SustainabilityHow rooftop solar and big utilities can co-existBy Marjorie SunOctober 24, 2013/2013/10/24/sustainability/how-rooftop-solar-and-big-utilities-can-co-existSTR/AFP/Getty ImagesRooftop solar installations cut into utilities' revenue, but still use their expensive grid and and rely on them for backup power. ListenreadDownloadDownload