The Interior Department and Department of Energy are currently engaged in a large-scale plan for solar development that proposes to open up 21.5 million acres of public land to permit applications by industrial-scale solar developers. Projects will include large-scale PV and CSP plants. Much of the land being targeted is in fragile desert areas that support rare and endangered plant and animal species. And while the developments are expected to have operational lifetimes of just 30 to 50 years, their impacts will be permanent, irreversibly converting the land to industrial zones.