WattBuy is meeting this new need," WattBuy CEO Naman Trivedi, said in a statement.