U.S. OceanWell Develops Deep-Sea Desalination Technology, Reducing Energy Consumption by Approximately 40%

en.Wedoany.com Reported - U.S. company OceanWell is developing a subsea desalination system that utilizes natural ocean pressure at depths exceeding 400 meters to drive reverse osmosis, potentially reducing energy consumption by about 40% compared to traditional desalination methods. This technology has advanced to the semifinals of the $119 million XPRIZE Water Scarcity competition. The company recently demonstrated the working principle of its modular subsea pods.

Traditional desalination plants require pumping seawater ashore and forcing it through high-pressure membranes. In contrast, OceanWell's modular subsea pods are deployed at depths exceeding 400 meters (1,300 feet) below sea level, utilizing natural pressure for desalination. Freshwater is transported to shore, while the remaining brine is returned to the sea to reduce environmental impact and avoid the construction of large coastal facilities. Each pod can produce up to 1 million gallons of freshwater per day, and multiple pods can be combined to form "water farms."

OceanWell has completed a successful pilot project in collaboration with the Las Virgenes Municipal Water District in Southern California. The company is currently working with 25 California water agencies to build "Water Farm 1," a project planned off the coast near Malibu, California, expected to begin providing 50 to 60 million gallons of drinking water per day around 2030. OceanWell is also researching different ways to power the offshore system, including connecting to onshore electricity or utilizing future offshore wind power.

Recent progress also includes: signing a memorandum of understanding with French company Eau d'Azur to assess deployment opportunities in the Mediterranean; and receiving support from Kubota Corporation, the European Water Tech Accelerator, and Boston Consulting Group's Social Impact Accelerator. Its modular subsea design aims to address long-standing challenges faced by traditional desalination, such as high energy consumption, brine discharge, large coastal infrastructure, and impacts on marine ecosystems, providing a scalable and climate-resilient freshwater source for water-scarce regions.

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