This document discusses the evolving distribution system and increasing integration of distributed energy resources (DER). It describes a three stage evolution: 1) grid modernization through infrastructure upgrades and cost management, 2) DER integration through enabling technologies and customer tools, and 3) development of distributed markets and multi-party transactions. It also addresses the need for greater data visibility and collaboration as distribution systems transition to bidirectional networks. Regulators are focusing on distribution platforms, expanded customer services, and performance-based ratemaking to facilitate this evolution.