Frankfurt remains one of Europe's most important data-centre markets, but its next phase of growth is increasingly constrained by the infrastructure that helped make it successful. CBRE's 2026 market review puts Frankfurt inventory at 1,222.5 MW in the first quarter, up 23% year over year, with vacancy still around 5%.
Different market reports use different definitions of commissioned capacity, which is why JLL's August 2026 figure of roughly 970 MW should not be treated as directly interchangeable with CBRE's inventory number. Both sources point to the same structural conclusion: Frankfurt remains a dominant European hub and available capacity is tight.
The growth boundary is moving away from Frankfurt
CBRE says new projects are increasingly being planned farther from the immediate city, extending the development boundary to locations around 40 kilometres away. JLL identifies a broader European shift, with hyperscale projects planned for 2026 to 2028 averaging about 175 kilometres from major hubs compared with 46 kilometres for projects completed from 2022 to 2025.
That change is not simply cheaper land. AI infrastructure requires enormous power allocations, and grid connections in established markets can be the limiting factor. Frankfurt's central-area grid constraints are therefore changing where operators can build even while customer demand remains concentrated around the region.
Germany now has a better public data layer
Germany's Energy Efficiency Act requires operators of data centres above defined connection thresholds to report information, and the federal public RZReg register now provides annual reports, statistics and an interactive map. That creates a stronger foundation for tracking the market with first-party operational data rather than relying entirely on commercial estimates.
The register will become more useful as reporting coverage deepens. It can help separate individual facilities, energy performance and geographic concentration from headline market-capacity estimates that often use different methodologies.
Our view: German AI infrastructure will decentralise
Frankfurt is unlikely to stop being Germany's core interconnection market, but the biggest new campuses do not need to sit inside the traditional core if latency, fibre and customer requirements allow them to move outward. Power availability is becoming the decisive geography.
German Business Review will therefore build this cluster around capacity, grid access, new regional projects and the public data-centre register. The more useful long-term question is not how many data centres Germany has, but where the next gigawatts can actually connect.
| Metric | Reported figure | Source / treatment |
|---|---|---|
| Q1 inventory | 1,222.5 MW | CBRE methodology |
| Year-on-year inventory growth | 23% | CBRE |
| Vacancy | 5% | CBRE |
| Continental Europe market size | Approx. 970 MW | JLL methodology, not directly comparable with CBRE inventory |
| New development geography | Projects moving farther from core hubs | CBRE and JLL |
Frequently asked questions
How large is the Frankfurt data center market in 2026?
CBRE reports 1,222.5 MW of inventory in Q1 2026. JLL reports a lower figure under a different methodology, so the two numbers should not be combined.
Why are new German data centers moving farther from Frankfurt?
Grid constraints, land availability and planning restrictions are pushing large projects toward locations outside the traditional core while fibre and interconnection keep them linked to Frankfurt.