Shanghai Subsea Data Center Enters Full Commercial Operation as Offshore Models Advance in Asia
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A subsea data center off the coast of Shanghai has entered full commercial operation, using offshore wind power and seawater cooling. In parallel, a floating containerized data-center trial is under way in Yokohama, while Keppel has started building a four-storey offshore facility in Singapore.
- The Shanghai subsea project has entered full commercial operation, while Yokohama remains in trial and Keppel’s Singapore facility is under construction.
- The Shanghai project reportedly required US$226 million in total investment and claims at least 30% lower energy consumption than a conventional data center.
- Yokohama’s floating, containerized data-center trial is scheduled to run through March 2027.
- Keppel’s four-storey offshore data center in Singapore is planned to begin commercial operation in 2028.
- Maintenance logistics and marine thermal-discharge impacts remain central barriers to scaling offshore and subsea facilities.
The Shanghai project marks a commercial deployment of subsea data-center infrastructure rather than a pilot. The project, which uses offshore wind generation and seawater cooling, entered full commercial operation this spring. Total project investment was reported at US$226 million.
According to the source article, the Shanghai facility’s energy consumption is at least 30% lower than that of a conventional data center. The comparison methodology, the project’s operator, capacity and exact commercial-operation date were not disclosed, so the claimed reduction cannot be assessed against a defined baseline.
Elsewhere in Asia, marine data-center concepts remain at earlier stages. A containerized data center on a floating platform in Yokohama has been under trial since March. The platform incorporates solar panels and batteries, and the trial is scheduled to continue through March 2027. In Singapore, Keppel has started construction of a four-storey offshore data center, with commercial operation planned for 2028.
The projects illustrate a potential specialist segment in which compute infrastructure is integrated with cooling and on-site or adjacent generation and storage. For operators facing constrained terrestrial sites or limited freshwater availability, marine deployment could provide an alternative siting model. The commercial launch in China, alongside a Japanese trial and Singapore construction project, suggests that the model is being tested across several Asian markets.
The operating constraints remain significant. Servicing a subsea installation can be difficult: repairing a single computer may require the entire unit to be lifted to the surface. Thermal discharge is also an environmental consideration. At SIN01 in Sines, Portugal, seawater used for server cooling is returned to the ocean at approximately 1°C above its intake temperature; the article notes that heated discharge can affect oxygen conditions, acidity/alkalinity and marine ecosystems, although it provides no project-specific environmental assessment.
Microsoft ended its subsea data-center research project in 2024 and said it would not build new subsea data centers. The article reports that server failure rates in Microsoft’s subsea installation were about one-eighth of those in land-based data centers, but does not establish why Microsoft ended the program; suggested regulatory and service-related factors are presented as speculation rather than confirmed reasons.
Marine siting could offer an alternative where land availability, freshwater for cooling or power supply are constrained, particularly when paired with local offshore wind or solar generation. However, maintenance access and the environmental effects of warmed seawater discharge remain material constraints on wider deployment.
- — / 24 сентября 2026 г. · ЯпонскийПервоисточник →
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