Community solar – the concept of leasing or owning a share of a large solar array rather than having a personal solar installation on your rooftop – continues to gain popularity across the continental United States. According to the Solar Energy Industry Association (SEIA), there will be a 1.8 gigawatt (GW) increase in installed photovoltaics from community solar arrays over the next five years. Minnesota, Colorado, California and Massachusetts – the undisputed best states for community solar – will drive the majority of that growth. You might wonder, why are these four states so ideal for roofless solar compared to the 46 others in the U.S.? Here’s how these community solar leaders rose to the top.