5MWh Grid-Scale Battery Storage 'Nanbongi Power Storage Station' Receives Power in Kamisato, Saitama; Accelerating Infrastructure Development with Consecutive March Power-On Following Kaminara Station
Japan Energy Storage Development Institute (JESDI) has successfully energized its 5MWh 'Nanbongi Power Storage Station' in Saitama Prefecture. This follows the recent energization of the Kaminara station, demonstrating the company's ability to scale grid-scale battery infrastructure rapidly through standardized processes and compact 5ft battery systems.
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- 📰 Published: April 1, 2026 at 00:00
- 🔍 Collected: April 1, 2026 at 01:06 (1h 6m after Published)
- 🤖 AI Analyzed: June 2, 2026 at 13:02 (1499h 55m after Collected)
Japan Energy Storage Development Institute Co., Ltd. (Headquarters: Tokyo; Representative Director: Akira Hoshino; hereinafter "JESDI"), which promotes the social implementation of Battery Energy Storage Systems (BESS), completed power reception at the "Nanbongi Power Storage Station," which it had been developing in Kamisato-machi, Kodama-gun, Saitama Prefecture, on March 31, 2026.
■ Installation Overview and Technical Features
This power storage station secures a capacity of 5MWh against an output of 2MW and serves as a "primary adjustment power source" to maintain the frequency of the power grid.
While the industry standard is dominated by 20ft containers, this station adopts a 5ft compact energy storage system manufactured by HOBE ENERGY. This is a site-constraint-responsive implementation model that significantly increases the flexibility of candidate site selection, as it can be installed in locations with narrow access routes or sharp curves. Furthermore, power reception was achieved in a short period of approximately three and a half months from the start of construction, reflecting progress in the standardization of design and construction processes to shorten lead times to market entry.
[Table Data]
Station Name: Nanbongi Power Storage Station
Location: Kamisato-machi, Kodama-gun, Saitama Prefecture
Facility Capacity: 5MWh (Output 2MW)
Power Reception Date: March 31, 2026
Construction Start Date: December 15, 2025
Construction Partner: E-Top Co., Ltd.
Operational Support: RUTILEA, Inc.
Main Configuration: HOBE ENERGY 5ft compact energy storage system (LFP), EMS, PCS, and integrated step-up transformer substation container
Battery Supplier: HOBE ENERGY Co., Ltd.
■ Track Record of Early Market Entry
This project follows the Kaminara Power Storage Station, which received power on March 27, 2026, and marks the realization of JESDI's established system for simultaneously promoting multiple projects in a short period, resulting in actual power reception achievements.
Building on its track record of power reception and market entry in Shiga Prefecture (2025), JESDI will carry over this successful model to the Nanbongi Power Storage Station to advance early operation and monetization.
■ Future Outlook: Continuous Expansion of Power Storage Stations
Based on its achievements in Shiga and Saitama, JESDI will accelerate the installation of grid-scale battery storage across the country. In particular, the short-term power reception of the Nanbongi station following the Kaminara station demonstrates that the company has established a promotion system capable of advancing not only individual project responses but also site selection, design, construction, grid connection, and market entry preparations in parallel for multiple projects.
Moving forward, by consolidating the strengths of each company—the HOBE ENERGY 5ft compact storage system, operational support from RUTILEA, and the construction capabilities of E-Top—and continuously launching power storage stations, JESDI will proceed with building next-generation infrastructure that supports the expansion of renewable energy and the stabilization of the power grid.
■ Comment from Akira Hoshino, Representative Director, Japan Energy Storage Development Institute Co., Ltd.
The power reception at the Nanbongi Power Storage Station was achieved in a short period following the Kaminara station, and I view this as the result of our efforts to promote multiple projects in unison with our partner companies. I would like to express my deep gratitude to everyone who cooperated, including E-Top for handling construction, RUTILEA for supporting operations, and HOBE ENERGY for supplying the equipment. We will continue to build our track record nationwide as an operator equipped with both speed and reliability in power storage station development, increasing reproducibility while completing each project with certainty.
