Solar energy is important to save electricity and cut cost. In order to cope with the increasing need, many solar companies launched in the United States. For example, the First Solar is the well-known market leaders in the United States that provide services and products. In the Bay Area, there are a lot of solar energy companies providing the service. Recent research from the San Francisco Business Times ranks the top Bay Area solar installers in terms of capitalization in stock market. Below we will rank the Bay Area Solar Companies.