Saitama Prefecture's Kamisato Town Receives 5MWh Grid-Scale Battery "Shichihongi Storage Facility," Accelerating Storage Infrastructure Development with Consecutive March Commissionings Following Kamina-Sato Storage Facility

Japan Energy Storage Development Organization Inc. (Headquarters: Tokyo, Representative Director: Akira Hoshino, hereinafter "JESDI"), which promotes the social implementation of grid-scale battery energy storage systems (BESS), announced that it has completed receiving power at the "Shichihongi Storage Facility" developed in Kamisato Town, Kodama District, Saitama Prefecture, on March 31, 2026.

■ Installation Overview and Technical Features

This storage facility has a capacity of 5MWh for an output of 2MW and will play a role in providing "primary regulation capacity" to maintain the frequency of the power grid.

While industry-standard 20ft containers are common, this facility utilizes HOBE ENERGY's 5ft compact storage system. This allows for installation even in locations with narrow access routes or sharp curves, significantly increasing the flexibility in site selection and serving as an implementation model that accommodates land constraints. Furthermore, receiving power was achieved in approximately 3.5 months from the start of construction, indicating progress in standardizing the design and construction process to shorten the lead time to market entry.

Storage Facility Name	Shichihongi Storage Facility
Location	Kamisato Town, Kodama District, Saitama Prefecture
Equipment Capacity	5MWh (Output 2MW)
Power Receiving Date	March 31, 2026
Construction Start Date	December 15, 2025
Construction Partner	E-TOP Co., Ltd.
Operation Support	RUTILEA Inc.
Main Components	HOBE ENERGY 5ft compact storage system (LFP), EMS, PCS, and integrated substation transformer container
Battery Supplier	HOBE ENERGY Inc.

■ Track Record of Early Market Entry

This project follows the Kamina-Sato Storage Facility, which received power on March 27, 2026. JESDI has established a system capable of concurrently advancing multiple projects in a short period, culminating in actual power reception achievements.

Based on its experience of power reception and market entry in Shiga Prefecture (2025), JESDI will inherit this successful model for the Shichihongi Storage Facility, aiming for early operation and profitability.

■ Future Outlook: Continuous Expansion of Storage Facilities

Building on its achievements in Shiga and Saitama, JESDI will accelerate the installation of grid-scale batteries across Japan. Notably, the consecutive power reception of the Shichihongi Storage Facility following the Kamina-Sato Storage Facility signifies the establishment of a development system that can handle multiple projects concurrently, from site selection, design, construction, grid connection, to market entry preparations, rather than just individual project handling.

Moving forward, by pooling the strengths of each company – including HOBE ENERGY's 5ft compact storage system, RUTILEA's operational support, and E-TOP's construction capabilities – JESDI will continue to build storage facilities, thereby advancing the creation of next-generation infrastructure that supports the expansion of renewable energy adoption and the stabilization of the power grid.

■ Comment from Akira Hoshino, Representative Director, Japan Energy Storage Development Organization Inc.

The power reception at the Shichihongi Storage Facility, achieved in a short period following the Kamina-Sato Storage Facility, is a testament to the results of our efforts in promoting multiple projects in unison with our partner companies. I express my deepest gratitude to E-TOP, who handled the construction, RUTILEA, who supports operations, HOBE ENERGY, who supplied the equipment, and all others who cooperated. JESDI will continue to reliably complete each project, enhance its reproducibility, and accumulate achievements nationwide as a developer that offers both speed and reliability in storage facility development.

■ Comment from Kyoichi Okino, Representative Director, HOBE ENERGY Inc.

We are extremely pleased to celebrate the power reception of the Shichihongi Storage Facility. This project, one of the parallel projects following the Kamina-Sato Storage Facility, provided an opportunity for HOBE ENERGY to demonstrate its stable supply system capable of handling multiple projects as a proven track record.

As the grid-scale battery market expands, we believe that not only the performance of the equipment but also the system's ability to reliably supply it at the required time is a crucial foundation for project advancement. Through the provision of our 5ft compact storage system, we have supported solutions that are adaptable to site constraints and facilitate short-term implementation.

Moving forward, HOBE ENERGY will further enhance its product competitiveness, stable supply capabilities, and project responsiveness, contributing to the development of storage infrastructure nationwide alongside partner companies like JESDI.

■ Comment from Takahiro Yasutomi, Senior Project Leader, RUTILEA Inc.

RUTILEA Inc. operates AI service and AI infrastructure businesses with the mission of "Making AI easy. Realizing a society where AI is introduced into all business processes." Utilizing the power trading optimization AI cultivated in-house, we participate as an aggregator in the storage facilities being developed by Japan Energy Storage Development Organization Inc.

Following our entry into the balancing market (primary regulation capacity) approximately two months after power reception at the storage facility in Aisho Town, Shiga Prefecture, we will contribute to the stabilization of power supply and the maximization of storage facility value through early entry into the balancing market and advanced market operations using AI for future projects, including the Shichihongi Storage Facility, thereby contributing to the realization of Japan's decarbonized society.

■ Comment from Shogo Iizuka, Representative Director, E-TOP Co., Ltd.

We are greatly honored to have completed the construction of the Shichihongi Storage Facility as EPC, prioritizing safety and managing schedule and quality centrally, as planned.

In this project, we performed construction considering the characteristics of HOBE ENERGY's 5ft compact storage system, establishing the foundation for the integrated setup of the battery, EMS, PCS, and substation equipment, and for operation in the primary regulation capacity of the balancing market.

We will continue to work closely with the client, Japan Energy Storage Development Organization Inc., the aggregator, RUTILEA Inc., and the battery manufacturer, HOBE ENERGY Inc., to contribute to the expansion of storage infrastructure nationwide and the adjustment of power supply and demand balance.

End

■ Inquiries Regarding This Matter

Japan Energy Storage Development Organization Inc.
Inquiry Form: https://japan-energystorage.co.jp/contact/

■ Company Profile

Company Name: Japan Energy Storage Development Organization Inc.
Established: October 2024
Representative Director: Akira Hoshino
Location: 2-12-4-303 Kita-Aoyama, Minato-ku, Tokyo 107-0061
Capital: 10 million yen
TEL: 03-6899-2733
Business Activities: Design, construction, operation, maintenance, management, technology development, and sales of storage facilities, and businesses related to power supply.
URL: https://japan-energystorage.co.jp

■ Partner Companies

HOBE ENERGY Inc. https://hobeenergy.co.jp/
RUTILEA Inc. https://www.rutilea.com/
E-TOP Co., Ltd. https://etop-co.com/