The project, which will use Imergy’s vanadium redox flow battery technology, is SunEdison's first commercial large-SunEdison has signed a 10-year agreement with Ontario's Independent Electricity System Operator (IESO) to supply 5 MW/20 MWh of energy storage to the province. SunEdison said that the IESO intends to use data from the energy storage project to analyze how storage can be used to smooth the power flow from wind and solar, defer expensive system upgrades, and ultimately shape the future of its grid. The project, which will use Imergy’s vanadium redox flow battery technology, is SunEdison's first commercial large-scale, grid-connected energy storage project, and is one of the first commercial applications of flow batteries in Canada.scale, grid-connected energy storage project, and is one of the first commercial applications of flow batteries in Canada.