Swiss data center firm Green has begun construction work on two data centers at its campus in Zurich.

The company this week announced building work on data centers N and O has commenced on the Metro-Campus Zurich in Dielsdorf. The two new facilities will offer a combined 35MW and provide room for around 4,000 racks across 11,600 sqm (124,860 sqm).

Green Zurich swiss data center N and O

Originally announced in January 2021, the Zurich Metro campus will eventually span three buildings (M, N, and O) on a 46,000 sqm (495,150 sq ft) site. Construction on the the first data center – M – began in early 2021 and officially went into operation in January 2023.

“Our growth reflects the rapid technology and digitalization push,” said Roger Süess, CEO of Green. “Modern data centers are needed to ensure that this transformation can be realized in Switzerland quickly, securely, and sustainably.

Waste heat from the data centers will be used by Energie 360°. Construction on a heating center and district heating network in Dielsdorf is underway.

The first district heating center will be opened in the Metro-Campus area in 2024 and will supply up to 3,500 households in Dielsdorf.

“We’re doing our bit for the circular economy and supporting the energy transition through the use of waste heat as well as a number of other measures. We are convinced that future-oriented digitalization can only be achieved through sustainable data centers,” said Süess.

Green operates three other locations around the Zurich area. Zurich West will also build out to three facilities across 10,000 sqm (107,650 sq ft); Zurich City is an underground facility the company acquired in 2016 offering 3,200 sqm (34,450 sq ft), and Zurich North is a two-story facility spanning 1,000 sqm (10,750 sq ft).

Green is owned by InfraVia Capital Partners, which acquired the company from Altice in 2017 for around $217 million.

Last year Green completed a $514 million refinancing. The company said at the time it would use the money to ‘accelerate its development strategy’ and to fund the next phase of growth.