The Low Income Solar Policy Guide is a web-based resource dedicated to compiling best practices and resources for expanding solar access among low- and moderate-income communities. Fully enabling low-income solar participation requires policies and programs that are specifically designed to address the unique barriers faced by these communities. This guide provides an overview of those barriers, as well as underlying principles for successful programs, existing policy tools that can be used to create programs, and examples of state and local models that have successfully improved access.