Floating data centers cruise a bit closer after a major show of support from Japanese giant Hitachi

• Floating data centers move closer as Hitachi backs ship conversion plan
• Japan explores offshore computing to bypass land shortages and infrastructure limits
• Seawater cooling offers efficiency gains while introducing new engineering complications

A floating data center project in Japan has gained significant backing from Hitachi, bringing a ship-based computing concept closer to possible deployment.

The company and its subsidiary Hitachi Systems signed a memorandum with shipping firm Mitsui OSK Lines to develop and operate the facility.

The agreement covers the conversion of a second-hand vessel into a working data center, with operations tentatively expected from 2027 onward.

Why Japan is looking to the water for server farms

Hitachi will contribute its experience from operating land-based facilities in Japan and deploying containerized data systems in overseas markets.

Demand for data center capacity continues to increase as artificial intelligence systems require more computing power and supporting infrastructure.

This demand creates pressure to identify locations that can support cooling, energy supply, and long-term operational stability.

Japan faces land constraints, particularly around Tokyo and Osaka, where most existing data campuses remain concentrated, and the floating concept offers an alternative, reducing construction timelines, meaning ship conversion could potentially be completed in about one year.

Conventional data centers often require several years to design, approve, and construct under current regulatory conditions.

Earlier plans referenced converting a 120-meter, 9,731-ton vessel, although attention has shifted toward repurposing a car carrier instead, as such vessels provide large internal cargo areas that can accommodate server installations and associated infrastructure.

A capacity of roughly 54,000 square meters would place the facility near the scale of large terrestrial data centers.

Cooling would rely on seawater or river water, reducing dependence on freshwater sources that are increasingly constrained, although this approach introduces different engineering requirements, particularly around corrosion control, filtration, and thermal exchange efficiency.

Mitsui OSK Lines is also examining how it can reuse existing onboard systems during conversion, including air conditioning, water intake, and power generation infrastructure already integrated into the vessel.

Reusing these systems may reduce upfront costs, although the extent of savings remains unclear without detailed disclosures.

Hitachi and Hitachi Systems will oversee IT infrastructure design, installation, and operational management, and will also engage customers and define technical requirements for deploying workloads on the platform.

Mitsui OSK Lines will manage vessel conversion, coordinate with port authorities, and handle maritime logistics and maintenance.

The arrangement reflects a division between digital infrastructure expertise and maritime operational control.

Via The Register

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