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Megawatt-class power generation/storage system demonstrated

July 24, 2012
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TOKYO — Sumitomo Electric Industries, Ltd. says it has completed a megawatt-class electric power generation/storage system on the premises of its Yokohama Works. The system consists of the world''s largest redox flow battery and Japan''s largest concentrated photovoltaic (CPV) units.

For the development of this system, the Company has cooperated with Nissin Electric Co. Ltd., Sumitomo Densetsu Co., Ltd., and Meidensha Corp. in the respective technical fields.

The system consists of 28 units of CPV (maximum total power generation: 200 kW) and a redox flow battery (capacity: 1 MW x 5 hours), which respectively function as renewable energy sources and a storage facility of electric power generated by the CPV units. Connected to external commercial power networks, the system can also store electricity provided by power companies during the night. This system employs an energy management system (EMS), which monitors the amount of CPV-generated electric power, battery storage and power consumption, and stores the measurement data in the central server.

The system levels power consumption, enables a stable power supply, and balances fluctuations in solar power generation.

Sumitomo Electric says it also plans to start the demonstration test of a factory energy management system (FEMS), which combines the existing gas engine power generators with the redox flow battery and CPV units to form an optimal management system that controls the entire energy flow in the Yokohama Works. The Company will cooperate with Meidensha Corp. for the demonstration, which will be the first attempt in the Yokohama Smart City Project, one of the Next Generation Energy and Social System Demonstration Projects 2012 led by the Ministry of Economy, Trade and Industry (METI).

Sumitomo Electric is planning to put these systems into practical use, particularly for major power consumers such as industrial plants and commercial facilities, with the aim of promoting the use of renewable energy sources and effective use of energy. With a plan for the commercialization during the 2013 and 2014, the Company continues to work on cost reduction and other improvements for the system.

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