David Crane and RFK Jr. write in the NYT:
... state regulatory agencies and local governments impose burdensome permitting and siting requirements that unnecessarily raise installation costs. Today, navigating the regulatory red tape constitutes 25 percent to 30 percent of the total cost of solar installation in the United States, according to data from the National Renewable Energy Laboratory, and, as such, represents a higher percentage of the overall cost than the solar equipment itself.