Norwegian startup Kyoto Group has developed a groundbreaking technology for storing thermal energy called Heatcube, originally intended to support sustainable practices in the tea industry in rural Africa. The company’s primary objective was to reduce the need for land to grow wood for drying tea leaves. “We were searching for a simple and affordable solution: a mini-station powered by concentrated solar energy,” stated Tim de Haas, the group’s commercial director.
Recognizing the effectiveness and potential of Heatcube in heat storage, the startup shifted its focus to maximizing this capability. The device utilizes excess electricity from any source, including the electric grid, solar, and wind energy, to store energy in three types of molten salts housed in modular tanks. These salts can reach temperatures ranging from 170 to 500 degrees Celsius.
A key advantage lies in the low solidification temperature of the salts, enabling the use of less expensive materials for tank production and expanding the customer base. Heatcube can generate heat in the form of steam, hot air, or thermal oil, making it suitable for various applications ranging from cooking to the steel and cement industries.
This innovative technology can charge and discharge for over 25 years, primarily using renewable energy sources and emitting no carbon dioxide. Heatcube stands out for its durability, affordability, efficiency, and environmentally friendly nature.
The supply of thermal energy is becoming an appealing alternative to fossil fuels. For instance, a startup backed by Bill Gates has substituted molten salt with liquid tin, while another company utilizes sulfur, which boasts a higher energy density than molten salt.
Germany and Spain are identified as the main markets for Kyoto Group, where there is a significant demand for industrial heat. “Currently, the industry heavily relies on gas for heat generation. Our primary aim is to replace industrial gas boilers, aiding in the reduction of CO2 emissions by switching to renewable energy sources that are available 24/7,” mentioned de Haas.