Power Base -

GW Scale Battery

Assembly Plant in Japan

Redefine manufacturing

and power the future

Create the future of energy at Japan’s most celebrated art destination

Located in southern Okayama Prefecture, Tamano City neighbors the shores of the Seto Inland Sea and is blessed by the mild climate and lush natural scenery. Once home to the largest shipbuilding yards in Japan, Tamano City is relatively protected from earthquakes and other natural disasters. Its main port, Uno Port, is the major gateway to Setouchi Islands as well as a venue for the international art festival, Setouchi Triennale.

Hello, Tamano City !

An idyllic port city that was once home to Japan’s shipbuilding industry

To accelerate the shift to renewable energy, PowerX is committed to delivering energy storage solutions, a quintessential part of the new power infrastructure, as well as creating a symbiosis between nature and industry. We envision Power Base as the starting point of a sustainable, tech-driven future, and we look forward to building that future with the people of Tamano City.

5GW battery assembly plant in Japan

Pilot production starts in 2023 
and product delivery by Spring 2024

Power Base is PowerX's first ground-up battery production site in Japan with 5GWh of annual capacity. With a pilot production scheduled in 2023 and product delivery in early 2024, Power Base, featuring automated production lines and cutting-edge research laboratories, will set new standards for manufacturing.

Made-in-Japan, high performance, low cost

Factory of the future

A place that connects people 
and inspires ideas to shape the future

Power Base is a factory like no other - its architectural design is driven by both functionality and innovation to promote communication, creativity, and co-creation. The whole complex is canopied by one undulating roof that melds with the topography and surrounding community, creating a space that is welcoming and engaging.

Green manufacturing

Sustainable production that minimizes environmental impacts
while conserving natural resources

With a mission to accelerate the transition to a decarbonized future, we are committed to building an eco-friendly factory that coexists with the natural environment and local communities, as well as producing energy storage solutions that enable a greener future.


Kazuyo Sejima

Architect. In 1987, Kazuyo Sejima opened her own studio in Tokyo. In 1995, she founded SANAA with Ryue Nishizawa. Sejima was appointed director of the 12th International Architecture Exhibition of Venice Biennale in 2010. Her honors include the Japan Architecture Award, Venice Biennale Golden Lion Award, Pritzker Architecture Prize, Officier de l’Ordre des Arts et des Letters, and the Medal with Purple Ribbon. SANAA’s main works include the 21st Century Museum of Contemporary Art in Kanazawa, the Rolex Learning Center (Ecole Polytechnique Federale de Lausanne), and Louvre-Lens.

Photo: Kohei Omachi


Location Tamano City,
Okayama Prefecture
Access 1 hour from Okayama Airport, 5 minutes from Uno Station
Site area 28,272㎡
Production capacity 5Gwh per year
Facilities ESS production line, office,

research & development

centers, gallery, etc.
Project partners Kazuyo Sejima & Associates, Okumura Corporation, etc.