Vermont may be a small state, but picking from its 69 solar companies may overwhelm homeowners. Based on our research, the best national solar companies in Vermont is Sunrun, while the best local installer is Green Mountain Solar. Other notable solar companies in Vermont are Catamount Solar, AllEarth Renewables and Waterbury-based SunCommon, an official Tesla Powerwall installer. Before selecting an installer for your solar project, we recommend requesting quotes from multiple solar providers.