GS Yuasa Corporation (Tokyo Stock Exchange: 6674) has received an order from ENEOS Corporation for lithium-ion storage battery systems (hereinafter called "these storage systems") for use in power grid stabilization as part of the construction of the new ENEOS VPP* business structure. These storage systems will be installed at the ENEOS Muroran Plant and Chiba Refinery of Osaka International Refining Company, Limited, which is part of the ENEOS Group. These storage systems have a total capacity of 290 MWh (88 MWh for the ENEOS Muroran Plant and 202 MWh for Chiba Refinery of Osaka International Refining Company), making this Japan’s largest-scale installation of lithium-ion batteries stored in outdoor containers for use as a storage battery system for the power grid.

The introduction of renewable energy has been increasing in recent years. However, there are some issues, such as instability in the power supply and demand balance in the power system because the amount of electricity generated varies depending on the weather and the time, and the need to control the power generation output when the demand for electricity is low. These storage systems contribute to the maximum utilization of renewable energy by adjusting the power supply balance and stabilizing the power system by recharging and discharging power to the grid to which they are connected.

These storage systems are equipped with the “LEPS-2-14” lithium-ion battery for industrial use which is manufactured by GS Yuasa. The receipt of this order was secured as a result of a favorable evaluation of the quality, safety measures, and prompt after-sales service system of GS Yuasa products.

GS Yuasa will continue contributing to the field of power supply stabilization through expanding sales of its lithium-ion battery power storage systems. By helping to facilitate power grid adjustment capabilities, GS Yuasa is also contributing to further expansion of renewable energy use in support of Japan’s commitment to achieving carbon neutrality by 2050.

* Abbreviation of Virtual Power Plant. This refers to a system where distributed energy resources (private power generation facilities such as renewable energy and thermal power generation facilities/storage batteries/electric vehicles) are all controlled together remotely and in an integrated manner, to provide functions as if they were a single power plant.

1. High level of safety ensured as voltage of all cells can be monitored and temperatures of all modules can be controlled
2. As the modules are fan-less, malfunctions are less likely to occur and the number of parts requiring replacement has been substantially reduced
3. Modules housed in fire prevention ordinance compliant cubicles in accordance with relevant laws and regulations
4. Able to withstand severely cold climatic conditions

Constant voltage monitoring and failure monitoring are performed on all of the cells to ensure the reliability of the entire system. In the event of a malfunction, GS Yuasa utilizes its nationwide service network (one of Japan’s largest) to promptly respond to customer needs.