Cartesian has developed a thermal box that stores excess heat and cold. This solution allows users to distribute their energy usage throughout the day, reducing both energy consumption and CO₂ emissions in commercial buildings.
The company builds on research from SINTEF and NTNU, and the technology has been partially developed through the research center HighEFF. Following technology transfer from SINTEF TTO and further funding from multiple investors, the company is now establishing itself in the European market. It already operates installations in Norway and France and plans further expansion in Europe and the USA.
One of these installations is at REMA 1000 in Mjøndalen, Norway. Here, the thermal battery stores energy when electricity prices are lowest, relieving the grid during periods of high demand. Experiences from this installation demonstrate how the technology contributes to lower energy costs and reduced climate impact in the grocery industry.
“Cartesian demonstrates what is achievable when research and industry collaborate on concrete challenges. This technology provides a new and efficient way of storing energy, making the energy system more flexible and robust. These are exactly the types of solutions we need for a successful energy transition,” says Petter Røkke, research director at SINTEF Energy.
About the solution:
The Thermal Box is charged with heat or cold when energy supply is abundant and electricity prices are low. The stored energy is released during the daytime when heating or cooling demands are greatest and electricity prices are higher. This reduces energy consumption by 10%, energy costs by 20%, peak load demands by at least 30%, and investments in cooling and heating equipment. The technology contributes to lower CO₂ emissions through more efficient energy use. Additionally, it reduces the need for new grid expansions, allowing more users access to energy within existing infrastructure. The materials used are 100% sustainable and recyclable.
