The biggest data centers in the world are hyperscale campuses operated by Microsoft, AWS, Google, and Meta, with individual facilities exceeding 1 million square feet and drawing over 1 GW of power. These facilities house the GPU clusters that train and serve every major AI model you interact with today.
Top 10 Biggest Data Centers in the World by Power Capacity
Power capacity is the most meaningful way to rank data center size because it directly determines how many servers a facility can operate. Floor space alone is misleading. A 500,000-square-foot facility running at 100 kW per rack holds far more compute than a 2-million-square-foot warehouse at 6 kW per rack. The following table ranks the largest operational and near-operational data center campuses by total IT power capacity as of early 2026.
| Rank | Facility / Campus | Operator | Location | Power Capacity | Floor Area | Status |
|---|---|---|---|---|---|---|
| 1 | Stargate (Abilene Campus) | Microsoft / OpenAI | Abilene, Texas, USA | 1.2 GW (Phase 1) | 750,000+ sq ft | Under construction |
| 2 | Mount Pleasant Campus | Microsoft | Mount Pleasant, Wisconsin, USA | 1.0 GW | 1,000,000 sq ft | Under construction |
| 3 | Citadel Campus | Switch | Tahoe Reno, Nevada, USA | 650 MW | 7,200,000 sq ft | Operational (expanding) |
| 4 | Langfang Campus | China Telecom | Langfang, Hebei, China | 600 MW | 6,300,000 sq ft | Operational |
| 5 | Prinevile Campus | Meta | Prineville, Oregon, USA | 500 MW | 4,500,000+ sq ft | Operational (expanding) |
| 6 | Papillion Campus | Meta | Papillion, Nebraska, USA | 400 MW | 2,400,000 sq ft | Operational (expanding) |
| 7 | Hamina Data Center | Hamina, Finland | 400 MW | 950,000 sq ft | Operational | |
| 8 | The Dalles Campus | The Dalles, Oregon, USA | 350 MW | 1,500,000 sq ft | Operational (expanding) | |
| 9 | Ashburn Data Center Row | AWS / Equinix / QTS | Ashburn, Virginia, USA | 300+ MW (AWS alone) | 3,000,000+ sq ft | Operational |
| 10 | Council Bluffs Campus | Council Bluffs, Iowa, USA | 300 MW | 1,000,000 sq ft | Operational |
Why These Facilities Are Growing So Fast
The rapid expansion of the biggest data centers in the world is driven by one factor above all others: AI training compute demand. As every hyperscaler races to build larger GPU clusters, power requirements have escalated at a pace the industry has never seen. Microsoft, Amazon, Google, and Meta collectively committed over $300 billion in capital expenditure for 2025 and 2026, with the majority directed toward data center construction and AI hardware procurement.
You can understand the scale by looking at power density. A traditional enterprise data center runs at 6 to 8 kW per rack. An AI data center loaded with NVIDIA DGX B200 systems runs at 120 kW per rack. That 15x density increase means a single AI training hall consuming 100 MW can hold 800 high-density racks, each containing eight GPUs. A campus like Stargate at 1.2 GW could theoretically house over 75,000 GPUs in its first phase alone.
Power and Sustainability Challenges at Gigawatt Scale
Building a data center is one problem. Powering it is another. A 1 GW campus draws as much electricity as a city of 750,000 people. Grid operators in Texas, Virginia, and the Midwest are already struggling to meet demand from facilities that went online in 2024 and 2025. Dominion Energy in Virginia reported a 85% increase in data center power applications between 2023 and 2025.
Understanding how much energy AI uses reveals why operators are turning to alternative power sources. Microsoft signed a 20-year power purchase agreement to restart Three Mile Island Unit 1, a 837 MW nuclear reactor in Pennsylvania, exclusively for data center supply. Amazon acquired a nuclear-powered data center campus from Talen Energy in Pennsylvania for $650 million. Google committed to purchasing power from small modular reactors (SMRs) being developed by Kairos Power, with first delivery expected by 2030.
What Comes Next: 2 GW and Beyond
Industry analysts at Synergy Research Group expect the number of hyperscale data centers worldwide to exceed 2,000 by the end of 2027, up from roughly 1,300 in 2025. Individual campus power capacities will continue climbing. xAI’s planned Memphis facility targets 150 MW of initial capacity with room to scale to 1 GW. Oracle announced plans for a 2 GW campus in partnership with energy providers, which would make it the single largest data center ever constructed if completed.
Frequently Asked Questions
What is the largest data center in the world right now?
The Switch Citadel Campus in Tahoe Reno, Nevada holds the record for the largest operational data center by floor area at 7.2 million square feet with 650 MW of power capacity. By power alone, Microsoft’s Stargate project in Abilene, Texas will surpass it at 1.2 GW when Phase 1 completes.
How much does it cost to build a hyperscale data center?
A hyperscale data center campus with 100 MW of IT load capacity costs between $1.2 billion and $1.5 billion for the building, power, and cooling infrastructure. Adding AI-optimized GPU servers raises the total investment to $3 billion to $6 billion depending on hardware density and configuration choices.
Why are data centers being built near power plants?
Data centers require massive, uninterrupted electricity supply that existing grid infrastructure often cannot deliver. Building near power plants, especially nuclear facilities, provides dedicated baseload power without straining regional grids. Amazon, Microsoft, and Google have all signed long-term agreements to co-locate facilities near nuclear and renewable energy generation sites.