Since the start of the Utility Variable-Generation Integration Group (UVIG) in 1989, it has adapted as the industry has evolved from an initial focus on the analysis of wind for utility applications to impacts of increased solar and other distributed generation to now other energy sources, such as battery systems. This advisory reviews the evolution of this organization, and how UVIG is now changing its name to the Energy Systems Integration Group (ESIG) to keep up with industry changes.