HOBE ENERGY, a Next-Generation Battery Solution Provider, Implements In-House EMS at Grid-Scale Battery Storage Facilities; "Nanabongi Power Storage" (5MWh) Successfully Receives Power Following "Uenara Power Storage"

HOBE ENERGY Corporation (Headquarters: Minato-ku, Tokyo; President & CEO: Kyoichi Okino; hereinafter "HOBE ENERGY") is pleased to announce that on March 31, 2026, power reception was completed at the "Nanabongi Power Storage" facility, which Japan Energy Storage Development Organization, Inc. (Headquarters: Minato-ku, Tokyo; President: Akira Hoshino; hereinafter "JESDI"), a developer and promoter of grid-scale battery energy storage systems (BESS), has been advancing in Kamisato Town, Kodama District, Saitama Prefecture. This project follows the successful power reception at Uenara Power Storage (Kumagaya City, Saitama Prefecture, 5MWh) on March 27, 2026, marking a consecutive achievement for HOBE ENERGY and further solidifying its track record in deploying its proprietary grid-scale battery storage systems and EMS (Energy Management Systems).

Grid-Scale Battery Storage: Essential for the Renewable Energy Era, Expanding Role in Supporting Power Infrastructure With the increasing adoption of renewable energy, addressing output fluctuations caused by weather and time of day has become a critical challenge for Japan's power infrastructure. As the proportion of renewable energy rises, the development of grid-scale battery storage systems, capable of storing surplus electricity and discharging it when needed, is indispensable for maintaining the stability of the power grid. Furthermore, energy security is a significant national challenge for Japan, necessitating a shift away from an energy structure heavily reliant on imports, the establishment of a decentralized energy base, and the strengthening of power supply resilience.

Amidst this landscape, government support for the deep tech domain is also intensifying, leading to heightened expectations for battery and energy management technologies. Grid-scale battery storage systems are drawing attention as a foundational technology for next-generation power infrastructure, serving as an adjustment capability to support the widespread adoption of renewable energy. Against this backdrop of societal demand, HOBE ENERGY has established a system that provides integrated design, procurement, implementation, and operational support for battery storage systems, working towards the development of social infrastructure for the renewable energy era.

Significance for HOBE ENERGY: Accelerating the Deployment of Grid-Scale Battery Storage Systems Having established its first operational success with its proprietary grid-scale battery storage system at the Uenara Power Storage facility, HOBE ENERGY has quickly demonstrated its reproducibility with the power reception at Nanabongi Power Storage on the 31st of the same month. The consecutive achievement of planned power reception completion from commencement of construction across multiple projects underscores the robustness of the company's integrated system encompassing design, procurement, EMS implementation, and construction coordination. HOBE ENERGY, led by President & CEO Kyoichi Okino, an engineer with experience at Fuji Electric and ABB, has made the development and utilization of domestic technology and contribution to energy security core pillars of its management strategy, and this project represents a steady advancement of that strategy.

Installation Overview ・Power Storage Name: Nanabongi Power Storage ・Location: Kamisato Town, Kodama District, Saitama Prefecture ・Equipment Capacity: 5MWh (Output approx. 3MW) ・Power Reception Date: March 31, 2026 ・Battery Storage System: HOBE ENERGY proprietary 5ft compact battery storage system (LFP) ・EMS: HOBE ENERGY proprietary EMS (Supports Supply-Demand Adjustment Market, Real-time Control) ・Construction Partner: E-TOP Inc. ・Aggregator: RUTILEA Inc. ・Power Storage Development: Japan Energy Storage Development Organization, Inc. (JESDI)

From left: Mr. Shogo Iizuka (E-TOP Inc.), Mr. Akira Hoshino (Japan Energy Storage Development Organization, Inc.), Mr. Kyoichi Okino (HOBE ENERGY Corporation)

HOBE ENERGY's Technological Features The technological core of this power storage facility lies in the EMS (Energy Management System) developed in-house by HOBE ENERGY. It achieves real-time control not only for charging and discharging the batteries but also for responding to the supply-demand adjustment market and renewable energy output fluctuations. In collaboration with the aggregator RUTILEA, the system is designed with the premise of connecting to the supply-demand adjustment market.

Furthermore, HOBE ENERGY's 5ft container battery units are easier to transport and install compared to the industry-standard 20ft container type, with a structure that can accommodate narrow access routes and locations with sharp curves. This enables the realization of grid-scale battery storage models that are resilient to site constraints, such as substation grounds or former factory sites, which were previously difficult to utilize. The consecutive achievement of planned power reception completion from commencement of construction at Uenara and Nanabongi has once again demonstrated the reproducibility of a process that enables early market entry.

