Understand our Aalborg Project

Why this project?

An important step towards renewable and secure heat

Heating accounts for half of the world’s energy consumption, and the majority still comes from fossil fuels. This challenge calls for new solutions – a rethinking of how we produce heat.

That is exactly what we are doing with our project in Aalborg.

With this full-scale demonstration project, we are testing a new type of geothermal solution, Heat4Ever™, designed to deliver renewable, stable, and local district heating – without significant CO₂ emissions and without visible impact on the surroundings. If we succeed, we will have an alternative that can be scaled – in Aalborg, across Denmark, and internationally.

This project matters to all of us: For you, by providing access to renewable geothermal heat. For Denmark, by adding a new tool to the green transition. And for Green Therma, by taking a crucial step toward making sustainable geothermal heat available to everyone.

What are we doing?

How the project progresses – from site studies to renewable heat

At Green Therma, we approach the development of future heating solutions with great responsibility. Our demonstration project in Aalborg is a key step in expanding the use of renewable geothermal energy, and we want to keep you, as a neighbor, well informed along the way. Here is an overview of how we expect the project and its individual phases to unfold.

Mapping the underground
Before drilling begins, we conduct seismic surveys in the area around the drilling site. These surveys are harmless and involve no intervention in nature. They provide us with a precise picture of the subsurface and form a solid foundation for planning.
Establishing the drilling site
Once permits are secured, work begins to prepare the drilling site. This includes excavation as well as temporary installations for electricity, water, and sewage. The drilling equipment is then transported to the site and assembled under safe conditions.
Installing Aalborg’s new renewable heating solution

The drilling and installation phase lasts about three months, during which nearby residents may notice increased activity at the site. For us, it is important to give those affected the best possible experience. That’s why we strive to maintain close dialogue throughout the process.

We use safe, environmentally approved, and recognized drilling methods – the same type used when drilling for drinking water.

From drilling site to natural site

When drilling is completed, we remove the equipment and install a technical facility in a small building, about the size of a carport, adapted to the local surroundings. It is then connected to the district heating network. Finally, the area is restored, allowing nature to reclaim the space.

Heat with minimal impact
Once completed, the facility will deliver stable, secure, and renewable district heating to 800–1,200 households for at least 50 years – benefitting the local community. The facility will be unmanned, produce no noise, odors, or CO₂, and will require only minimal maintenance.

Frequently asked questions

Questions about the construction process:

Drilling the well takes about three months. The full construction period with site activity will last about six months.

We expect the facility to be completed in 2027.

Questions about the completed facility:

No. The main power consumer is a circulation pump with up to 50 kW capacity, compared to a heating output of up to 2 MW.

When completed, the facility will take up no more space than a 20-foot container, housed in a small building.

The facility is expected to provide up to 2 MW of heat. Aalborg Forsyning will distribute this within the overall energy supply.

Want to know more?

Any questions?

Contact project manager Mads Sylvest Eegholm at +45 51 49 22 04 eller e-mail mse@greentherma.com.

Want to meet us?

We are presenting our solution at industry events and conferences. Feel free to reach out, if you would like to meet up.