Europe’s push for more AI infrastructure is exposing a practical policy question: who must make a data center’s waste heat useful? WIRED’s new report examines Germany’s proposed relaxation of heat-reuse requirements and the disagreement surrounding it. Understanding that debate requires separating three things that are easily blurred together: the law currently published, a proposed change and voluntary measures for improving a facility’s efficiency.
The published law already distinguishes different circumstances
Germany’s Energy Efficiency Act, section 11, sets requirements for facilities beginning operation from July 2026. Its published text combines a power-usage-effectiveness ceiling of 1.2 with energy-reuse requirements that increase across successive opening dates: 10 percent initially, followed by planned shares of 15 and 20 percent for later cohorts. It provides a period after commissioning to meet the applicable annual-average requirements.
The text also contains specified exceptions to the reuse requirement. These include qualifying arrangements to develop nearby heat networks and circumstances involving an unaccepted heat offer, subject to conditions and evidence. It is therefore inaccurate to describe the published regime as an unconditional obligation that ignores every problem finding a heat customer. Equally, those exceptions are not a general exemption for any operator that would prefer not to supply heat.
This distinction changes the policy question. Legislators are not choosing between an entirely inflexible rule and the first recognition that local circumstances matter. They are deciding how a revised obligation would differ from the conditions already written into the law. A credible account should identify the particular requirement being changed rather than treating all environmental conditions as one undifferentiated barrier.
A proposal is not the same as an enacted exemption
WIRED describes a cabinet-backed amendment under which developers would assess whether heat reuse is technically and economically feasible, rather than face the existing mandatory reuse approach. Its account says parliamentary ratification is still ahead. The article also presents disagreement over whether available heat users should determine site selection or whether developers are being burdened with infrastructure they cannot control.
Those are competing judgments about how to allocate responsibility. They do not establish that every canceled development failed because of one statute, or that relaxing a requirement will necessarily produce more completed facilities. A proposed rule may change an investment calculation without resolving other constraints. Causal claims about individual projects need evidence about those projects, not simply the timing of a policy debate.
For a prospective site, the useful questions are concrete. Is there an identified heat user? Who would fund the connection? When would both sides be ready? A technical possibility without an agreed delivery arrangement is not the same as operating heat reuse. Conversely, an agreement worth pursuing should not disappear from view merely because an assessment can be completed on paper.
Efficiency and useful heat measure different things
The European Commission’s Joint Research Centre explained the distinction in its September 2023 account of the EU data-center code. The code is voluntary. One of its measures, PUE, compares total facility input power with power delivered to IT equipment. A lower ratio indicates less facility overhead, not a complete statement about a site’s wider environmental impact.
The JRC’s dated examples include German facilities using recovered heat for offices and storage, alongside cooling and airflow improvements. These are examples of implemented measures in particular settings, not proof that every future site can supply a municipal network on identical terms. The 2023 figures and awards should also not be presented as measurements of Europe’s current AI fleet.
The present debate consequently needs more than a promise of efficient computing or a headline about unused heat. It needs a visible account of what each requirement measures, who controls delivery and what evidence would demonstrate compliance. Germany’s proposed changes can be assessed on those terms without assuming either that climate conditions make construction impossible or that loosening them guarantees a successful AI infrastructure strategy.
