Tour features open house tours of San Diego Renewable Energy Society’s 16 energy-smart homes and businesses showcasing the gamut of energy efficiency and solar solutions San Diegans are employing to slash utility bills, power their electric vehicles (EVs), improve property values, and reap rich tax credits and cash rebates. Residential (Friday): Homeowners and qualified contractors will be on-hand at 10 residential sites across the county. Commercial (Saturday): an interactive, behind-the-scenes tour of six cost-cutting energy solutions. Green Bag lunch provided. 858-220-3317.