Norwegian data center operator Green Mountain and German power company KMW have topped out a data center in Mainz, outside Frankfurt, Germany.

Located on Ingelheimer Aue, next to the KMW power plants, the 25,000 sqm (269,095 sq ft) data center will offer 18MW of capacity.

At full build-out, the campus will offer 54MW across three buildings, though further details of the other facilities have not been shared.

The campus will be fully powered by renewable energy and provide up to 60MW of heat for 20,000 households.

Green Mountain and KMW partnered in a joint venture at the beginning of 2023 for the project, with construction beginning in October of the same year.

“With green electricity, Rhine water cooling, district heating utilization, and a PUE value below 1.3, we are creating a data center here that is both sustainably and technologically pioneering,” said Oliver Malerius, CEO of KMW.

Svein Atle Hagaseth, CEO of Green Mountain, added: “Our FRA-Mainz project sets a new standard for sustainable data centers – not only in Germany, but worldwide. This project shows how we can create a greener digital future through partnerships and innovative technologies. This is a milestone we can all be proud of.”

Green Mountain was founded in 2009. Israeli real estate firm Azrieli Group acquired Green Mountain from Norwegian real estate firm Smedvig for $850 million in 2021.

It operates three sites across Norway in Oslo, Rjukan, and Rennesøy.

Further campuses are planned in Kalberg, Gismarvik, Undheim, and Hønefoss. The company has signed a 90MW hosting deal with TikTok at its OSL2-Hamar site and a 10MW deal with a cloud provider in Oslo.

While the company primarily operates in Norway, it acquired a data center outside London in Romford, UK, in 2022.

Officially founded in 1931 with roots back to the late 1800s, KMW has invested in around 10 wind farms, two solar farms, a wind-to-hydrogen plant, a CHP plant, a biogas plant, a 330MW peaking plant, a district heating storage tank, and several power plants.

Frankfurt has long been an established data center market, with the likes of Digital Realty, CyrusOne, Iron Mountain, NTT, Global Switch, Telehouse, Colt, Cogent, Data4, Vantage, EdgeConneX, Lumen, and Equinix all having a presence in the city.