Submer Barcelona AI data center

Project brief

What is publicly known

Status: planned. Submer's February 2025 announcement says the company is developing a 56 megawatt data center in Barcelona that it intends to own and operate. The same release launched new design, construction, operations, and artificial-intelligence-as-a-service business units.

It presents Barcelona as the first phase of a wider European program. This is useful evidence of strategy and design intent, but it is not a construction notice or an operating record. What is known is the proposed performance envelope.

Submer says the site would support at least 150 kilowatts per rack or immersion tank. It also says the facility would use liquid cooling and consume no water in normal operation. The company names direct liquid cooling and immersion as capabilities, but it does not allocate the 56 megawatts between them or identify server, plant, or heat-rejection equipment.

Cooling matters here because a dense Barcelona site must carry peak summer conditions while meeting the claimed water target. A closed loop can avoid routine water consumption, but it still needs a credible way to reject heat on hot days. The announcement does not disclose that design, its energy use, or the conditions behind the zero-water claim.

Also unknown are the site address, land and grid rights, planning approval, financing, construction partner, customer commitments, opening date, and staged capacity. We would change the status to deploying when permits, site work, utility agreements, financing, or equipment orders are independently visible. An operator commissioning notice and measured rack, energy, and water data would support operating status.

If later filings reduce the capacity or change the ownership model, this record should follow those harder facts rather than the original headline.

Status is labeled from public evidence. Supplier orders, MoUs, pilots, projects under delivery, and operating sites are not counted as equivalent.