This new technology, referred to as a "thermal box," operates as a cold battery, storing energy when electricity prices are low and using it when prices are high. This solution is set to benefit the store's energy expenses, the environment, and the overall electricity grid.

The thermal box concept addresses the fluctuations in electricity prices caused by varying demand and supply, particularly from renewable sources like wind and solar power. Typically, electricity prices peak when demand is high and drop significantly when there is a surplus of production. By storing cold energy during periods of low electricity prices and using it during peak times, REMA 1000 aims to reduce its own energy bills and to contribute to flattening the peaks in electricity demand for society at large.

The underlying technology was initially developed by SINTEF through the FME HighEFF research centre. HighEFF, or the Centre for an Energy Efficient and Competitive Industry for the Future, focuses on improving energy efficiency across various industrial sectors. Their research and development efforts have now been furthered by Cartesian, a company that has taken on the task of commercialising the technology.

Petter Røkke, Research Director at SINTEF Energy Research and leader of FME HighEFF, highlighted the importance of this development: "The ability to store and manage energy effectively is crucial for both cost savings and environmental sustainability. By reducing the strain on the electricity grid during peak hours, technologies like the thermal box not only save money but also contribute to a more balanced and resilient energy system."

Learn more

• Watch NRK's news story about the official launch of the thermal box (in Norwegian).
• Read NRK's article about the launch of the thermal box (in Norwegian).