The Green Hydrogen Plant – The Future of Energy

The Green Hydrogen Plant

The Kireina Suiso plant in Iizakamachi-Nakano, Fukushima-shi, is designed to represent the next energy revolution. The plant generates green hydrogen using a proprietary technology called Dual-TCE™ (Thermo-Chemical Electrolysis).

Green hydrogen will be highly demanded by a vast market landscape looking for more ecologically friendly power sources. Apart from the combined cycle power plant's infrastructure, the existing energy distribution network will still be in use. When it comes to producing hydrogen and delivering it to the market, we focus on cost efficiency. Furthermore, the plant's performance will be improved over time by ensuring increasingly competitive results.

Kireina Suiso


Iizakamachi Nakano, Fukushima, 960-0261, Japan.

Total installed capacity
75 solar MW + 15 electrolysis MW + 15 MWh storage

Jobs created
Up to 400 employees

Over 100 million USD




Izakamachi-Nakano is a town in Fukushima Shi (Fukushima-ken) about 153 miles (or 246 kilometers) north of Tokyo. We started building the region's largest plant producing green hydrogen for industrial usage several years ago. The plant now includes a 75 MW photovoltaic solar plant, a 15 MWh lithium-ion battery system, and one of the world's largest electrolytic hydrogen production systems (15 MW). Everything is composed of fully renewable resources.

At our facility, hydrogen is produced in a hydrogen production unit that uses the electricity provided by a solar power generation unit and the grid. The hydrogen is then stored for later use in a variety of applications. The entire process is CO2-free, from manufacturing to use. The goal is to create a hydrogen supply system that is environmentally beneficial.

We control hydrogen production and storage based on demand projections from the hydrogen demand and supply forecasting system and modify the amount of hydrogen produced by the hydrogen production unit to keep the power grid demand and supply balanced. The system also makes optimum use of the electricity generated by the solar power-producing unit, which is made from renewable energy. The system control technology, which optimizes three factors—hydrogen generation and storage, power grid supply-demand changes, and the utilization of electricity obtained from renewable energy—is at the heart of this project. The green hydrogen produced here is transportable and can be used for a variety of industrial applications. With a production capacity of more than 150,000 t/year, this plant is already one of the most efficient in the area.



The hydrogen plant was built at Iizakamachi-Nakano, a prime location with an important industrial hub. Furthermore, the initiative will contribute to the advancement of green hydrogen's technological maturity, making it a viable option for effective decarbonization in the medium term.




The solar plant (75 MW) has several innovations:

  • The installation includes bifacial panels, which have two light-sensitive surfaces and longer usable life, allowing for increased production.
  • The plant uses cluster inverters or string inverters, which increase yield and allow for more efficient use of the surface area.
  • The project includes a storage system that makes plant management easier. The battery system will have a storage capacity of 15 MWh and a power output of 3.8 MW.