Heat recovery from atNorth's SWE04 data centre to the Långsele district heating network
atNorth is building a 300 MW data centre in Långsele, Sollefteå municipality. Calentix is developing a heat recovery plant that would supply recovered heat to the Långsele district heating network, and in a potential second phase to the larger system in Sollefteå. Both networks are operated by the utility Adven.
- Partner
- atNorth (SWE04)
- Location
- Långsele, Sollefteå municipality
- Calentix role
- Project developer
- Stage (Nov 2026)
- Commercial negotiations (stage 5 of 8)
Planned data centre capacity at the site
Heat recovered in the first phase, with potential for expansion
New pipelines to the district heating networks
Target for first heat delivery
The opportunity
SWE04 is atNorth's third site in Sweden. The data centre is expected to be operational in 2028, and recoverable heat becomes available as operation ramps up. Two district heating networks, both operated by the utility Adven, could potentially be connected to the data centre: Långsele lies about 2 km from the site, and Sollefteå about 10 km from the data centre.
What we found
Our feasibility study, completed in April 2026, examined heat recovery from atNorth's SWE04 facility under two production scenarios, and compared three possible offtakes: the Långsele network, the larger network in Sollefteå, and a possible future heat user at the planned Hamre Industrial Park.
Heat recovery is feasible. The cooling temperatures at the data centre suit large heat pumps, and the study found no regulatory or environmental obstacles. The local district heating operator and the municipality were positive in the consultations. The commercial picture differs between the cases. Långsele, about 2 km away, is close to viable on the modelled assumptions. The remaining gap depends on commercial structuring and the potential for regional investment support. Sollefteå, about 10 km away, requires a considerably larger investment, dominated by the transit pipeline, which no single party is expected to be able to carry without substantial public support, though coordinating the trench with other planned groundworks would materially change that picture. Any heat reuse in the Hamre Industrial Park depends on demand materialising and is not part of the current plan.
What Calentix does here
Calentix and atNorth have signed a project development agreement covering Långsele. Under it, we lead the technical, commercial and financial development of the heat recovery solution.
Our aim is to take the project to an investment decision and then own and operate the recovery plant as an independent heat producer.
The first connection is 1.6 MW against a data centre of 300 MW. Further capacity and customers, for example at a future industrial park nearby or expanding to the Sollefteå network, could be added later once the first phase of the plant and pipeline exist.
Where the project stood in November 2026
- 1
Pre-feasibility check
Completed
- 2
Feasibility study
Completed. Recovery to Långsele confirmed technically feasible and showed commercial potential.
- 3
Business potential assessment
Completed. Close to viable at short distance, with a small remaining gap to be addressed through heat price, regional support or contributions from project parties.
- 4
Partner alignment
Project development agreement signed with atNorth.
- 5
Commercial and technical framework
Heat price, land access, grid connection terms and co-funding under negotiation through 2026.
- 6
Heat Purchase Agreement
Targeted for 2027.
- 7
Investment decision and financing
Follows the heat purchase agreement and detailed engineering.
- 8
Construction and operation
Construction from 2028; heat delivery from 2029.
Planning a site of your own?
We assess new sites against the same criteria and can give an early view on whether heat recovery looks realistic.
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