Grid-interactive electric thermal storage (GETS) space and water heaters have an innovative communication and control system, when aggregated; provide ISO’s, utilities and aggregators the ability to precisely vary consumer energy usage to the real-time needs of the electric grid. With rapidly growing amounts of renewable energy, aggregated GETS systems with real time control are a low cost energy storage solution that provide precise visibility, measurement and controllability for these aggregated energy storage assets. This system of grid-edge storage provides electric grid managers the ability to integrate, manage and fully utilize renewable energy generation.