propmodo
Summary
Most people think of data centers as buildings. They are, technically, but they are more usefully understood as heat machines. Every computation generates heat. Every server rack in a modern AI data center generates heat at a density that would have been considered extraordinary just a few years ago.
Cooling already accounts for about 40% of total data center energy use, which means that improving thermal management is one of the highest-leverage levers available for reducing both operating costs and environmental impact.
Germany’s new Energy Efficiency Act requires that starting July 2026, new data centers must prove they are utilizing at least 10% of their generated waste heat, rising to 15% in 2027 and 20% in 2028. Scandinavia is further along. Finland, Sweden, Denmark, and Norway already routinely integrate data center waste heat into district heating networks, with Stockholm’s district energy operator actively connecting excess heat producers into its network. The real-world results are meaningful. An Amazon Web Services data center in Tallaght, Ireland, provides recycled heat free of charge to a scheme initially planned to heat 55,000 square meters of public buildings, commercial space, and 133 apartments.
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