Energy IoT Reference Architecture will help propel the energy industry to a truly scalable digital world. This book discusses a new way to architect solutions for the Electricity Industry using a modern, event-driven, standards-based distributed architecture to simplify and abstract communications with utility, customer, and third-party owned clean energy assets. With descriptions of the architectural and technological problems of the 20th Century centralized model, the book provides a pragmatic alternative architecture with examples of how to seamlessly integrate large numbers of Distributed Energy Resources (DER) with centralized systems that take advantage of intelligent edge devices through coordination instead of direct command and control. The book references DOE's Laminar Grid Architecture philosophy and the IEEE 2030.5 Protocol and shows how the Energy IoT Reference Architecture is aligned to solve today's biggest Electricity Industry problems. This is a must-have resource for architects, engineers, software developers, government officials, undergraduate students, and professors.