Danish utility partners with technology provider for geothermal Heat4Ever project
Signing of collaboration agreement between Aalborg Forsyning and Green Therma (source: Green Therma)
Carlo Cariaga
31 Jan 2025
Danish utility Aalborg Forsyning has partnered with Green Therma for the Heat4Ever project, delivering geothermal heating using single-well technology.
Danish utility company Aalborg Forsyning has partnered with innovative technology company Green Therma to establish the first Heat4Ever project, which will use Green Therma’s patented DualVac technology for geothermal heat extraction. The project is expected to begin in 2025 with completion in 2027, although the prospective location is still being investigated.
Heat4Ever is a closed-loop system using the DualVac technology in which water circulates within the well and exchanges its heat with the district heating. This means that the heat extraction is done without the same geological limitations (e.g. the demand for quality and temperature of the geological formation water as well as permeability and porosity) of conventional geothermal facilities. The technology is further distinguishable in that it needs just one well, and the solution’s expected longevity is significantly longer.
The plan is for Aalborg Forsyning to receive the extracted heat, whilst Green Therma invests, establishes, and drives the plant. The demonstration plant has an estimated capacity of around 2 MW. This is only a small part of Aalborg Forsyning’s energy needs, but the project’s purpose will be primarily to test the solution and explore whether the new technology can be part of Denmark’s future district heating.
To complete the project, Green Therma collaborates with some of the world’s leading companies within drilling, well completion, and installation of surface facilities. These partners – alongside Green Therma’s technology and Aalborg Forsyning’s wish to implement green solutions for district heating – provide optimal conditions for a successful outcome. Funding for the project is expected to come from a combination of public support and investment from Green Therma.
Søren Gais Kjeldsen, managing director of Aalborg Forsyning, says: “Aalborg Forsyning is working hard on the green transition of our district heating production, and we want to also actively take responsibility for society’s green transition by contributing to the testing, development, and implementation of green technologies. The collaboration with Green Therma comes naturally because we get to test and demonstrate their geothermal plant which represents a more environmentally friendly employment of the earth’s heat.”
Jørgen Peter Rasmussen, CEO of Green Therma, adds: “We are happy to perform Heat4Ever together with Aalborg Forsyning as part of their goal to find green solutions to use for the production of district heating. Our solution is very promising, and it represents a major opportunity for district heating companies and others – nationally and globally – who aim to have renewable energy production from the core of the earth without CO2 emissions.”
Source: Green Therma
