The document summarizes the top 5 solar installation companies in the Bay Area of California. 1) SolarCity is the largest residential and commercial solar installer in the Bay Area and nationwide. 2) RGS Energy is the second largest contributor in the Bay Area with over 2,287 projects. 3) Petersen-Dean Roofing and Solar has over 2,282 active systems and is a fully licensed roofing contractor. 4) Sungevity has over 1,398 installations and holds certifications for highest quality. 5) REC Solar has 1,297 total installations and specializes in large commercial systems.