Louisville’s solar tour is Saturday, and is bigger than it’s ever been.The annual event highlights residential and business properties that are using solar energy. Participants can take guided bus or bicycle tours, or download a guide and visit the properties on their own.Sarah Lynn Cunningham of the Louisville Climate Action Network said the event is meant to show people what’s already happening in Louisville with solar energy. This year, the tour will include 35 properties, ranging from homes to churches to an air pollution monitoring station. For the first time, solar installers are also included to talk to interested participants about the specifics of solar installation.“So that the people who are getting more serious about installing solar on their homes or businesses can meet with others who have made the same decision and the installer, so they can ask more specific of business or techie kind of questions,” Cunningham said.She added that the cost of installing solar panels is lower than ever and the technology is becoming more mainstream.“The way social epidemics work is that after the early adopters are followed by the second wave, by then almost everybody’s beginning to see, and it’s beginning to seem normal and more and more people decide to jump on and go with it,” she said.The guided tours begin at noon on Saturday. For more information, go here.