Energy

Germany's New Data Centres Must Reuse Their Heat

Since 1 July 2026 every newly commissioned German data centre must run at PUE 1.2 or better and reuse at least 10 percent of its waste heat, rising to 20 percent by 2028. A site with no nearby heat buyer is now hard to permit, whatever the land costs. Here is what changes for operators.

EnergyBy Servola Tech Desk2026-07-083 min read

AI-assisted, edited by humans. | Editor-in-Chief: Leon Soliman | Editorial standards

Germany's New Data Centres Must Reuse Their Heat

Key takeaways

Since 1 July 2026 every newly commissioned data centre in Germany must run at a PUE of 1.2 or better and reuse at least 10 percent of its waste heat, rising to 20 percent by 2028, which means a site with no nearby buyer for that heat is now hard to permit no matter how cheap the land or the power.
The rules come from the Energy Efficiency Act and stack up: waste-heat reuse of 10 percent now, 15 percent from 2027 and 20 percent from 2028; existing centres must reach PUE 1.5 by 2027 and 1.3 by 2030; 100 percent renewable electricity from 2027; and a certified energy-management system since January 2026 for private sites above 1 MW and public ones above 300 kW.
Treat heat offtake as a siting input, not an afterthought: before you sign for land, confirm a district-heating network, greenhouse cluster or industrial neighbour that will actually take the heat, and model the reuse cost into the pro forma, because the cheap remote plot that cannot shed its heat may no longer be buildable.

What flipped on 1 July

The trigger was a date. From 1 July 2026, any data centre newly put into operation in Germany must be built and run to a PUE of 1.2 or better and to an Energy Reuse Factor of at least 10 percent, the share of its total energy that leaves the building for productive use elsewhere. That reuse threshold climbs to 15 percent for centres starting in 2027 and 20 percent for those starting in 2028.

The requirements do not stop at new builds. Existing centres commissioned before that date must hit a PUE of 1.5 by July 2027 and 1.3 by 2030, every covered site above 300 kW must source 100 percent renewable electricity from 2027, and since January 2026 private centres above 1 MW and public ones above 300 kW must run a certified energy or environmental management system. The reuse figure is measured under DIN EN 50600-4-6, so it is audited, not self-declared.

Why heat offtake is now a siting decision

Reusing 10 percent of your heat sounds modest until you ask who takes it. A data centre produces low-grade warm water, and that only becomes reuse if something nearby wants it: a district-heating network, a greenhouse operator, a swimming pool, an industrial process. On a remote plot chosen for cheap land and a fast grid connection, there is often no such customer within reach, and the heat simply goes up a cooling tower.

So the mandate quietly rewrites the siting calculation. The variable that used to decide where you build, cheapest power and land, now shares the table with a second one: is there a buyer for the heat. That pulls new German capacity toward towns and industrial clusters with heat networks and away from isolated fields, and it rewards operators who lock in an offtake agreement before they break ground. The law allows a deferral only where a municipality or utility commits to build a heat network within ten years, or where no local network will accept the heat.

The push to soften it tells you it binds

The clearest evidence that these rules bite is that Germany's coalition is already weighing amendments to relax them, and industry is lobbying for exactly that. Operators do not spend political capital loosening a rule that costs nothing, so the reform fight is a signal: for a real project, heat reuse and the PUE ceiling are binding constraints, not paperwork. Whether the relief arrives, and how deep it cuts, is now its own planning risk to track.

For anyone planning German capacity in the next two years, the practical move is to treat the current text as the baseline and design to it. Confirm heat offtake before you commit to a location, price the recovery equipment and piping into the budget from day one, and watch the amendment process rather than assume it will rescue a site that cannot shed its heat. Germany is the largest data-centre market on the continent, so where it sets the bar tends to shape what neighbouring regulators reach for next.

Frequently asked questions

Does this apply to data centres already running?

Partly. The strict new-build targets, PUE 1.2 and 10 percent heat reuse rising to 20 percent, apply to centres put into operation from 1 July 2026. Existing centres are not exempt: they face phased PUE ceilings of 1.5 by 2027 and 1.3 by 2030, the 100 percent renewable requirement from 2027, and the energy-management obligation, so an older site still has a compliance path to plan for.

What actually counts as reusing waste heat?

The Energy Reuse Factor under DIN EN 50600-4-6 measures the share of a centre's total energy redirected outside its own IT and cooling for productive use, calculated as reused energy over total consumption. In practice that means feeding warm water into a district-heating network or an industrial or agricultural process, not simply running more efficient cooling, which improves PUE but does not count as reuse.

Can a project get an exemption?

There is a narrow deferral rather than a blanket exemption. A site can postpone the heat-reuse duty where a municipality or energy supplier formally commits to developing a heat network within ten years, or where local networks are unwilling to take the residual heat. That still requires documentation, so it is a reason to open the heat-offtake conversation early rather than a way to avoid it.

For years the German data-centre question was where power is cheapest, and now it is who will take the heat, which is a harder question to answer after the land is bought than before.

GermanyEnEfGData CentresWaste HeatPUEEnergy EfficiencySiting

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