Artificial Intelligence
Sovereign-grade AI compute infrastructure, headquartered in Switzerland with operations across Europe and the United States.
EXPLORE CASTELLAN INTELLIGENCETHE CASE FOR SOVEREIGN AI
AI Compute Is the Most Consequential Infrastructure of the Century
The Shift
AI infrastructure is becoming a strategic resource. Today, +85% of the world's compute capacity is concentrated among a small number of U.S. hyperscalers, creating growing dependencies for governments and enterprises.
The Exposure
As AI adoption accelerates, organizations need greater control over where their data is processed and under which jurisdiction their AI workloads operate. Digital sovereignty has become a critical business and geopolitical requirement.
The Answer
Castellan provides sovereign AI infrastructure designed for organizations that require security, compliance and operational control. With European roots and neutral operations, the company enables trusted AI deployment while meeting demanding regulatory and enterprise requirements.
SERVICES
From Powered Land to Sovereign Compute
Seven services cover the full path and options to compute. Secure powered land, commission a project-managed build-out, lease a tenant-ready campus, or contract GPU capacity directly.
Powered Land
Land secured on long-term tenure, with grid interconnection and access to power, the scarcest input in AI. For operators who want to build on their own terms.
Infrastructure
From design to ready-for-rack. Electrical, cooling, and construction planned, managed, and delivered end-to-end. We run the project, you own the result.
Powered Shell
Land, power, and built infrastructure delivered tenant-ready on a long-tenor triple-net lease. Our core offering: everything in one, fast time-to-power.
HPC Hardware Procurement
Blackwell-class GPU systems, networking fabric, and storage, sourced through established OEM and distribution relationships. Pure GPU trading, from single cards to complete, integrated racks, with allocation access, price discipline, and delivery logistics handled end-to-end.
AI Compute Services
Bare-metal GPU clusters and reserved capacity blocks under Swiss and European jurisdiction, for training, fine-tuning, and inference. Compute you can contract, without building anything.
Compute Monetization
Your AI hardware runs below capacity? Castellan brings contracted offtakers and turns idle GPU-hours into revenue, for fleets, data-centre capacity, power, and sites.
HPC Hosting
Colocation in data centres across Europe and beyond, high-density racks for H100 to GB300 systems, DLC-ready cooling, 24/7 operations and remote hands. Your machines, our uptime, with optional monetization of idle time.
Let's Build Together
Whether a prospective tenant, a land or construction partner, or an institution interested in the build-out, every enquiry reaches the Castellan team and is routed to the right person.