SemiAnalysis forecasts 51 GW of new data-center capacity outside China in 2027

The data-center industry could add more capacity outside China in 2027 than in the preceding year twice over. SemiAnalysis forecasts about 51 gigawatts of additions, compared with 25 gigawatts in 2026, according to Yahoo Finance. Its case rests partly on projects already taking shape, rather than a pipeline made entirely of proposed sites.

The measurement matters: these are annual additions to IT capacity, not the size of the entire data-center fleet or the electricity it consumes. SemiAnalysis estimates that the projected single-year expansion would roughly match the world’s cumulative data-center buildout through 2024.

A construction pipeline, not a delivery guarantee

About three-quarters of the projected 2027 additions come from projects SemiAnalysis classifies as already operational or under construction. The remaining quarter is still planned. That split gives the forecast a different footing from a tally of announced ambitions, while leaving a meaningful share dependent on projects that have not yet reached construction.

The firm identifies more than 24 gigawatts across 40 campuses in advanced construction, with delivery expected in 2027. Those campuses provide a concrete basis for its confidence in acceleration. Their expected delivery dates remain forecasts, however; advanced construction is evidence of progress, not the same thing as completed capacity.

There is a sharply different view of the achievable pace. At September’s All-In Summit, Altimeter Capital’s Brad Gerstner called SemiAnalysis’s then-43-gigawatt forecast too aggressive and predicted closer to 25 gigawatts. His criticism addressed that earlier estimate, not the current 51-gigawatt figure. His alternative would leave annual additions near the projected 2026 level.

Moving work from the site to the factory

SemiAnalysis points to modular construction as one way to compress delivery schedules. Suppliers build electrical rooms and cooling systems in factories while crews prepare the site. Rather than waiting to assemble everything on location, builders can carry out those tasks in parallel. Some of the resulting modules weigh 50,000 pounds.

Amazon is deploying its own modular design at large scale, while Meta has used tent-like halls to enclose buildings faster, according to SemiAnalysis. These approaches tackle the construction schedule through different designs. In the firm’s modeled comparison, the largest time saving comes from electrical and mechanical installation.

One modeled hall, two construction schedules

0122 months

Conventional construction

SemiAnalysis’s estimate for a 50-megawatt AI data hall, excluding permitting.

0214 months

Fully modular construction

The same modeled hall with a fully modular approach, also excluding permitting.

That eight-month difference has an economic value beyond finishing a building sooner. SemiAnalysis estimates the head start could be worth about $200 million to the owner of the chips inside.

More equipment per megawatt

The shift also changes the opportunity for equipment suppliers. SemiAnalysis estimates that Vertiv’s equipment content per megawatt could roughly double, reaching as much as $7 million when it supplies the full modular stack.

Comfort Systems USA and Sterling Infrastructure also assemble modules. But faster assembly addresses only one part of delivery: power availability can still delay projects. A usable data center requires the building, electricity and chips to arrive together.