Aerial view of Cartesian ThermaBox storing thermal energy

Front page

Flexibility for the energy transition

Cartesian unlocks the power of thermal energy storage to help the world’s most energy-intensive sectors to boost energy efficiency and rapidly reduce their carbon footprint.

Learn more
Aerial view of Cartesian ThermaBox storing thermal energy

Our technology

We provide modular and cost-effective energy storage systems for large heating and cooling systems. Cartesian’s solutions help you optimise your energy usage to balance your grid capacity and save surplus energy for later use.

Our systems are based on 10 years of research and development on thermal energy storage at SINTEF – one of Europe’s largest independent research organisations.

Flexible and scalable

Modular, flexible
and based on phase-change materials

Modular design to allow scaling for every use-case

Concept based on 10+ years
of R&D
at SINTEF

Wide temperature range
(from -40°C to 120 °C) for the technology architecture, simply by adapting the PCM material

Robust, with lifetime expectancy of minimum 25 years

Applications


Our Story

Cartesian is a spin-out from SINTEF Energy Research. The company is owned by its four founders and SINTEF Venture.

Our thermal energy storage technology has been developed at SINTEF in collaboration with industry partners through a series of research and demo projects in 2017-2022, including FME HighEFFPCM-STORE and PCM-STOVE

Our first 200-kWh demo at NTNU/SINTEF’s Zero Emission Building in Trondheim has been in operation for about two years with successful results. Our second pilot (combined to CO2 cooling in a supermarket) will be put in operation in Q4-2023. More pilots – to demonstrate various use cases – are on their way. 

The backstory

Our story is all about complementarity. On the one hand, Alexis Sevault focused his research at SINTEF Energy Research on developing a compact heat storage technology to help decarbonise both buildings and industry processes. 

On the other hand, Håkon Selvnes focused his PhD at NTNU onto finding a compact solution to store cold energy for the largest and most energy-efficient food processing factory in Norway, which Arne Fredrik Lånke was helping design.  

After several years of development, publishing and proving the concept, they both met when it came to demonstrating their findings into actual prototypes. That’s when they figured out that they could use the exact same technology design for both cold and heat storage. 

They later met Asle Jostein Hovda at SINTEF TTO who guided them through the path of commercialisation and introduced them to Frode Iglebæk, a seasoned CEO with extensive experience in business development and commercialization of research-based technology. 

All together they founded Cartesian AS in 2023 to push the technology to its final aim of decarbonising buildings and industry processes and realise its full potential.

The ZEB laboratory operated by NTNU and SINTEF in Trondheim. Energy from the laboratory’s solar panels is stored as heat in a so-called bio-battery. This energy is then used to heat the building when the weather is cold and the sun isn’t shining.
The ZEB laboratory operated by NTNU and SINTEF in Trondheim. Energy from the laboratory’s solar panels is stored as heat in a so-called bio-battery. This energy is then used to heat the building when the weather is cold and the sun isn’t shining. Photo: SINTEF

Interested in learning more about our technology?

See the live data from our demo 200-kWh PCM-based heat storage at the ZEB-laboratory.

Contact us

Håkon Selvnes

Chief Project Officer

Hakon.Selvnes@cartesian.no
+47 470 96 502

Mathias Kristensen

Engineer

 Mathias.Kristensen@cartesian.no

Headquarters: Trondheim, Norway

info@cartesian.no

Visiting address

Cartesian AS
Tempevegen 22
7031 Trondheim
Norway
Tel: +47 905 09 782

Registered business address

Cartesian AS
Tempevegen 22
7031 Trondheim
Norway
Enterprise no: 830 975 012 

INVOICE INFORMATION

EHF: Our preferred way of receiving invoices is on the EHF-format. Cartesian is listed in the Norwegian ELMA register, which enables automatic processing of incoming invoices. 

E-mail/PDF: Electronic invoices can be sent to  invoice@cartesian.no

  • The e-mail must contain only one invoice (one file). 
  • The email cannot contain a link to an invoice
  • The attachment must be in PDF or TIF format, limited to 2MB
  • Please note that any text in the e-mail will not be read by a person. Do not use the text field to send messages or notifications.

Invoice on paper 

Cartesian AS
Tempevegen 22
7031 Trondheim