The largest data centre in Epoch AI’s ranking is Microsoft’s Fairwater campus in Mount Pleasant, Wisconsin. Epoch’s database, updated October 5 2026, puts it at 2,263 megawatts (MW) of planned IT power by May 2028. For comparison, Europe’s largest campus in the same database, Start Campus in Sines, Portugal, ranks 47th at 233 MW.
Ten of the 93 campuses are planned as gigawatt data centres, at 1,000 MW or more. Nine are in the United States. The tenth is Stargate UAE in Abu Dhabi. China’s largest campus in the database, VNET’s site in Ulanqab, ranks 17th at 700 MW.
This ranking uses planned IT power: the electricity that reaches the servers and networking kit, not the cooling or the rest of the building. Planned is what a campus is expected to reach once fully built. Live is what Epoch estimates is running today. All figures are estimates from satellite imagery, permits and company statements, and Epoch’s database covers an estimated 43% of the world’s AI computing power, so campuses it has not catalogued are not ranked here.
What Are the Largest Data Centres in the World?
The table ranks the 20 campuses with the highest planned IT power in Epoch’s data and shows live capacity beside the planned figure. “Not listed” means Epoch has no owner or chip supplier for that campus. An asterisk marks an owner Epoch does not treat as certain: it rates Google’s ownership of Goodnight as speculative, and G42’s ownership of Stargate UAE as likely. The top five planned figures, and the live leaders, match Epoch’s public chart of October 5 2026. Shackelford County at 1,400 MW and QTS Cedar Rapids at 1,133 MW match their campus pages from the same update.
Who Is in the Gigawatt Club?
No campus in the database has reached 1 gigawatt of live IT power. Colossus 2 in Memphis is closest, at 946 MW. Epoch lists it under SpaceXAI, the name xAI took in July 2026 after SpaceX announced its acquisition of the company in February 2026. Amazon’s New Carlisle campus follows at 910 MW. Microsoft’s Fairwater Atlanta campus is already at its planned 636 MW.
Epoch does not publish a company league table. Across all 93 campuses it covers, combined live IT power is 13.8 GW. This piece does not sum ownership, because those totals are not a published Epoch figure. Google’s Goodnight campus is tagged speculative, and some campuses have no owner listed, so a company ranking would mix certain and uncertain sites.
OpenAI’s Stargate locations include Abilene in Texas, Port Washington in Wisconsin, Saline Township in Michigan, Milam County and Shackelford County in Texas, and Doña Ana County in New Mexico, according to OpenAI. The company says it is working to expand its US AI infrastructure to 10 GW by 2029. Epoch lists all six of those campuses within the top 20. An Epoch review from 17 April 2026 used total facility power figures, including about 1.2 GW for Abilene and about 2.0 GW for Shackelford.
Meta said on July 13 2026 that it is expanding Hyperion, in Holly Ridge, Richland Parish, Louisiana, to 5 GW of compute capacity, with more than $50 billion of investment in the parish. Epoch’s IT-power estimate for the site is 1,632 MW, with full power dated January 2028. The two numbers describe different things: Meta’s figure is the planned campus, and Epoch’s is estimated IT power on an earlier date. Mark Zuckerberg said in July 2025 that Prometheus in New Albany, Ohio, would bring a 1 GW cluster online in 2026. Epoch lists 471 MW live there, with 1,022 MW planned by July 2028.
Where Does China Rank?
Epoch lists VNET’s Ulanqab campus at 221 MW live and 700 MW planned, running Huawei Ascend 910C chips. Huawei’s Wuhu campus follows at 457 MW (23rd) and its Horinger campus at 346 MW (33rd). No Chinese campus in the database reaches 1,000 MW. MRKT3.0’s separate guide to the largest data centres in China ranks those sites in detail.
The Gulf and Asia Contenders
OpenAI announced Stargate UAE on May 22 2025 as a 1 GW cluster in Abu Dhabi, with 200 MW expected to go live in 2026. Mubadala’s group chief executive, Khaldoon Al Mubarak, said in December 2025 that the first 200 MW would be ready in the third quarter of 2026. Epoch’s database shows no live capacity at the site as of the October 5 update.
