Japan Storage Battery Co., Ltd. Signs Agreement with Tamana City on Power Supply Using Grid-Scale Batteries During Disasters

Japan Storage Battery Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; President: Shuichi Urushibara; hereinafter 'the Company'), together with Remixpoint Co., Ltd. (Headquarters: Minato-ku, Tokyo; CEO: Yoshihiko Takahashi), signed a disaster response agreement with Tamana City, Kumamoto Prefecture on June 3, Reiwa 8 (2026), and held a signing ceremony on the same day. This agreement aims to utilize a grid-scale storage station being developed in Tamana City through a fund jointly established by the Company and Remixpoint during disasters to support the improvement of regional disaster prevention capabilities and the continuity of citizen services.

Left: Tamana City Mayor Takahiro Kurahara Center: Remixpoint Co., Ltd., Director and Head of Storage Solutions Division, Masato Akita Right: Japan Storage Battery Co., Ltd., President Shuichi Urushibara

[Outline of Signing Ceremony for Agreement on Power Supply Using Grid-Scale Batteries During Disasters] Date & Time: June 3, Reiwa 8 (Wednesday) 13:00~ Location: Tamana City Hall Attendees: Tamana City Mayor Takahiro Kurahara Remixpoint Co., Ltd., Director and Head of Storage Solutions Division, Masato Akita Japan Storage Battery Co., Ltd., President Shuichi Urushibara

<Agreement Content> Tamana City and both companies will collaborate to establish a power supply support system in the event of a disaster, aiming to strengthen the regional disaster prevention system and improve citizen services.

▲Signing ceremony scene

<About the Disaster Prevention Partnership Agreement> A disaster prevention partnership agreement is a collaboration between local governments and private companies or organizations to prepare for large-scale disasters, power outages, and other emergencies. It aims to pre-establish support systems such as material provision, personnel dispatch, and power supply.

<What is a Grid-Scale Battery?> Grid-scale batteries are large-scale storage facilities installed to effectively utilize renewable energy and maintain the balance of electricity supply and demand. Connected to the power grid (transmission and distribution networks), they charge when there is excess power and discharge as needed, drawing attention as a key facility supporting the stable operation of solar and wind power generation, which have large output fluctuations.

<About Emergency Use> Grid-scale storage stations are equipped with external outlets (power strips). In an emergency, a qualified person (electrical chief engineer) can operate the system on-site to supply stored power externally. This power can be used to charge portable batteries, smartphones, laptops, and other devices necessary for information gathering and communication.

Available Power Supply It is said that a two-person household needs about 17 kWh (approximately 5.6 kWh per day) for 72 hours during an emergency. With the planned storage station of approximately 8 MWh (8,146 kWh) capacity, it can supply power for about 470 households for 72 hours. Such storage stations are expected to play an important role as regional infrastructure during disasters.

<About Japan Storage Battery Co., Ltd.> The Company focuses on promoting grid-scale batteries that support 'adjustment capacity' in energy and electricity. It has three main business pillars: - Construction of Storage Stations In installing grid-scale batteries, the Company finds suitable sites and handles all coordination and arrangements with electric power companies necessary to start the project. It also selects and arranges construction contractors and optimal battery solutions for the site, promoting installation and building reliable storage stations. - Operation and Maintenance To support stable operation of grid-scale batteries, the Company conducts legal inspections and monitoring, aiming for long-term safe operation. In the battery storage business requiring over 20 years of operation, long-term stability is crucial. The Company leverages accumulated operational know-how and collaborates with optimal partners for each station to realize a safe and durable environment. - Market Creation To make the grid-scale battery business sustainable, the Company aims to create new markets. Through these markets, it seeks to create an environment where companies and investors can easily participate, contributing to Japan's stable energy supply together with many partners.

Future Initiatives Japan's power supply relies on fossil fuel thermal power generation for over 70%. To achieve a sustainable society, it is important to replace this with renewable energy and reduce CO2 emissions. The Company aims to contribute to solving these issues by promoting storage stations utilizing grid-scale batteries and providing adjustment capacity. Additionally, by selling storage stations as financial products and building a system that allows more people to participate easily, it will realize initiatives supporting sustainable growth. The Company plans to start operation of 70 storage facilities by 2028.

[Company Overview] ■ Remixpoint Co., Ltd. Company Name: Remixpoint, inc. Representative: President and CEO Yoshihiko Takahashi Location: Sumitomo Shin-Toranomon Building, 4-3-9 Toranomon, Minato-ku, Tokyo Business: Energy solution business, digital asset management business URL: https://www.remixpoint.co.jp

Japan Storage Battery Co., Ltd. Company Name: Japan Storage Battery Co., Ltd. Representative: President Shuichi Urushibara Location: Kasumigaseki Building 13F, 3-2-5 Kasumigaseki, Chiyoda-ku, Tokyo Business: Development and operation of grid-scale storage stations URL: https://www.nipponchikudenchi.co.jp/