Adven is drilling for renewable geothermal energy for Viggby Ängar
In Täby, just outside Stockholm, Adven is drilling 300 metres into the bedrock to supply renewable geothermal heating and cooling to the new housing estate Viggby Ängar. Work to construct a climate friendly, cost-effective energy solution for Aros Bostad’s new homes is now in full swing.
Ground was broken for the new housing estate Viggby Ängar during the spring and shortly afterwards Adven began work on building the plant that will deliver geothermal energy to the property. One of the two main elements of the project, the drilling itself, was performed during the summer.
Renewable geothermal heating and cooling supplied from 300 metres underground
A total of 11 holes were bored to a depth of 300 metres in Viggbyholm, where the new homes will be built. The boreholes, each of which is approximately 10 centimetres in diameter, were then filled with pipes that will efficiently transport heating and cooling from the bedrock to the energy central using the medium of an ethanol-based fluid. At the central, the geoenergy will be refined before distributed to all homes in the estate.
The geothermal solution was designed by Sebastian Zetterström, who will also be project managing the work on site. Sebastian explains that the drilling operation was performed simultaneously with piling to stabilise the buildings’ foundations. This places high demands on coordination between the various stakeholders involved in the project.
“Meticulous planning and continuous dialogue with all involved is key. We attend all site meetings so that we can be more proactive and work together more efficiently,” he says.
The benefits of geothermal energy for greenfield projects
Maria Barrio is Senior Sales Manager for real estate energy at Adven. She highlights cost-effectiveness as one of the major benefits of the geothermal solution chosen for Viggby Ängar.
“This is an entirely new housing estate located some way from existing infrastructure. It is therefore advantageous if we can extract energy on site, rather than using district heating with limitations from a purely infrastructure standpoint,” explains Maria.
Sebastian Zetterström also points out that the fact that Viggby Ängar is a new build means that the solution offers more efficient use of space compared to a retrofitted plant for an existing property.
“On a greenfield project such as this, there are no existing cables or other installations to adapt to, which makes the work faster and more straightforward. We can also use land in a better way and drill where the property later will be built, which wouldn’t have been possible in a retrofit,” Sebastian explains.
Energy central next
With the completion of piling and boring, building work can begin in earnest.
For Adven’s part, the next stage will be the construction of the energy central. This work can commence when at least three floors of the building are completed, estimated to be in early 2022, but preparatory work began in the summer with excavation and laying pipes that will connect with the plant room.