This paper introduces a novel testing environment that integrates unidirectional and bidirectional charging infrastructures into an existing hybrid energy storage system. For additional information about ST trademarks, please refer to www. They typically consist of a collection of battery units, associated power electronics, control systems, and safety equipment, which are used to store, manage, and release energy. Hybrid energy storage systems, in particular, are promising, as they combine two or more types of energy storage. . Founded in 1943, made a national laboratory in 1946. 1500-acre site southwest of Chicago. 7,900+ external facility users. Test Data from Component & Vehicle Testing, Planning Agencies. . Bidirectional electric vehicles (EV) employed as mobile battery storage can add resilience benefits and demand-response capabilities to a site's building infrastructure.