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Artificial intelligence gains one of its biggest bets in Europe with campus announced in Croatia, gigawatt-scale data center, on-site renewable energy, and promise to transform Topusko into a regional hub of digital infrastructure.
Artificial intelligence took center stage in a billion-dollar announcement in Croatia with the presentation of the Pantheon AI project, an innovation campus and hyperscale data center planned for Topusko. Led by the group Pantheon Atlas LLC, the venture plans to begin construction in early 2027 and full operation by the first quarter of 2029, with a campus of €12 billion within a total investment expected to exceed €50 billion as hyperscale tenants install equipment and technology.
The announcement draws attention for its size and strategic positioning. The project was presented in Dubrovnik, during the Three Seas Initiative Summit, and was described as the largest investment in Croatia’s history and one of the largest private investments by the United States in Europe. On the technical side, the structure promises 1 GW of total capacity, 800 MW of IT load, full supply by renewable energy, and creation of 1,500 permanent jobs, in addition to 3,000 roles during the construction phase.
What is Pantheon AI and why it draws so much attention
Pantheon AI was designed as a digital infrastructure complex aimed at the new global race for artificial intelligence. The proposal is to create in Croatia a facility ready to serve hyperscale operators from the United States and Europe within the territory of the European Union and NATO, at a time when the demand for data center capacity driven by AI is growing faster than the supply of energy, land, and construction on the continent.
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According to the announcement, the campus will follow NVIDIA GW-Scale AI Factory standards and promises availability level above Tier IV, something presented as a rare differential in Europe. The ambition is not just to build a data center, but to set up a large-scale base for processing, storage, and expansion of digital infrastructure in a region that does not yet have an optimized facility for gigawatt-scale AI.
The numbers that explain the size of the megacampus
The project data helps to gauge why it was treated as an out-of-standard work. The campus will have 310 acres, with the possibility of expanding to 450 acres, and starts with 1 GW of total capacity, of which 800 MW will be IT load. Additionally, the structure will have four independent fiber routes distributed across three major European Union corridors.
In the energy field, the scale is also impressive. The site will be powered by its own 500 MW solar plant, installed “behind the meter,” accompanied by 8,000 MWh of battery storage. The transmission system, with four independent 400 kV lines, was designed to allow the integration of up to 5.2 GW of new renewable energy into the Croatian power grid.
How energy and connectivity support the bet on artificial intelligence
One of the central axes of the project is the combination of electrical power, resilience, and connectivity. The campus was planned to operate with on-site renewable energy and to have the capacity to respond to an intense processing demand associated with artificial intelligence, something that currently pressures more traditional data centers in Europe.
In connectivity, Pantheon AI was designed to connect to multiple strategic routes and corridors. The announcement also mentions the GreenMed submarine cable, which is expected to extend reach to Milan in 2028, reinforcing the integration of the campus with digital networks and continental data routes. This helps explain why the project is treated as critical infrastructure and not just as a large-scale real estate project.
What changes in practice for Croatia and the region
In practice, the plan aims to place Croatia in a new position on the map of European digital infrastructure. The announcement states that the venture could establish the country as a regional hub for digital infrastructure, leveraging network access, regulatory base, local relationships, and a location 45 minutes from Zagreb, in addition to three nearby cities capable of expanding the labor supply.
This move gains even more weight because the already consolidated data center hubs in Europe operate with a vacancy below 8%, while delays in connections to the power grid increase the pressure. At the same time, the demand for electricity for data centers in Central and Eastern Europe is expected to grow three to four times by 2035, according to the announcement, which opens up space for ventures of this size.
Jobs, construction, and economic impact
The project promises a significant wave of jobs on two fronts. During construction, the forecast is for 3,000 positions, while after completion, the campus is expected to sustain 1,500 permanent jobs. This makes the venture a bet not only on technology but also on regional economic dynamization.
On the financial plan, the scale is even larger. The campus itself was announced at €12 billion, but the total investment could exceed €50 billion when hyperscale occupants begin to deploy equipment and technology on a large scale. Therefore, the initiative was presented as the largest investment in Croatian history and one of the largest American private investments ever made in Europe.
Who is behind the project
Pantheon Atlas LLC appears as the investment vehicle for the project, bringing together institutional investors from the United States and high-net-worth individuals. Among the announced partners are Greenvolt International Power, responsible for a letter of intent for the solar plant of 500 MW and batteries of 2,000 MW / 8,000 MWh, in addition to companies and groups linked to transmission, substation, engineering, financial consulting, and data center design.
Also appearing in the project’s ecosystem are the Končar Group, Dalekovod Projekt, Ravel Ltd., Parsec Lab, as well as consultancies and advisories like PwC, KPMG, Latham & Watkins, and Hodgson Russ. The regional authority of Sisak-Moslavina County itself formally recognized the venture as of special importance to the region and signed a cooperation agreement to support the necessary conditions for its realization.
The next steps until 2029
The disclosed schedule indicates the start of construction at the beginning of 2027. The goal is to have the campus fully operational by the first quarter of 2029, which means a relatively short window for a project that combines data center, power transmission, battery storage, fiber, substation, and its own solar generation.
Until then, the project will have to convert the announcement into physical and operational execution. The speed of this delivery will be decisive because the proposal arises precisely to address a structural gap in Europe, where the race for capacity aimed at artificial intelligence already pressures energy, land, connection, and availability on a scale.
Why this project goes beyond a common data center
What makes the announcement so striking is the combination of industrial scale, its own energy infrastructure, and geopolitical competition for technological leadership. Pantheon AI was presented as a response to a structural lack of capacity for AI in Europe and as an asset built on allied, democratic territory protected by European data sovereignty rules.
Therefore, the project is not just about servers and cables. It represents an attempt to transform Croatia into a relevant piece of a new digital economy, where energy, computing, location, and data storage rules become as valuable as roads, ports, and airports were in previous development cycles.
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