Europe is trying to expand its data center capacity while cutting greenhouse gas emissions. Germany’s debate over whether operators should have to reuse waste heat puts that tension in focus: a rule intended to support climate goals became a point of concern for developers, and the government moved to soften it.
Germany’s goals meet a practical constraint
Earlier this year, the German government set out a plan to double the scale of the country’s data center fleet by 2030 and quadruple the amount of compute available for running artificial intelligence models. The stated aims included reducing dependence on the United States for access to AI and boosting the country’s faltering economy.
Those ambitions sit alongside the EU commitment to cut greenhouse gas emissions by 55 percent by the end of the decade. Data centers need energy, and Germany’s previous administration tried to connect their operation with another climate-related need: clean heat.
Under the Energy Efficiency Act, passed in 2023, new data centers had to recycle a portion of the heat generated by their computer equipment. The intended destination was nearby municipal heating systems, though other possible users included industries such as greenhouse agriculture.
Why the heat rule became contentious
The problem, according to developers, was that heat reuse depends on there being a suitable recipient nearby. If no municipal system or industrial user can take the heat, an operator may have little control over whether reuse is possible. Developers argued that the original requirement could leave them responsible for meeting a condition that depended on factors outside their control.
Barbara Smitten, associate director for critical systems at consulting firm Cundall, said the burden seemed to fall on data centers. The German Data Center Association described an early version of the bill as a “data center prevention act.”
Patrick Graichen, who served as a senior official at Germany’s Ministry for Economic Affairs and Energy at the time, took a different view. He argued that developers should treat the availability of a heat user as a standard factor when choosing a site. John Booth, managing director at IT consultancy Carbon3IT, said the technologies and concepts for reusing heat are well known when a suitable offtake is available.
The revised law changes the obligation
In June, a month before the rules were due to take effect, the German federal government walked them back. Under an amended bill, operators would no longer have to reuse waste heat. Instead, they would have to assess whether reuse is economically and technically feasible; if it is not, they are exempt. The change was due to go to the German parliament for ratification imminently.
Katherina Reiche, federal minister for economic affairs and energy, said the cabinet’s change would create conditions for digital sovereignty and economic growth. Smitten said the amendment could make the German market appear more attractive to data center firms by reducing the risk associated with the earlier requirement.
That adjustment changes how the climate goal is applied. The earlier rule required reuse; the amended approach requires an assessment. This may make it easier to propose projects, while leaving the actual use of waste heat dependent on whether a technically and economically feasible outlet exists.
Project cancellations and public concern
Several German proposals have fallen through in the last 18 months. Stack Infrastructure canceled a $3 billion facility in Hesse, and state-owned Komm.ONE withdrew from a project in Baden-Württemberg. The reasons a development fails are not always clear, but Komm.ONE pointed directly to the burdens of the Energy Efficiency Act.
Relaxing the requirement may address one concern raised by developers, but it does not settle the broader dispute over data center growth and climate policy. In February, the city council of a small German town voted to block a $2.5 billion data center development, partly over climate concerns.
The source article describes a similar push and pull across Europe: governments want to benefit from the growth of energy-intensive AI and limit dependence on the United States, while protecting the climate. Public unease about that trade-off could make new projects harder to advance. As Graichen put it, attitudes toward data centers had changed sharply in the last year, and he expected that shift to reach Europe.
A question of where growth fits
Germany’s policy change illustrates a central practical issue: the case for reusing data center heat depends on more than the technology inside a facility. It also depends on whether a heating system or another user can take the heat, and whether reuse is feasible at that particular site.
For policymakers, the challenge is to encourage digital infrastructure without losing sight of emissions commitments or public concerns. For developers, a more flexible rule may reduce one obstacle, but it leaves the question of climate impact and local acceptance in view. The balance between those priorities will shape how easily Europe can expand its data center capacity.