ReGACY Investee and First-Year Takehara DX Program Participant Blossom Energy Succeeds in Commercializing Japan's First Thermal Storage Boiler
Blossom Energy has commenced operation of its commercial thermal storage boiler "Blossom Energy G-TES" in Takehara City, Hiroshima Prefecture. This marks Japan's first successful commercialization of a graphite-based thermal storage boiler, representing a significant step towards decarbonization in the industrial heat sector.
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- 📰 Published: May 1, 2026 at 02:00
- 🔍 Collected: April 30, 2026 at 17:32
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Blossom Energy Inc. (Headquarters: Chiyoda-ku, Tokyo; CEO: Shinpei Hamamoto), an investee of ReGACY Innovation Group Inc. (Headquarters: Chiyoda-ku, Tokyo; President & CEO: Koichi Naruse; hereinafter "ReGACY") and a company selected for the first year of the Takehara City Accelerator Program "Takehara DX," has completed the installation of the first unit of its commercial thermal storage boiler "Blossom Energy G-TES" in Takehara City, Hiroshima Prefecture, and commenced operation in April.
This initiative is Japan's first successful case of commercializing a graphite-based thermal storage boiler, marking a significant step towards decarbonization in Japan's industrial heat sector.
A results briefing session was held on Tuesday, December 23, 2025, attended by the Vice Mayor of Takehara City, Hiroshima Prefecture officials, and representatives from the implementing companies. The achievements of regional and startup collaboration in connecting new industrial technology to social implementation were shared.
Furthermore, on Tuesday, March 31, 2026, the supply of hot water from the installed commercial unit to the hot water storage tank began.
Significance of this project's commercialization
This project serves as an important use case that will trigger a transformation in the regional industrial structure, starting with the advanced technology of a startup.
Industrial heat energy accounts for approximately 40% of Japan's primary energy demand, much of which still relies on fossil fuels. Blossom Energy's heat storage technology is a technology that contributes to the decarbonization and energy independence of regional industries by storing and supplying renewable energy and unused energy as "heat."
With the commercialization progressing in Takehara City, concrete examples of how advanced startup technology can lead to regional industrial promotion are being presented as follows:
- Solving challenges in local industries
- Potential for new local industries centered on technology
- A model case that can be expanded to other municipalities
Furthermore, the introduction of the thermal storage boiler is expected to have the following effects at the implementation site:
- Reduction of CO₂ emissions and energy costs by utilizing surplus renewable energy
- Increased efficiency in providing services at hot spring facilities
ReGACY: Designing and promoting co-creation that connects industry, academia, government, and regions
In this project, ReGACY has been involved not only in accelerator management but also as a designer and promoter of co-creation, connecting local governments, regional businesses, prefectures, central government agencies, and educational institutions (colleges of technology) across various sectors.
ReGACY will continue to provide comprehensive support, including management assistance, business development, and finance, to startups and research seeds that bring new value to Japan, until their commercialization.
About Blossom Energy
Blossom Energy is a deep tech startup founded in April 2022, with a mission to "greenify steam worldwide and reduce greenhouse gas emissions by 10%." Led by Shinpei Hamamoto, who spent 20 years researching and developing research reactors at the Japan Atomic Energy Agency (JAEA), the company is promoting the development of high-temperature gas reactors that generate "heat" more cheaply and safely, and the development of thermal energy storage systems inspired by that technology.
[Blossom Energy Company Profile]
Company Name: Blossom Energy Inc.
Representative: Shinpei Hamamoto, Representative Director
Location: 12 KANDA 403, 2-3-12 Kanda Suda-cho, Chiyoda-ku, Tokyo 101-0041
URL: https://www.blossom-energy.biz/
Business Activities: Design, manufacturing, and sales of equipment used for power generation, etc.
About Takehara DX
"Takehara DX" is an accelerator program aimed at creating innovations that serve as model cases for solving regional issues, through collaboration between venture and startup companies with strong technologies and ideas, and various players facing challenges within Takehara City.
