Revision Energy of Exeter installed another photovoltaic array in Andover last month. The 18 panels should provide about 5.4 kilowatts of electricity over the course of a year, enough to power the entire household. Any excess power goes into the New Hampshire Electric Co-op’s grid for other NHEC customers to use. Revision recently announced a new program that lets qualified homeowners add solar with no money down. Photo: Charlie Darling