Liquid Loops & Urban Warmth: The Next Frontier in Data Center Efficiency - CleanTechnica

The article from CleanTechnica highlights the significant opportunity to improve data center efficiency by capturing and repurposing the vast amounts of heat they generate. Traditionally, data centers have treated heat as a waste product, using energy-intensive air cooling systems that consume 20–40% of their power just to maintain safe operating temperatures. However, with the rise of hyperscale data centers and AI workloads, there is growing interest in transforming this heat from a liability into a valuable resource. Liquid cooling technologies, such as direct-to-chip and immersion cooling, enable servers to operate at higher outlet temperatures (50–60 °C), making the waste heat suitable for integration with modern district heating networks. This approach is already being implemented in northern Europe, where dense district heating infrastructure allows data centers to supply thermal energy to residential heating demands. Examples include Meta’s data center in Odense, Denmark, which provides about 100,000 MWh annually to the local grid, and Microsoft’s Azure facilities in Finland, delivering 250