https://spectrum.ieee.org/pumped-water-energy-storage [ ] IEEE.orgIEEE Xplore Digital LibraryIEEE StandardsMore Sites Sign InJoin IEEE Desalination Can Beat Out Batteries for Excess Energy Share FOR THE TECHNOLOGY INSIDER Search: [ ] Explore by topic AerospaceArtificial IntelligenceBiomedicalClimate TechComputing Consumer ElectronicsEnergyHistory of TechnologyRoboticsSemiconductors TelecommunicationsTransportation IEEE Spectrum FOR THE TECHNOLOGY INSIDER Topics AerospaceArtificial IntelligenceBiomedicalClimate TechComputing Consumer ElectronicsEnergyHistory of TechnologyRoboticsSemiconductors TelecommunicationsTransportation Sections FeaturesNewsOpinionCareersDIYEngineering Resources More NewslettersPodcastsSpecial ReportsCollectionsExplainersTop Programming LanguagesRobots Guide /IEEE Job Site / For IEEE Members Current IssueMagazine ArchiveThe InstituteThe Institute Archive For IEEE Members Current IssueMagazine ArchiveThe InstituteThe Institute Archive IEEE Spectrum About UsContact UsReprints & Permissions /Advertising / Follow IEEE Spectrum Support IEEE Spectrum IEEE Spectrum is the flagship publication of the IEEE -- the world's largest professional organization devoted to engineering and applied sciences. 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Learn more - CREATE AN ACCOUNTSIGN IN JOIN IEEESIGN IN Close Access Thousands of Articles -- Completely Free Create an account and get exclusive content and features: Save articles, download collections, and talk to tech insiders -- all free! For full access and benefits, join IEEE as a paying member. CREATE AN ACCOUNTSIGN IN EnergyTopicTypeNewsClimate Tech Desalination Can Beat Out Batteries for Excess Energy Producing water could be more efficient than storing energy for later Michelle Hampson 04 Dec 2023 2 min read dots connected together in the shape of a water drop with a lightning bolt in the center against a dark blue background iStock renewable energywater desalinationbatteriesjournal watchclimate tech This article is part of our exclusive IEEE Journal Watch series in partnership with IEEE Xplore. In many arid regions around the world, desalination of saltwater is an important means to acquire drinking water. One of the most common desalination techniques is through a process called reverse osmosis. However, the pumps used for reverse osmosis desalination require immense amounts of electricity--which raises questions on how to ensure this process is completed in an economical and energy-efficient way. New research shows that hybrid energy grids that rely on a mix of renewable and fossil fuel energy are up to the task, so long as the timing of freshwater production is right. In some situations, it may even be more financially and energy efficient to put that generated energy toward desalination rather than store it in batteries for use later. Money can be saved by only producing freshwater when renewable energy production is high. The results are described in a study published 5 October in the Journal of Modern Power Systems and Clean Energy. "If a significant percentage of the electricity demand in a power system is due to freshwater production, it is appropriate to coordinate the operations of the freshwater system and the power system as they are linked, and such coordination may result in economic savings and reduced unserved power and water demand," explains Antonio Conejo, a professor of engineering at Ohio State University. Conejo's Ph.D. student, Mubarak Almubarak, is from Kuwait and was interested in assessing the energy-grid demands of different scenarios in the Middle East--for example, in a situation where demand for desalination is high and renewable-energy production is still low. In comparison, arid places like California or Texas may still have desalination plants, but a higher portion of their energy comes from renewable sources. Their analysis suggests mixed renewable systems like those in California or Texas would see the greatest economic benefit in terms of coordinated desalination times, focused on times when renewable energy is peaking--for example, at noon on a sunny day, when solar power production is highest and costs are lowest. However, this economic efficiency "mostly vanishes" under scenarios with 100 percent renewable grids, says Conejo, because the cost of producing electricity is similar throughout the day. Nevertheless, he notes that this approach, whereby the production of freshwater is appropriately timed throughout the day based on energy production, could still be useful for regions that are ramping up their use of renewable sources and are at the hybrid stage of production. "[Because] freshwater tanks are cheaper than electrical batteries, it seems appropriate to fully exploit the ability of tanks to displace energy production/consumption, and then, if needed, to use electrical batteries for the same purpose," Conejo says. This post was updated on 5 December to clarify that the authors examined the difference between storing excess energy production in batteries for later use on the grid versus using excess production for desalination. From Your Site Articles * Gravity Energy Storage Will Show Its Potential in 2021 > * 4 New Ways to Store Renewable Energy With Water > * A Pumped Hydro Energy-Storage Renaissance > Related Articles Around the Web * How Pumped Storage Hydropower Works | Department of Energy > renewable energywater desalinationbatteriesjournal watchclimate tech Michelle Hampson Michelle Hampson is a freelance writer based in Halifax. She frequently contributes to Spectrum's Journal Watch coverage, which highlights newsworthy studies published in IEEE journals. The Conversation (2) Gerard Robinson Gerard Robinson07 Dec, 2023 M There's also the possibility to use green hydrogen to produce desalinated water. In other words, a full cycle of solar/wind/wave/ tidal energy being used to produce green hydrogen some of which is then later used to produce electricity through a fuel cell or combustion, capturing the resultant steam to become potable water. 0 Replies Hide replies Show More Replies Stuart Lew Stuart Lew06 Dec, 2023 INDV Entirely logical method to expend energy when energy demand is low and the grid has too many inputs feeding into it. 0 Replies Hide replies Show More Replies An illustration showing young people sitting with computers. Behind and over them are icons representing AI and education topics. 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