Segments
One thermal battery, every kind of building.
Each segment has a different load profile, set-point and risk tolerance. Cartesian configures the Thermal Box, hydraulics and controls to match — out of the box.
Where we deliver
Built for the buildings that run the world.
From hyperscale data centres to neighbourhood heat networks — wherever heating or cooling matters, Cartesian unlocks flexibility.
Commercial and public buildings
Cut peak loads and energy bills across offices, retail, schools, hospitals and other public buildings.
Data centres
Maximize the revenue within your limited grid connection.
Logistics centres and warehouses
Protect the cold chain and add cooling headroom on peak days — without waiting for a bigger grid connection.
District heating or cooling
Defer pipe upgrades, integrate waste heat, balance grids at the edge.
Energy Service Companies
Invest in a thermal energy asset that provides consistent savings over 25 years.
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