Future Business Development HOBE ENERGY plans to expand the "one-stop solution for grid-scale battery storage" established through the Uenara and Nanabongi projects to other suitable locations for renewable energy and areas requiring power grid reinforcement within Japan. With the goal of achieving a renewable energy ratio of 40-50% by fiscal year 2040, as outlined in the government's 7th Strategic Energy Plan, the demand for battery storage infrastructure essential for grid stabilization is expected to expand rapidly. As a specialized company capable of providing integrated battery system design, procurement, EMS implementation, and market connection support, HOBE ENERGY is positioning itself to capture this national policy demand.

Moreover, the company aims to become a comprehensive battery solution provider capable of offering optimal solutions tailored to application, scale, and cost requirements, not only for lithium-ion batteries but also for next-generation battery technologies such as sodium-ion batteries and redox flow batteries.

Comments from Kyoichi Okino, President & CEO, HOBE ENERGY Corporation "The completion of power reception at Nanabongi Power Storage, following Uenara Power Storage, is a significant milestone for us, further solidifying our track record in deploying grid-scale battery storage systems. I would like to express my sincere gratitude to President Hoshino of JESDI, E-TOP Inc. for their construction work, and RUTILEA Inc. for their operational support. Achieving power reception for two projects consecutively within March demonstrates the effectiveness of our integrated system encompassing design, manufacturing, EMS implementation, and construction coordination in actual projects. Moving forward, through integrated solutions combining batteries and EMS, we will continue to contribute to the widespread adoption of renewable energy and the advancement of power infrastructure, promoting the development of foundational systems for Japan's energy independence."

Comments from Akira Hoshino, President, Japan Energy Storage Development Organization, Inc. "The power reception at Nanabongi Power Storage, achieved in a short period following Uenara Power Storage, is a testament to the results of our collaborative efforts with all related companies to advance multiple projects. I deeply appreciate the cooperation of everyone involved, including E-TOP Inc. for construction, RUTILEA Inc. for operational support, and HOBE ENERGY Corporation for equipment supply. JESDI will continue to steadily complete each project, enhance its reproducibility, and accumulate achievements nationwide as a developer of power storage facilities that combines both speed and reliability." Japan Energy Storage Development Organization, Inc.: https://japan-energystorage.co.jp/

Comments from Shogo Iizuka, President, E-TOP Inc. "It is a great honor to have completed the construction of Nanabongi Power Storage as EPC, managing the schedule and quality with safety as the top priority, and achieving completion as planned. For this project, we carried out construction based on the characteristics of HOBE ENERGY's 5ft compact battery storage system, establishing the foundation for the integrated setup of batteries, EMS, PCS, and substation equipment, and for operation in the primary regulation capacity of the supply-demand adjustment 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 Corporation, to contribute to the expansion of power storage infrastructure nationwide and the adjustment of power supply and demand balance." E-TOP Inc.: https://etop-co.com/

Comments 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 power storage facilities being developed by Japan Energy Storage Development Organization, Inc. Following our entry into the supply-demand adjustment market (primary regulation capacity) approximately two months after power reception at the Aisho Town Power Storage facility in Shiga Prefecture, we will contribute to the stabilization of power supply and the maximization of power storage facility value through early entry into the supply-demand adjustment market and advanced market operation using AI in future projects, including Nanabongi Power Storage, thereby contributing to the realization of Japan's decarbonized society." RUTILEA Inc.: https://www.rutilea.com

Company Overview 【HOBE ENERGY Corporation】 ・Company Name: HOBE ENERGY Corporation ・Representative: Kyoichi Okino, President & CEO ・Head Office Location: 3F, Toyei Nishishinbashi Bldg., 1-13-5 Nishishinbashi, Minato-ku, Tokyo 105-0003 ・Business Activities: Specialized battery business (small-scale, industrial, sodium-ion batteries, EMS) ・URL: https://hobeenergy.co.jp/

【Japan Energy Storage Development Organization, Inc. (JESDI)】 ・Company Name: Japan Energy Storage Development Organization, Inc. ・Representative: Akira Hoshino, President ・Business Activities: Development and promotion of grid-scale battery energy storage systems (BESS) ・URL: https://japan-energystorage.co.jp/