SemiAnalysis forecasts 51.2GW of new data-center IT capacity outside mainland China in 2027
DataNews Editorial Team
SemiAnalysis projects that markets outside mainland China will add about 51.2GW of new data-center IT capacity in 2027, more than double the 25GW level cited for 2026. The forecast is supported by late-stage construction, binding leasing commitments and faster modular deployment, but remains contingent on power availability.
- SemiAnalysis forecasts about 51.2GW of new IT capacity outside mainland China in 2027, versus 25GW cited for 2026.
- More than 24.3GW across roughly 40 campuses is reported to be in late-stage construction, but this is not confirmation of 2027 commissioning.
- The report estimates 75GW of cumulative North American orders for onsite and behind-the-meter generation by August 2026.
- Modular construction could shorten delivery of a 50MW AI data hall from 22 to 14 months, excluding permitting.
- Grid interconnection remains the principal constraint on converting construction and lease commitments into operational capacity.
SemiAnalysis forecasts approximately 51.2GW of new data-center IT capacity outside mainland China in 2027, compared with 25GW in 2026 and 15.6GW in 2025. The figure is a forecast rather than confirmed operational capacity.
The report points to more than 24.3GW of data-center capacity across roughly 40 campuses in late-stage construction, with delivery expected in 2027. It also cites legally binding, non-cancellable data-center leases worth just under US$1 trillion signed globally since the start of 2026, alongside increased self-build activity by hyperscalers.
Construction methods are part of the delivery case. SemiAnalysis says a 50MW AI data hall built conventionally requires 22 months, while a fully modular approach can reduce the period to 14 months, excluding permitting. The report estimates that modular construction can cut on-site labour requirements by up to 63%.
Power remains the central execution risk. In North America, SemiAnalysis estimates cumulative orders for onsite and behind-the-meter generation serving data centers reached 75GW by August 2026, with 22 equipment suppliers participating. These orders do not equate to commissioned capacity or assured power delivery, but indicate the scale of demand for alternatives to delayed grid interconnections.
The report illustrates the interconnection constraint with Microsoft's decision to abandon a 50MW data-center lease near London, where power availability was expected only in the 2030s. This suggests that rapid building deployment and modularisation may not translate directly into operational IT capacity where grid access is constrained.
If the SemiAnalysis projection is realised, demand could rise sharply for prefabricated construction modules, cooling systems, electrical equipment, gas turbines, reciprocating engines and fuel cells. However, onsite generation may mitigate, rather than universally resolve, delays in utility interconnection. Brad Gerstner has publicly challenged an earlier SemiAnalysis forecast, estimating actual 2027 deliveries at about 25GW—well below the 51.2GW projection.
If realised, the forecast would represent an exceptional acceleration in AI-oriented data-center delivery and intensify demand for construction capacity, cooling, electrical equipment and local generation. The report also reinforces that grid access—not only building delivery—is increasingly the decisive constraint on commissioning.
- — / October 25, 2026 · ChineseSource →
This article was prepared by the DataNews editorial team based on the sources listed above.