With around a third of our homes now sporting a solar array, Australia leads the world by far in solar installations. Recent research has looked at what makes people install solar and found some very surprising factors. Postcodes with higher rates of unemployed have higher rates of rooftop solar, for instance, and the more solar panels you see in your neighbourhood, the more likely you are to install them yourself. Kaveh Khalilpour is one of the report’s researchers and an Associate Professor in Engineering at the University of Technology in Sydney.