Saudi Arabia’s Humain does not appear in Epoch’s database, so its campuses are not ranked. AMD said on 31 August 2026 that production AI infrastructure with AMD Instinct MI355X chips is live in Saudi Arabia, and that AMD, Cisco and Humain plan to deploy up to 250 MW beginning in 2027.
In Johor, Malaysia, Epoch lists DayOne Nusajaya at 473 MW (22nd) and DayOne Kempas at 421.7 MW (25th), both live at those figures as of its update, with NVIDIA H100 and B300 chips at Nusajaya and B300 chips at Kempas. Its database lists no Singapore campus.
Where Does Europe’s Biggest Campus Sit?
Europe’s largest campus in Epoch’s database, Start Campus in Sines, Portugal, ranks 47th. Its chips are owned by Nscale and used by Microsoft. Only 33 MW is live so far, on NVIDIA B300 chips, against 233 MW planned by September 2027.
That is only the first stage of the campus. Epoch says the six-building site is planned to reach 1.2 GW by 2030. At that size it would sit in the global gigawatt club, but that figure is the full campus, not estimated IT power, so it is not ranked here.
Several larger European projects are not in Epoch’s database at all. A Paris-region campus backed by MGX, Bpifrance, Mistral AI and NVIDIA was announced in May 2025 with 1.4 GW of AI data centre capacity, due to start operating in 2028. Fluidstack announced a 1 GW AI supercomputer in France in February 2025. DayOne plans up to 560 MW of grid power in Nurmijärvi, Finland. None of these figures is IT power, so none is ranked.
Whose Chips Power the Top 20?
Epoch lists NVIDIA chips as the main supplier at 11 of the top 20 campuses, Amazon’s Trainium chips at three, and Huawei’s Ascend 910C at one, the VNET campus in Ulanqab.
For the remaining five, Epoch lists no chip supplier. B200 and B300 are NVIDIA’s Blackwell generation. Rubin is the generation NVIDIA has scheduled after Blackwell. Trainium2 and Trainium3 are Amazon’s own chips. Ascend 910C is Huawei’s.
Export controls shape who can buy chips for the Gulf campuses. The US Commerce Department said on November 19 2025 that G42 and Humain were receiving approval to purchase the equivalent of up to 35,000 NVIDIA Blackwell GB300 chips, subject to security and reporting requirements.
Why Megawatt Rankings Can Mislead
Planned capacity and live capacity differ widely in the top 20. Epoch’s April 2026 review of OpenAI’s US sites separates announced capacity from built capacity, and notes that plans can change after construction begins. MRKT3.0 has also reported on electricity becoming the main competitive factor in AI, and on the political resistance facing new data centres in Europe and the United States.
Computing output per megawatt also varies. An H100-equivalent is Epoch’s name for the computing power of one NVIDIA H100 chip. Dividing Epoch’s H100-equivalent estimates by live IT power yields about 1,209 per MW at Microsoft’s Fairwater Atlanta campus, 754 at Amazon’s New Carlisle campus, and 556 at VNET’s Ulanqab campus. Epoch derives these estimates from chip type and efficiency, so two campuses with the same megawatts can deliver different amounts of computing.
The size-based view also leaves out the model Europe uses. MRKT3.0’s Europe versus US AI infrastructure analysis reports that the EU’s 19 AI factories are spread across member states, and that this model favours resilience and broad access over raw capacity.
Author: Ayanfe Fakunle
See Also:
Where Will Europe Actually Put Its Data Centres?
What Country in Europe Has the Most Data Centres?
Largest Data Centres in China: Who Runs Them (2026)
Frequently Asked Questions:
It is the electricity that reaches the servers and networking equipment. Cooling and the rest of the building sit outside it. Epoch estimates facility power separately, using a peak PUE of about 1.2 for hyperscalers such as Google and Amazon and about 1.4 otherwise.
Microsoft Fairwater in Wisconsin, at 2,263 MW of planned IT power. Colossus 2 in Memphis is the largest already running, at 946 MW.
Not in live IT power, on Epoch’s October 5 2026 update. Colossus 2 is closest, at 946 MW live. Ten campuses are planned at 1,000 MW or more. Planned is not the same as running.
Start Campus in Sines is 47th, at 233 MW of planned IT power by September 2027, with 33 MW live. The same site is permitted for 1.2 GW by 2030. That larger figure is not IT power, so it is not given a rank here.