To embody a "sustainable town that shines in the Seto Inland Sea," Takehara City, which is undertaking "challenging" and "advanced" projects as a local government, and ReGACY and LIA, which have a track record and know-how in holding accelerator programs with various local governments and large corporations, aim to promote economic and industrial development through local innovation by leveraging their respective strengths.
About ReGACY Innovation Group Inc.
Established in February 2022, ReGACY develops and deploys services specializing in venture creation and business commercialization through open innovation from major corporations, local governments, and educational institutions. By integrating management consulting and venture capital methods, ReGACY can provide comprehensive co-creation support from exploration to commercialization and monetization, offering integrated innovation services to legacy organizations.
This initiative is Japan's first successful case of commercializing a graphite-based thermal storage boiler, marking a significant step towards decarbonization in Japan's industrial heat sector.
A results briefing session was held on Tuesday, December 23, 2025, attended by the Vice Mayor of Takehara City, Hiroshima Prefecture officials, and representatives from the implementing companies. The achievements of regional and startup collaboration in connecting new industrial technology to social implementation were shared.
Furthermore, on Tuesday, March 31, 2026, the supply of hot water from the installed commercial unit to the hot water storage tank began.
Significance of this project's commercialization
This project serves as an important use case that will trigger a transformation in the regional industrial structure, starting with the advanced technology of a startup.
Industrial heat energy accounts for approximately 40% of Japan's primary energy demand, much of which still relies on fossil fuels. Blossom Energy's heat storage technology is a technology that contributes to the decarbonization and energy independence of regional industries by storing and supplying renewable energy and unused energy as "heat."
With the commercialization progressing in Takehara City, concrete examples of how advanced startup technology can lead to regional industrial promotion are being presented as follows:
- Solving challenges in local industries
- Potential for new local industries centered on technology
- A model case that can be expanded to other municipalities
Furthermore, the introduction of the thermal storage boiler is expected to have the following effects at the implementation site:
- Reduction of CO₂ emissions and energy costs by utilizing surplus renewable energy
- Increased efficiency in providing services at hot spring facilities
ReGACY: Designing and promoting co-creation that connects industry, academia, government, and regions
In this project, ReGACY has been involved not only in accelerator management but also as a designer and promoter of co-creation, connecting local governments, regional businesses, prefectures, central government agencies, and educational institutions (colleges of technology) across various sectors.
ReGACY will continue to provide comprehensive support, including management assistance, business development, and finance, to startups and research seeds that bring new value to Japan, until their commercialization.
About Blossom Energy
Blossom Energy is a deep tech startup founded in April 2022, with a mission to "greenify steam worldwide and reduce greenhouse gas emissions by 10%." Led by Shinpei Hamamoto, who spent 20 years researching and developing research reactors at the Japan Atomic Energy Agency (JAEA), the company is promoting the development of high-temperature gas reactors that generate "heat" more cheaply and safely, and the development of thermal energy storage systems inspired by that technology.
[Blossom Energy Company Profile]
Company Name: Blossom Energy Inc.
Representative: Shinpei Hamamoto, Representative Director
Location: 12 KANDA 403, 2-3-12 Kanda Suda-cho, Chiyoda-ku, Tokyo 101-0041
URL: https://www.blossom-energy.biz/
Business Activities: Design, manufacturing, and sales of equipment used for power generation, etc.
About Takehara DX
"Takehara DX" is an accelerator program aimed at creating innovations that serve as model cases for solving regional issues, through collaboration between venture and startup companies with strong technologies and ideas, and various players facing challenges within Takehara City.
To embody a "sustainable town that shines in the Seto Inland Sea," Takehara City, which is undertaking "challenging" and "advanced" projects as a local government, and ReGACY and LIA, which have a track record and know-how in holding accelerator programs with various local governments and large corporations, aim to promote economic and industrial development through local innovation by leveraging their respective strengths.
About ReGACY Innovation Group Inc.
Established in February 2022, ReGACY develops and deploys services specializing in venture creation and business commercialization through open innovation from major corporations, local governments, and educational institutions. By integrating management consulting and venture capital methods, ReGACY can provide comprehensive co-creation support from exploration to commercialization and monetization, offering integrated innovation services to legacy organizations.