Mitsubishi Electric Corp. has delivered what it claims is the world’s largest energy storage system to Japanese power vendor Kyushu Electric Power Co. The system—with 50 MW output and 300 MWh rated capacity—is part of a pilot project to balance supply and demand via high-capacity energy storage systems, and was installed at the Buzen Substation in Buzen, Fukuoka Prefecture in Japan.

The system smooths variations in frequency and power flow caused by renewable generation via battery control. In addition, it enables efficient operation via power supply control through the coordinated use of multiple-generation sources and batteries, as well as technology for optimizing operation, stoppage timing and output of the various sources.

Sodium-sulfur Battery