STACK and Celsio celebrate the first year of successful heat reuse and take guests on a journey through the Ulven Energy Central and STACK's OSL01A data center.

The idea to feed heat from STACK’s OSL01A data center near the heart of Oslo into the city’s district heating system was first conceived in 2018. Over the following years, the concept was tested and proven, and a dedicated heat-exchange plant was built on STACK’s campus, where new insulated pipework and cooling coils were retrofitted to the data center.

The partnership creates a circular economy for energy and STACK’s OSL01A data center now exports around 3.5MW of heat energy into the Oslo district heating system, reducing Celsio’s alternative energy production by 25,000,000kWh (25GWh).

Low-maintenace Festuca grass thrives in summer heat. Hawthorn, Privet, Photinia, Red Robin, and Viburnum Tino trees and bushes are drought-resistant and naturally filter CO₂ emissions. Limestone pavement drains naturally and without releasing dust or pollutants.

Planting trees on and around our data center campuses helps offset CO₂ emissions and brings biodiversity to otherwise industrial areas

At STACK's MIL01 campus in Milan, we've planted a garden where our staff and clients can take a break and enjoy nature. In addition to offsetting our carbon footprint, the garden enhances the aesthetic of an industrial area and provides a local ecosystem for our campus bees. A system to collect and recycle rainwater within the garden irrigation system is under development.

In Zurich, STACK’s ZUR01A data center hosts a low-maintenance garden on the roof with plants and flowers attractive to local pollinators.

Honeybees are responsible for 80% of the world's pollination and protecting this endangered species is essential for biodiversity.

On our campuses in Milan, Stockholm and Oslo, STACK hosts several beehives. Each hive contains up to 60,000 bees and up to 6,000 bees are born daily. A single honeybee can visit up to 2,000 flowers a day and travels up to 3 km from its hive. 

STACK will soon host beehives at several more of its EMEA campuses, bringing essential pollinators to local crops across Europe.

Rainwater harvesting decreases dependence on the mains water supply, resulting in an overall reduction of water consumption. It also reduces the loads in local drainage systems and helps minimize localized storm flooding.

On the OSL03 and OSL04 campuses and in Geneva at STACK's GEN02A facility, underground tanks collect rainwater which is then filtered and reused as part of the data centers' cooling systems.

Renewables, sourcing, & waste

Across our facilities in Milan, Geneva, Oslo, and Stockholm, STACK provides more than 50 electric vehicle charging stations for staff and client use.

In Milan, covered parking structures at all sites and the roof of MIL02A host photovoltaic panels which produce supplemental energy for non-critical loads.

We've increased the sourcing of local materials and contractors across EMEA, reducing the carbon footprint of transportation to the site.

In Geneva, Zurich, and Stockholm, we recycle or donate decommissioned servers and other data center infrastructure and make the solutions available to clients.