The Interconnection Guide for Distributed Generation provides information on the Massachusetts interconnection process for customers and developers. This process is an essential step when installing solar, small wind, and other on-site generation technologies classified as distributed generation (DG). Each distributed generation installation must be reviewed and approved for interconnection to the distribution system by the local electric utility and appropriate local municipal inspectors. This guide explains the basics of distributed generation and how the electric grid works. It also provides detailed information on the interconnection process.