■ Comment from Kyoichi Okino, Representative Director, HOBE ENERGY Co., Ltd.
I am very pleased that we have reached the power reception of the Nanbongi Power Storage Station. This project is one of the parallel projects following the Kaminara station, and it served as an opportunity for HOBE ENERGY to demonstrate our stable supply system capable of handling multiple projects.
As the grid-scale battery market expands, I believe that not only equipment performance but also the system itself—the ability to supply reliably when needed—becomes an important foundation for project promotion. Through the provision of our 5ft compact storage systems, we have supported solutions that are easy to adapt to site constraints and lead to short-term implementation.
Going forward, HOBE ENERGY will continue to contribute to the development of power storage infrastructure across the country together with partner companies like JESDI by further enhancing our stable supply capacity and project response capabilities in addition to our product competitiveness.
■ Comment from Takahiro Yasutomi, Senior Project Leader, RUTILEA, Inc.
RUTILEA, Inc. develops AI service and AI infrastructure businesses with the mission of "Making AI easy. Realizing a society where AI is introduced into all business processes." We are participating as an aggregator in the power storage stations being developed by JESDI, utilizing the power trading optimization AI we have cultivated in-house.
Following our entry into the supply-demand adjustment market (primary adjustment power) within approximately two months of power reception at the Aisho-cho Power Storage Station in Shiga Prefecture, we will contribute to the stabilization of power supply and the maximization of the value of power storage stations in future projects, including the Nanbongi station, through early entry into the supply-demand adjustment market and the sophistication of market operations using AI, thereby contributing to the realization of a decarbonized society in Japan.
■ Comment from Shogo Iizuka, Representative Director, E-Top Co., Ltd.
In constructing the Nanbongi Power Storage Station, I am very honored to have completed the project as planned by managing the schedule and quality in an integrated manner with safety as our top priority as the EPC.
In this project, we carried out construction based on the characteristics of the HOBE ENERGY 5ft compact storage system, launched the integrated configuration of batteries, EMS, PCS, and substation equipment, and established the foundation for starting operations in the primary adjustment power segment of the supply-demand adjustment market.
We will continue to work closely with the project owner, Japan Energy Storage Development Institute Co., Ltd., the aggregator, RUTILEA, Inc., and the battery manufacturer, HOBE ENERGY Co., Ltd., to contribute to the expansion of power storage infrastructure and the adjustment of power supply and demand balance nationwide.
■ Installation Overview and Technical Features
This power storage station secures a capacity of 5MWh against an output of 2MW and serves as a "primary adjustment power source" to maintain the frequency of the power grid.
While the industry standard is dominated by 20ft containers, this station adopts a 5ft compact energy storage system manufactured by HOBE ENERGY. This is a site-constraint-responsive implementation model that significantly increases the flexibility of candidate site selection, as it can be installed in locations with narrow access routes or sharp curves. Furthermore, power reception was achieved in a short period of approximately three and a half months from the start of construction, reflecting progress in the standardization of design and construction processes to shorten lead times to market entry.
[Table Data]
Station Name: Nanbongi Power Storage Station
Location: Kamisato-machi, Kodama-gun, Saitama Prefecture
Facility Capacity: 5MWh (Output 2MW)
Power Reception Date: March 31, 2026
Construction Start Date: December 15, 2025
Construction Partner: E-Top Co., Ltd.
Operational Support: RUTILEA, Inc.
Main Configuration: HOBE ENERGY 5ft compact energy storage system (LFP), EMS, PCS, and integrated step-up transformer substation container
Battery Supplier: HOBE ENERGY Co., Ltd.
■ Track Record of Early Market Entry
This project follows the Kaminara Power Storage Station, which received power on March 27, 2026, and marks the realization of JESDI's established system for simultaneously promoting multiple projects in a short period, resulting in actual power reception achievements.
