Distributed Energy Resource (DER) adoption—including solar PV, battery storage, electric vehicles, and responsive loads—continues to expand globally. Distributed solar PV alone is poised to add an average of 4 GW per year in 2019 through 2021 in the United States, increasing installed capacity by about 60% relative to 2018. Distributed battery energy storage is on a similar path, with a likely doubling of capacity from 2018 to 2020. The transition to managing more resources at the grid edge comes with numerous risks and opportunities for electric utilities and providers of enabling technology and services. What key factors will set the pace of transition? How radically will the industry be transformed and in what time frame? What lessons can be drawn from regions where DER penetration is already significant?