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The deployment sits within Hainan’s free-trade zone, where China has relaxed regulations to allow full foreign ownership of data center and telecom operations. The project supports Hainan’s push to become a maritime and tech innovation hub, integrating marine science, digital services, and offshore infrastructure.
China’s Hainan underwater data center is a monumental experiment—one embedded with technological ambition, sustainability goals, and geopolitical strategy. While challenges abound—from marine maintenance to cost structures—the potential upside in cooling efficiency, infrastructure scalability, and carbon reduction is profound.
It is regarded as a special area for China to comprehensively deepen economic reform and experiment with the highest level of opening-up policies. Hainan Free Trade Port is not a seaport in the usual sense, but the entire Hainan Island is regarded as a special economic development area.
The "Notice on Preferential Corporate Income Tax Policies for Hainan Free Trade Port" proposed that enterprises in encouraged industries registered and operated in Hainan Free Trade Port shall be subject to a reduced corporate income tax rate of 15%.
These systems are designed with undersized energy storage system capacities due to the prohibitive mass of a fully redundant system [, ]. With a 50 kW-class solar array and electric propulsion system, even an undersized system represents capacity in the highest ranges of space heritage [43, 210].
Short-term storage that lasts just a few minutes will ensure a solar plant operates smoothly during output fluctuations due to passing clouds, while longer-term storage can help provide supply over days or weeks when solar energy production is low or during a major weather event, for example.
Compared to their terrestrial counterparts, space energy storage systems must be able to withstand severe radiation, extreme cycling, intensive temperature fluctuations, and vacuum pressures; all within incredibly stringent specific energy and energy density parameters.
Energy storage systems for space applications have been critically reviewed and comprehensively assessed. Batteries, regenerative fuel cells, flywheels, capacitors, and thermal systems have been evaluated in the context of a space application framework.
