Responsibility for environment

CSC is a pioneer in the sustainable development of ICT services and committed to promoting climate targets in all of its operations. CSC’s aim is to minimize the environmental impacts caused by its activities. Supporting the green transition not only means reducing the carbon footprint, but also achieving positive green growth in terms of climate impact.

Energy efficient data centers

        CSC's data centers in Kajaani offer world-class energy efficiency.  By international comparison, the energy efficiency of the data centers in Kajaani is good or extremely good, and continued efforts are being made to improve it further. The key to energy efficiency is that all the energy consumed by the data centers is spent on meaningful activities and that the waste heat generated by them is used sustainably. The usage rate of the computing servers CSC offers to Finnish research is high, and our methods for ensuring efficient use of resources include scaling tests. Read more: CSC's modern data center environment.

CSC's EuroHPC data center was completed on schedule in spring 2021. Stage 1 installations of the supercomputer LUMI were launched in summer 2021, and the piloting of the system’s first phase started in October 2021.  As the first phase of the supercomputer LUMI was only up and running in autumn 2021, its annual energy efficiency can only be verified based on measurements made in 2022. The use of waste heat generated by LUMI and the district heating production capacity were tested with good results in the pilot phase. The district heating production will reach its full capacity in 2022. At that time, the waste heat will cover 20% of the annual demand for district heating in Kajaani with zero carbon dioxide emissions. All electricity used by LUMI is generated with renewable hydropower. Read more:  LUMI supercomputer and EuroHPC data center.

Thanks to an advanced cooling solution implemented for the supercomputer Mahti, the energy efficiency of Kajaani data center remained at a good level in 2021. In 2021, the PUE figure measuring Mahti's energy efficiency was 1.08, which is very good. The PUE value measuring the energy efficiency of the modular data center (MDC1) commissioned in Kajaani in 2012 was 1.03, which is one of the best in the world. A steady increase in the usage rate of the modular data center (MDC2) commissioned in 2014 has slightly improved its PUE value, which was 1.18 in 2021. In Espoo, the slightly lower usage rate and exceptionally warm summer reduced the energy efficiency of Pohja data center compared to the previous year. The PUE value of Pohja data center was 1.66 in 2021.

CSC's data center energy consumption in 2013–2021



CSC's data center energy efficiency in 2013–2021



Energy and water


CSC's Espoo and Kajaani offices accounted for about 2% of CSC's total electricity consumption in 2021. The electricity consumption of the data centers in Espoo and Kajaani represented the highest environmental load created by the company. All electricity used by CSC’s data centers and offices in 2021 was generated with renewable hydropower.

CSC is not a major consumer of water. CSC's data centers mainly use a closed water cooling cycle, which minimizes their water consumption. In free-cooling data center modules, water is mainly used for humidity control and emergency cooling.

Environmental responsibility in other operations

Most CSC employees worked remotely during the second year of turmoil created by the COVID-19 pandemic, and travel remained very limited.

In 2021, CSC prepared for the lifting of the recommendation to work remotely by renting 664 m² of additional space for its Espoo premises at the Life Science Center to meet the needs of increasing employee numbers and more frequent video conferences. The aim is to make the new leases as flexible as possible, and in space use, the goal is at adaptability and environmentally friendly solutions. The visitor center associated with the LUMI data center opened its doors in Kajaani, but few group visits went ahead while the pandemic was still widespread.

CSC continued the Digital Workplace -project on digital and multilocational work, in which a new remote work model was launched. As remote work becomes more common, climate-friendly solutions can be achieved at the individual level, which will also have a positive impact on the environmental load of CSC's premises over a longer period of time.

Environmental risks

Potential environmental risks associated with the data centers are managed in compliance with current regulations. No environmental damage was reported in 2021.

The greatest environmental risks associated with CSC's operations relate to the handling of the gas mixtures, refrigerants and generator fuel oils used in the data center infrastructure, and the disposal of decommissioned equipment. Under the data center maintenance contracts, the suppliers have an obligation to ensure that hazardous substances and materials are disposed of appropriately. Whenever possible, refrigerants and gas extinguishers are recycled and reused during maintenance or repairs.

In our procurement, CSC adheres to the polices of the Hansel framework agreement, which also addresses environmental concerns. The company’s procurement policy also instructs employees to examine environmental factors at all stages of a procurement from planning to use and decommissioning.

The decommissioning of hardware is already provided for in the procurement contracts. Depending on these contracts, hardware may be returned to the manufacturer or recycled separately when so agreed.

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