How a Danish engineering firm captures waste heat from data center cooling

As the rapid growth of artificial intelligence compounds global energy strains, engineers in Denmark have found a practical way to capture the vast amounts of thermal exhaust generated by data center operations. There are currently more than 12,500 data facilities worldwide, consuming hundreds of billions of litres of water and placing massive demands on electrical grids. The International Energy Agency reported that these facilities used 485 terawatt-hours of electricity in 2024, a figure projected to double by 2030.

At the University of Southern Denmark, the Bitten supercomputer generates extreme thermal energy around the clock. Instead of venting this energy into the atmosphere, a new liquid cooling system designed by Danfoss pumps coolant over processing chips to absorb 100 percent of the waste heat. This thermal output is then channelled directly into Sonderborg's municipal district heating network to warm local homes.

Capturing data center thermal exhaust offers a vital source of renewable energy for municipal heating systems.

Kristian Strand of Danfoss Climate Solutions noted that the process creates a reliable source of hot water that can heat homes and support industrial processes. While countries like the United States host thousands of facilities that draw heavy electricity loads, Scandinavia continues to lead in capturing thermal exhaust. Meta's facility in Odense and Stockholm's municipal integration demonstrate how recapturing thermal energy can reduce reliance on fossil fuels.

Why it matters

The expansion of artificial intelligence infrastructure poses a growing threat to electricity systems worldwide while contributing significantly to global warming. By capturing thermal exhaust and redirecting it into municipal networks, engineers have demonstrated a scalable method to turn an environmental challenge into a sustainable utility.

This technology offers a practical way to lower fossil fuel reliance and reduce heating bills, transforming industrial energy waste into a valuable resource for communities.