PowerX, Inc., and ITOCHU Corporation have secured an order to supply 30 grid-scale battery energy storage systems totaling 75.2 MWh of combined storage capacity for the Miyagi Shiroishi Battery Farm in Shiroishi City, Miyagi Prefecture, Japan.

The project marks a continued expansion of the two companies joint energy storage offering in the Japanese market and is expected to enter commercial operation within fiscal year 2028.

Project Overview and Development Structure

The Miyagi Shiroishi Battery Farm is an extra-high-voltage battery storage project being developed by Miyagi Shiroishi Battery Farm LLC, a project company funded by Tokyu Land Corporation and IBeeT Corporation.

Once operational, the facility will connect to the Tohoku-area power grid to charge and discharge electricity, supporting power supply-demand balancing and facilitating the further integration of renewable energy across the region.

The project has also received government backing. Japan's Ministry of Economy, Trade, PowerX, Trade, and Industry selected the facility to receive a subsidy under its FY2025 Subsidy Program for Supporting the Introduction of Energy Storage Systems to Promote the Adoption of Renewable Energy, providing an additional layer of financial support for the development.

Technology and System Specifications

The order covers 30 units of PowerX's Mega Power 2500 battery energy storage system, deployed through the co-branded "PowerX × Bluestorage" package that PowerX and ITOCHU jointly offer to the market.

Each unit is housed in a 10-foot ISO-standard container and uses lithium iron phosphate, or LFP, battery chemistry, with a nominal capacity of 2,507 kWh per unit.

Across the 30 containers, the installation will deliver a total storage capacity of 75.2 MWh and a power conversion system output of 23 MW. According to the two companies, the total storage capacity is equivalent to the daily electricity consumption of approximately 7,000 average Japanese households, illustrating the scale of the project's contribution to local energy needs.

The choice of LFP technology is consistent with broader industry trends in grid-scale storage applications, where the chemistry is valued for its thermal stability and cycle life characteristics.

The use of standardized 10-foot ISO containers also points to a modular deployment approach that can streamline logistics and installation at the Shiroishi City site.

Partnership Between PowerX and ITOCHU

The Miyagi Shiroishi Battery Farm order represents a continuation of the commercial relationship between PowerX and ITOCHU in Japan's energy storage sector.

The two companies have structured their collaboration around the joint "PowerX × Bluestorage" product offering, which bundles PowerX's hardware with ITOCHU's trading and distribution capabilities to reach project developers and investors in the Japanese market.

PowerX stated that it intends to continue expanding battery storage infrastructure across Japan through its ongoing partnership with ITOCHU.

The Miyagi project adds to what both companies are positioning as a growing pipeline of grid-scale deployments in the country, as Japan works to integrate higher volumes of renewable generation into its regional power grids.

Role in Japan's Energy Storage Landscape

Japan's push to expand grid-scale battery storage capacity is closely tied to its broader renewable energy ambitions. The Tohoku region, where the Miyagi Shiroishi Battery Farm will be located, faces the same supply-demand balancing challenges that affect many areas of Japan as solar and wind generation increase their share of the electricity mix.

Battery storage systems play a direct role in absorbing surplus generation during periods of high renewable output and releasing it when demand rises or generation falls.

The selection of the Miyagi Shiroishi Battery Farm for a METI subsidy under the FY2025 program signals official recognition of the project's contribution to those policy goals.

The subsidy program is specifically designed to support battery storage projects that enable greater renewable energy adoption, aligning the facility's operational purpose directly with national energy policy objectives.

With commercial operations scheduled within fiscal year 2028, the project timeline places it within a period when Japan's grid operators are expected to be managing significantly higher levels of variable renewable generation than today.

The 23 MW power conversion system output and 75.2 MWh of storage capacity are scaled to provide meaningful flexibility services to the Tohoku-area grid once the facility comes online.

The investors behind the project company, Tokyu Land Corporation and IBeeT Corporation, bring real estate and energy development experience to the venture, reflecting the cross-sector nature of many grid-scale storage projects in Japan, where land development and energy infrastructure expertise are often combined to bring facilities from planning to operation.

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