The establishment of the Pantheon AI campus in Topusko marks a pivotal moment for Croatia’s energy landscape, necessitating a substantial investment in transmission infrastructure estimated between €400 million and €450 million. This initiative is poised to support one of the nation’s most ambitious technology projects, with construction of essential power assets slated to commence in late 2027.
As detailed by project leaders, including Mario Gudelj and Bruno Štambak, the development of specialized power infrastructure is critical for the future AI data center, projected to be valued at approximately $50 billion. Financing for this extensive transmission network has reportedly been secured, with plans aiming for initial operational users to begin utilizing the facility by early 2029.
The proposed electricity network will feature a new 400 kV transmission system comprising four lines that will extend around 300 kilometers. Additionally, a transformer station is planned to be constructed, which is anticipated to become Croatia’s largest upon completion. These assets are intended for eventual transfer to the Croatian transmission system operator, HOPS.
Designed with robust redundancy and reliability measures, the infrastructure will support an estimated demand of around 1 GW of electricity for the AI campus. However, each transmission line is engineered to accommodate approximately 1.3 GW, providing significant capacity margins for long-term operational stability.
In terms of electricity procurement, the project will adopt a non-traditional approach by relying heavily on long-term power purchase agreements (PPAs) rather than direct engagement with Croatia’s wholesale electricity market. An initial agreement has already been established with Greenvolt, with plans for additional supply from various renewable energy developers.
The energy sources earmarked for this initiative include solar, wind, geothermal, and hydropower, along with future battery storage systems aimed at enhancing flexibility and grid balancing. Developers anticipate that the AI campus will ultimately require around 2 GW of renewable generation capacity to fulfill its annual electricity needs.
Furthermore, stakeholders assert that this project could bolster Croatia’s overall electricity system by facilitating the integration of over 5 GW of additional renewable projects currently under development. Concerns regarding potential electricity shortages or market price distortions have been addressed by project officials, who emphasize expected growth in domestic power generation capacity in the forthcoming years.
