References
The numbers that matter, on real buildings.
Every Cartesian project is monitored end-to-end. Here are the case studies, the metrics and the lessons we learned along the way.
Cutting peak demand at a Trondheim office
More than 100 000 NOK in annual savings — and a smaller grid connection.
Smart cold storage for an everyday supermarket
Lower energy consumption and a more resilient cold chain — without changing the recipe.
Storing solar energy in a zero-emission lab
A real-world testbed for the role of thermal storage in zero-emission buildings.
Recognition
Backed by accelerators, juries and the trade press.
Independent validation that the Cartesian playbook scales beyond Norway.
- 2025 · Climate cohort
Amazon Sustainability Accelerator
Selected for Amazon's 2025 climate cohort — 12 weeks of growth support and access to Amazon's European sustainability network.
- 2025 · Winner
Nordic Innovation Award
Inaugural winner of the Nordic Innovation Award, presented in Copenhagen by the Nordic patent authorities.
- 2025 · Nominee
ISH Frankfurt — Designplus
Nominated for the Designplus Award at ISH Frankfurt, the world's leading trade fair for energy and heating innovation.
Common questions
Got questions about thermal storage?
From PCM chemistry and lifetime to indoor vs outdoor installs and typical payback — the answers are in the full FAQ.
Read all questionsWhat is thermal energy storage?
The term is used when storing energy as heat or cold, which can be released at a later stage. The heat or cold is usually stored when energy is cheap and then released when the heating or cooling demand is at a peak or the cost of energy is high.
What is PCM?
PCM means Phase Change Material and refers to any material that changes state, for example from solid to liquid, when reaching a certain temperature. This phase change enables large amounts of energy to be absorbed or released. Water is one PCM, storing cold at zero degrees Celsius by changing phase to ice. Cartesian uses a wide variety of other materials, such as bio-based waxes, to store heat or cold at different temperatures.
Is the Thermal Box and the PCM flammable?
For applications with HVAC systems, Cartesian's Thermal Box is not considered flammable. While some PCM might be flammable when they reach temperatures above 100 °C or more, the Thermal Box is designed to eliminate any risks of reaching flammability conditions in operations.
Are PCMs safe?
Cartesian offers only safe PCMs and primarily uses bio-based PCMs in the Thermal Box. The PCM will stay in the Thermal Box for its whole lifetime and is not consumed during operation. The Thermal Box is also designed to avoid any risk of PCM leakage.
Let's build the smarter grid