A monumental AI data centre promises to remake a forgotten Croatian town and shift Europe’s digital map. But as the US-led consortium celebrates, a local politician is asking the one question on everyone’s mind: is any of this real?
Topusko is not a town you associate with the bleeding edge of artificial intelligence. Tucked away in central Croatia, this community of fewer than one thousand people is better known for its hot springs and the ruins of a 13th-century abbey. It’s a place still bearing the quiet scars of the 1990s wars, officially designated an “Area of Special State Concern.” Yet, this unheralded backwater is now the heart of a project of staggering ambition: a €50 billion hyperscale AI data centre campus named Pantheon AI.
The announcement, made at the Three Seas Initiative summit in Dubrovnik, sent some ripples across Europe. An American-led investment vehicle, Pantheon Atlas, revealed plans for a €12 billion campus construction, with the total investment rocketing to €50 billion once hyperscale tenants install their own equipment. It represents the largest foreign investment in Croatia’s history, dwarfing the country’s average annual FDI. For a region hungry for transformative projects, it seemed like a dream made manifest.
The stuff of digital dreams
The specifications for Pantheon AI are nothing short of colossal. The 310-acre site is designed to deliver one gigawatt of total capacity, with 800 MW of usable IT load built to NVIDIA’s GW-Scale AI factory standard. It promises to create three thousand construction jobs and another 1,500 permanent roles in a county where unemployment is nearly double the national average.
The project’s logic is a direct response to a major bottleneck in Europe’s digital expansion. The continent’s traditional data hubs — Frankfurt, London, Amsterdam, Paris, and Dublin (the FLAP-D markets) — are bursting at the seams. With vacancy rates plummeting and grid connection waits stretching up to a decade, hyperscalers are desperate for new territory. AI workloads are projected to account for half of all data-centre demand by 2030, and they need power, land, and stability.
“We have lined up the power, fiber, regulatory stability, and institutional support to solve that problem in Europe,” explained Ryan Rich, Managing Partner of Pantheon AI, at the announcement.
Croatia, an EU and NATO member with available land and a favourable energy profile, suddenly found itself in the perfect position to fill this structural gap. The project’s American parentage was also heavily emphasised. Joshua Volz, Special Envoy for Global Energy Integration at the US Department of Energy, framed the deal as a strategic win, noting, “Critical infrastructure of this scale, built by the private sector responding to real market demand, is exactly how US interests and European security advance together.”
A green power play
Perhaps the most audacious part of Pantheon’s plan is its answer to the data centre industry’s insatiable thirst for energy. The campus will be powered by a dedicated 500 MW solar plant and a massive 8,000 MWh battery storage system built on-site. Developed by Greenvolt, this behind-the-meter solution is designed to make the campus fully self-sufficient on renewable energy, sidestepping the congested national grids that cripple projects elsewhere.
Furthermore, the project includes the construction of four new high-voltage transmission lines that will not only serve the data centre but also enable the integration of up to 5.2 GW of additional renewable capacity onto Croatia’s grid. This dual benefit — solving a private power need while enhancing public infrastructure — is a core part of the project’s appeal. It addresses both the urgent commercial demand for power and the EU’s long-term green energy goals. It’s a powerful vision of a future where big tech’s expansion can accelerate, rather than hinder, the energy transition.
From euphoria to scrutiny
But as the initial euphoria settles, a healthy dose of scepticism is beginning to surface, articulated most clearly by Marijana Puljak, a computer scientist and member of the Croatian Parliament. While stressing that she is “rooting for it, but I’m asking questions,” Puljak took to social media to highlight that the grand announcement left a trail of unanswered, and rather fundamental, questions.
Her concerns cut to the heart of the project’s commercial and financial viability. The first, and most critical, is the question of customers. “Who are the end users?” Puljak questioned, pointing out that a project of this magnitude is financially unfeasible without anchor tenants — the global tech giants known as hyperscalers — committed through legally binding pre-let agreements. “Have any of the big names like Amazon, Google, or Microsoft actually signed on? Without them, this is a speculative build of historic proportions.”
Puljak also pointed to the opacity of the investment group itself, describing the American investors as an “agile startup from San Francisco with a dozen employees” and questioning their experience. She queried the track record of Pantheon Atlas, described as a transatlantic vehicle for institutional investors and high-net-worth individuals. “Can they point to other gigawatt-scale projects they have successfully financed and delivered?” she probed, noting the “huge operational risk” between software development and the physical construction of “heavy-duty” energy infrastructure. She further asked whether the staggering €50 billion figure — nearly 60% of Croatia’s GDP — is fully secured or still at the level of “letters of intent.”
A numbers game that doesn’t add up?
Beyond the commercial questions, Puljak, an IT engineer by profession, zeroed in on the project’s technical and logistical blueprint. A key concern is the exceptionally ambitious timeline. With construction slated to begin in early 2027 and the campus fully operational by the first quarter of 2029, she questioned the logistical reality of a two-year window, especially when “3.5 gigawatts of domestic renewable energy projects have been waiting for years for a grid connection.”
Even more fundamentally, she raised serious doubts about the project’s much-touted energy self-sufficiency. A one-gigawatt data centre, she pointed out, would consume electricity equivalent to “approximately 40% of Croatia’s current total consumption.” The plan calls for a 500 MW solar plant to power this demand. Puljak highlighted the glaring discrepancy, noting that due to solar’s intermittent nature, the power plant could only cover “about ten percent of the data center’s constant energy needs” because the processors must operate 24/7. This raises serious questions about how the project will bridge the massive energy gap and its claim of being “fully self-sufficient.”
“Technology does not tolerate PR, it only tolerates exact mathematics,” Puljak stated, calling for a shift from public relations to a credible and verifiable plan. As she succinctly put it, “the devil is in the details, and here the details are massive.”
For now, Project Pantheon exists as a tantalising vision for Croatia and for a Europe desperate to build out its AI capacity. It is a testament to Central and Eastern Europe’s growing appeal as a destination for strategic capital. But turning this vision into a functioning, €50 billion reality will require more than just a slick presentation in Dubrovnik. It will require concrete answers, confirmed partners, and a clear demonstration that this oasis is not simply a mirage.
