Kyoto Group Launches Thermal Energy Storage System in Hungary

Kyoto Group has unveiled a significant advancement in sustainable energy use with the launch of its thermal energy storage system at the KALL Ingredients corn processing plant in Tiszapüspöki, Hungary. Announced on 9 October 2023, this project marks the second deployment of Kyoto Group’s innovative Heatcube technology, which is designed to replace natural gas usage in industrial applications.

The 56MWh Heatcube system will provide over 30GWh of process heat annually to the facility, significantly reducing its reliance on fossil fuels and lowering carbon emissions. The Heatcube operates with a charging capacity ranging from 10-20MW and a discharge capacity of up to 14MW. This technology can store energy up to 104MWh and release steam at temperatures between 150 and 300 degrees Celsius.

Kyoto Group’s technology utilizes resistive heaters that convert electricity into heat, which is then stored in molten salt. This method ensures that energy can be released when required, providing a reliable source of industrial heat. The Heatcube is built for a lifespan exceeding 25 years and boasts a round-trip efficiency of over 93%, with a usable energy storage density of approximately 280kWh/m2.

Partnerships and Business Model

This project was made possible through collaborations with Kyoto Group’s majority investor, Kyotherm, and its energy trading partner, minority investor Energiabörze, a local trader and aggregator based in Hungary. KALL Ingredients has opted for a 15-year heat-as-a-service agreement, allowing the company to benefit from the Heatcube technology without the upfront costs of purchasing the system outright.

The Heatcube will also participate in flexibility markets, ensuring that it charges with renewable energy whenever available. This approach not only enhances the sustainability of KALL Ingredients’ operations but also aligns with broader efforts to decarbonize industrial processes.

Challenges and Market Landscape

Thermal energy storage technology is gaining traction as a viable solution for decarbonizing hard-to-abate emissions in industrial settings. Kyoto Group is one of several companies striving to commercialize these technologies. Nevertheless, the sector faces challenges, including maintaining high-quality, consistent heat at elevated temperatures and ensuring a seamless transition for end-users.

Kyoto Group’s first deployment occurred in Denmark earlier in 2023. Other notable players in this field include Israeli companies and American firms focusing on similar technologies, as well as Scandinavian providers like the Danish molten salt storage company. Additionally, Finnish companies are exploring lower temperature thermal storage solutions for domestic district heating, exemplified by their innovative ‘Sand Battery’ technology.

As industries worldwide seek sustainable alternatives to traditional fossil fuels, initiatives like the one launched by Kyoto Group could play a pivotal role in reshaping energy consumption in the industrial sector. The successful implementation of the Heatcube at KALL Ingredients may serve as a model for future projects across Europe and beyond.