Greentech Media reports that interest is growing in hybrid approaches to energy storage. European companies such as Bosch and Younicos are working on projects that combine different battery technologies in a single system. Others are combining entirely different technologies, including phase change material. One example:
"Fraunhofer ISE says it has successfully tested a hybrid system that combines thousands of batteries and heat storage systems into a virtual storage system. The agent-based operation system has been developed and tested within the institute’s SmartEnergyLab facility.
"There, agent-based controllers manage a co-generation plant that also includes water storage, a heat pump with phase-change storage, and a lithium-ion battery system."