Behavior change programs are becoming a common method for reducing energy consumption and increasing energy efficiency. But what types of programs are out there, why do they work (or fail to work), and how effective are they? This report updates the 2013 ACEEE Field Guide to Utility-Run Behavior Change Programs, with new program evaluations, an analysis of major behavior change strategies, and a focus on programs with evaluated energy savings. We surveyed 296 recent reports, academic studies, and program evaluations, and had more than 60 personal communications with program administrators, energy program managers, and other experts. The report will help program administrators understand the variety of behavior program options that are available to them, and the degree to which they successfully change behavior and save energy.