Pantheon Atlas maps €50 billion AI campus in Croatia powered by 500 MW solar and 2,000 MW storage

A major technology-and-energy buildout is taking shape in central Croatia, where Pantheon Atlas has presented plans for an artificial intelligence campus designed to run on clean power. For investors and grid planners alike, the proposal links hyperscale computing growth with large-scale renewable generation and storage—while also requiring transmission expansion to move more electricity into the national system.

Topusko campus powered by solar and large battery storage

The planned integrated facility would be located in Topusko and combine advanced data infrastructure with on-site electricity generation. The energy package includes a planned 500 MW solar power plant along with a large-scale battery storage system sized at 2,000 MW with 8,000 MWh of capacity. The electricity produced by these assets is intended to supply the campus directly.

Portugal-based Greenvolt International Power has signed a letter of intent to support development of the on-site energy solutions.

Grid upgrades aimed at integrating more renewables

Beyond the campus itself, the project includes substantial upgrades to the regional power network. Plans call for construction of four 400 kV transmission lines intended to enable integration of up to 5.2 GW of additional renewable capacity into Croatia’s electricity system. If delivered as outlined, that would expand the country’s ability to absorb and distribute clean energy—an issue that becomes more pressing as new renewables come online.

Data center scale and phased timeline

The main data center complex is expected to reach 1 GW of installed capacity, with about 800 MW reserved for artificial intelligence computing workloads. The site would initially cover more than 125 hectares, with potential expansion to roughly 180 hectares depending on future demand.

Construction of the first phase—valued at around €12 billion—is scheduled to begin in early 2027, with commissioning planned for early 2029. Over the longer term, total investment could exceed €50 billion as additional hyperscale tenants expand operations within the facility.

Jobs and local government support

The project is also positioned as an economic driver for the region. Approximately 3,000 jobs are expected during construction, followed by around 1,500 permanent roles once the campus becomes operational.

Local authorities in Sisak-Moslavina County have already signaled support through a formal cooperation agreement intended to facilitate project development.