Green Mountain
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Green Mountain is a Norwegian wholesale and retail colocation provider best known for building data centers inside a former NATO mountain bunker and running its sites almost entirely on hydropower and free cooling. As of 2025 it operates four data center campuses in Norway (Rennesøy near Stavanger, Rjukan in Telemark, Enebakk near Oslo, and Hamar), one in the UK (Romford, East London), and is completing a fourth international site in Mainz, Germany, via a joint venture with energy firm KMW. Its Hamar campus is a dedicated single-tenant build for TikTok under the company’s ‘Project Clover’ European data-storage initiative, and is described by Green Mountain as Norway’s largest data center campus. Founded in 2009 and majority-owned by Israel’s Azrieli Group since a 2021 acquisition reported at roughly $850 million, Green Mountain differentiates itself through extreme energy efficiency (PUEs around 1.2), fjord- and river-based free cooling, and a pan-European expansion strategy built around renewable power access rather than proximity to a single metro.
Green Mountain has a confirmed data center presence at the following locations:
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Green Mountain Data Center Locations
- Mainz, Rhineland-Palatinate, Germany FRA-Mainz PENDING REVIEW
The campus is a 50/50 joint venture with German energy firm KMW that will feed surplus waste heat via heat pumps into Mainz's district heating network, reportedly serving up to 20,000 households as well as Mainz Cathedral and a local stadium. - Enebakk, Norway OSL-Enebakk · +47 468 80 863 PENDING REVIEW
The campus's original building is dedicated to a single unnamed international cloud provider, while later buildings on the site were built as multi-tenant colocation halls. - Hamar, Norway OSL-Hamar PENDING REVIEW
The campus is a dedicated single-tenant build for TikTok under its 'Project Clover' initiative to store European user data within the EU, and its construction created 220 permanent local jobs. - Rennesøy, Norway SVG-Rennesøy (DC1-Stavanger) TIER III CARRIER-NEUTRAL · +47 469 03 139 PENDING REVIEW
The facility was converted from a former high-security NATO ammunition storage complex carved into a mountain and was among the first Nordic colocation data centers to achieve Uptime Institute Tier III certification. - Rjukan, Norway TEL-Rjukan (DC2-Telemark) TIER III · +47 948 61 119 PENDING REVIEW
The site sits at the bottom of a steep valley that receives no direct sunlight for six months of the year, giving it roughly 330 days of free natural-air cooling annually. - Romford, UK LON-East (LON1-East)AI DATA CENTER PENDING REVIEW
This was Green Mountain's first facility outside Norway, acquired from Infinity Data Centres/SDC in 2022 and rebranded, and it sits close enough to London's financial district and stock exchange data centers to serve low-latency trading customers.
By Continent
Green Mountain AI Data Centers
Green Mountain's clearest AI-specific infrastructure is at its LON-East facility in Romford, UK, which the company markets directly for AI and HPC workloads. According to Green Mountain's own site, the facility offers advanced air and liquid cooling with racks supporting densities above 100kW, aimed at hyperscale and enterprise AI customers. Separately, Green Mountain announced in 2024 that it would host Hewlett Packard Enterprise's AI and HPC infrastructure at two of its Norwegian facilities, though the specific buildings involved were not disclosed at the time.
- Romford, UK LON-East (LON1-East) AI DATA CENTER PENDING REVIEW
This was Green Mountain's first facility outside Norway, acquired from Infinity Data Centres/SDC in 2022 and rebranded, and it sits close enough to London's financial district and stock exchange data centers to serve low-latency trading customers.
Common Questions
Does Green Mountain offer AI or GPU-optimized data center space?
Yes — its LON-East facility in Romford, UK is specifically marketed for AI, cloud, and HPC workloads and is described by the company as offering advanced air and liquid cooling with racks supporting 100kW+ densities for HPC and AI use.
Where are Green Mountain's data centers located?
The company operates data centers in Rennesøy (near Stavanger), Rjukan (Telemark), Enebakk (near Oslo), and Hamar in Norway, plus Romford in the UK, with an additional campus under construction in Mainz, Germany.
What is distinctive about Green Mountain's Rennesøy data center?
SVG-Rennesøy is built inside a former high-security NATO ammunition storage facility carved into a mountain and was one of the first Nordic colocation facilities to achieve Uptime Institute Tier III certification.
Who is the main tenant at Green Mountain's Hamar campus?
OSL-Hamar is a single-tenant campus built for TikTok as part of its 'Project Clover' effort to store European user data within the EU, with an initial 90MW across three buildings and an option to expand to 150MW.
Does Green Mountain offer colocation services?
Yes — we've identified 6 facilities where Green Mountain may offer colocation services. Please contact Green Mountain directly to confirm current availability and terms.
Does Green Mountain offer cloud services?
We haven't confirmed cloud services for Green Mountain yet — this isn't a definitive no, since our research can miss things. Please contact Green Mountain directly to confirm cloud availability.
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