The staff at SolarCity couldn’t have picked a better day to welcome guests to their new facility in West Norriton, Pennsylvania. Under cloudless skies, state and local officials were invited to tour the 20,000-square-foot operations center of the nation’s top solar provider, which opened in May. The operations center employs close to 50 salespeople, residential designers, surveyors and installers and is projected to more than double that number by adding a commercial design division and expanding to accommodate the region’s burgeoning solar market. Founded in 2006 by technologist brothers Pete and Lyndon Rive and their cousin, Elon Musk, the CEO of electric automotive giant Tesla, California-based SolarCity provides renewable electricity to homeowners, businesses and municipal entities through a business model that allows customers to save up to 20 percent on energy expenses by utilizing solar systems installed with no up-front costs.