Building on its track record of power reception and market entry in Shiga Prefecture (2025), JESDI will carry over this successful model to the Nanbongi Power Storage Station to advance early operation and monetization.
■ Future Outlook: Continuous Expansion of Power Storage Stations
Based on its achievements in Shiga and Saitama, JESDI will accelerate the installation of grid-scale battery storage across the country. In particular, the short-term power reception of the Nanbongi station following the Kaminara station demonstrates that the company has established a promotion system capable of advancing not only individual project responses but also site selection, design, construction, grid connection, and market entry preparations in parallel for multiple projects.
Moving forward, by consolidating the strengths of each company—the HOBE ENERGY 5ft compact storage system, operational support from RUTILEA, and the construction capabilities of E-Top—and continuously launching power storage stations, JESDI will proceed with building next-generation infrastructure that supports the expansion of renewable energy and the stabilization of the power grid.
■ Comment from Akira Hoshino, Representative Director, Japan Energy Storage Development Institute Co., Ltd.
The power reception at the Nanbongi Power Storage Station was achieved in a short period following the Kaminara station, and I view this as the result of our efforts to promote multiple projects in unison with our partner companies. I would like to express my deep gratitude to everyone who cooperated, including E-Top for handling construction, RUTILEA for supporting operations, and HOBE ENERGY for supplying the equipment. We will continue to build our track record nationwide as an operator equipped with both speed and reliability in power storage station development, increasing reproducibility while completing each project with certainty.
■ Comment from Kyoichi Okino, Representative Director, HOBE ENERGY Co., Ltd.
I am very pleased that we have reached the power reception of the Nanbongi Power Storage Station. This project is one of the parallel projects following the Kaminara station, and it served as an opportunity for HOBE ENERGY to demonstrate our stable supply system capable of handling multiple projects.
As the grid-scale battery market expands, I believe that not only equipment performance but also the system itself—the ability to supply reliably when needed—becomes an important foundation for project promotion. Through the provision of our 5ft compact storage systems, we have supported solutions that are easy to adapt to site constraints and lead to short-term implementation.
Going forward, HOBE ENERGY will continue to contribute to the development of power storage infrastructure across the country together with partner companies like JESDI by further enhancing our stable supply capacity and project response capabilities in addition to our product competitiveness.
■ Comment from Takahiro Yasutomi, Senior Project Leader, RUTILEA, Inc.
RUTILEA, Inc. develops AI service and AI infrastructure businesses with the mission of "Making AI easy. Realizing a society where AI is introduced into all business processes." We are participating as an aggregator in the power storage stations being developed by JESDI, utilizing the power trading optimization AI we have cultivated in-house.
Following our entry into the supply-demand adjustment market (primary adjustment power) within approximately two months of power reception at the Aisho-cho Power Storage Station in Shiga Prefecture, we will contribute to the stabilization of power supply and the maximization of the value of power storage stations in future projects, including the Nanbongi station, through early entry into the supply-demand adjustment market and the sophistication of market operations using AI, thereby contributing to the realization of a decarbonized society in Japan.
■ Comment from Shogo Iizuka, Representative Director, E-Top Co., Ltd.
In constructing the Nanbongi Power Storage Station, I am very honored to have completed the project as planned by managing the schedule and quality in an integrated manner with safety as our top priority as the EPC.
In this project, we carried out construction based on the characteristics of the HOBE ENERGY 5ft compact storage system, launched the integrated configuration of batteries, EMS, PCS, and substation equipment, and established the foundation for starting operations in the primary adjustment power segment of the supply-demand adjustment market.
We will continue to work closely with the project owner, Japan Energy Storage Development Institute Co., Ltd., the aggregator, RUTILEA, Inc., and the battery manufacturer, HOBE ENERGY Co., Ltd., to contribute to the expansion of power storage infrastructure and the adjustment of power supply and demand balance nationwide.