Seawater desalination plants Market Outlook 2026–2036: Growth Drivers, Key Companies, Strategic Developments & Adoption Forecast — A Meticulous Next™ Foresight Brief

This Meticulous Next™ brief examines seawater desalination plants, meaning the reverse osmosis and thermal plants that turn seawater into municipal and industrial supply. It tests whether falling energy use per cubic metre and long-term purchase contracts make desalination a standard part of water supply in dry coastal regions, and which developers, equipment suppliers and utilities gain.

Financing is moving at scale in the Gulf. Saudi Arabia reached financial close in December 2025 on the Ras Mohaisen plant, with capacity of 300,000 cubic metres per day and project cost of SAR 2.07 billion, after the Saudi Water Authority announced SAR 2.43 billion of financing for plants at Jubail and Al Khobar in June 2025. The conclusion is that lenders accept the water purchase agreement model for large reverse osmosis plants, which keeps the pipeline funded.

Contracting is spreading beyond the established buyers. Dubai Electricity and Water Authority signed a water purchase agreement in October 2026 for the second phase of the Hassyan seawater reverse osmosis plant, at about 272,000 cubic metres per day and investment of about USD 478 million, and Azerbaijan agreed a public private partnership of USD 400 million in December 2025. The conclusion is that new buyers on the Caspian and in the Gulf are adopting the same contract structure, widening the base of projects.

Energy is the cost that decides tariffs. Seawater reverse osmosis uses a fraction of the energy of thermal processes, which is why new capacity is overwhelmingly membrane based and older thermal plants are candidates for replacement. The conclusion is that suppliers of low-energy membranes, pumps and energy recovery gain share, while brine discharge rules become the main limit on where plants can be sited.

The brief treats seawater desalination plants as an accelerating signal with a ten year horizon to 2036. It identifies which regions, technologies and companies move first and what each means for utilities, governments, developers and suppliers. It is a focused 109-page decision brief that presents an indicative trajectory rather than a segmented market model.

Seawater reverse osmosis pushes seawater through membranes at high pressure to separate salt, while thermal processes evaporate and condense it using heat. Reverse osmosis dominates new capacity because it uses far less energy per cubic metre.

Energy use is the central measure. Modern reverse osmosis plants operate at roughly three to four kilowatt hours per cubic metre, and thermal plants use several times more, so replacement of thermal capacity lowers both cost and emissions.

Plants depend on intakes and pretreatment, membranes, high-pressure pumps, energy recovery devices and brine management. Energy recovery returns pressure from the reject stream to the feed, and brine must be diluted or discharged within environmental limits.

Uses are municipal supply, industrial water for power and manufacturing, and drought reserve capacity for coastal cities.

The limits are brine discharge, energy cost, concentration of demand in a few countries and project delays from permitting. The period turns on whether plants can be paired with renewable power and whether brine rules allow coastal siting.

The seawater desalination plants market, covering design, construction, equipment and membranes, and long-term operation of seawater reverse osmosis and thermal desalination plants for municipal and industrial supply, and excluding brackish water treatment, wastewater reuse and water distribution networks, is valued at USD 20–28 billion in 2026 and is projected to reach USD 39.34–55.08 billion by 2036, at a CAGR of 7%.

The 2026 base rests on spending on new plant construction, membranes and equipment, and operation under long-term water purchase agreements, led by Saudi Arabia, the United Arab Emirates, other Gulf states, North Africa, Israel, Australia and the United States. Growth then follows the award pipeline, replacement of thermal plants and new buyers in Central Asia and Africa.

The forecast is sensitive to electricity prices, lender appetite, award timing and brine rules. Regionally, the Middle East and North Africa hold the largest base, followed by Asia Pacific and North America.

The base case assumes lenders keep financing purchase agreement projects, energy use per cubic metre keeps falling and brine rules stay workable, bringing the inflection to about 2030. An accelerated case assumes severe drought and cheaper renewable power, bringing the inflection to 2028 and lifting the 2036 value to the top of the range. A delayed case assumes higher interest rates and stricter brine rules that slow awards, moving the inflection to 2033 and holding growth at the bottom of the range.

Growth drivers

• Water scarcity in the Gulf and North Africa.
• Population and industrial demand.
• Government water security programmes.
• Falling cost of reverse osmosis.

Enablers

• Long-term water purchase agreements.
• Bank and development bank finance.
• Energy recovery devices and low-energy membranes.
• Renewable power supply.

Restraints and barriers

• Brine discharge.
• Energy cost.
• Project delays from permitting and environmental review.
• Concentration of demand in a few countries.

The direction of seawater desalination plants is set by water scarcity in dry coastal regions, conversion of thermal plants to reverse osmosis, long-term water purchase agreements, development bank and bank financing, and scrutiny of brine and marine impact.

The key participants in seawater desalination plants include ACWA Power Company, Veolia Environnement S.A., Acciona, S.A., IDE Technologies Ltd., Doosan Enerbility Co., Ltd., Sembcorp Industries Ltd, Metito Holdings Limited, Aquatech International LLC, Toray Industries, Inc., Nitto Denko Corporation, DuPont de Nemours, Inc., Xylem Inc., Energy Recovery, Inc., Danfoss A/S, Sulzer Ltd, Saudi Water Authority, Saudi Water Partnership Company, Dubai Electricity and Water Authority, King Abdullah University of Science and Technology, Asian Infrastructure Investment Bank, Webuild S.p.A., Marubeni Corporation, Sumitomo Corporation, Abengoa S.A., Hitachi Zosen Corporation, Mitsubishi Heavy Industries, Ltd., Hyundai Engineering & Construction Co., Ltd., Black & Veatch Holding Company, AtkinsRéalis Group Inc., Worley Limited, Pentair plc, Grundfos Holding A/S, Kuraray Co., Ltd., LG Chem Ltd., Saline Water Conversion Corporation, Emirates Water and Electricity Company, Abu Dhabi Future Energy Company PJSC, Ministry of Environment, Water and Agriculture of Saudi Arabia, Office National de l'Électricité et de l'Eau Potable, Algerian Energy Company SPA, Egyptian Holding Company for Water and Wastewater, Azersu OJSC, San Diego County Water Authority, Orange County Water District, Poseidon Water, Water Corporation of Western Australia, Sydney Water Corporation, Chennai Metropolitan Water Supply and Sewerage Board, Japan Bank for International Cooperation, European Investment Bank, Islamic Development Bank and International Desalination Association.

The brief profiles representative participants in each archetype and assesses which are positioned to lead as purchase agreements turn into operating plants.

ACWA Power leads among developers in the Gulf, IDE Technologies and Acciona lead among plant builders and operators in several regions, and Toray, Nitto Denko and DuPont lead among membrane suppliers. Competitive intensity is high in tendering, where tariffs are bid down, and moderate in membranes and energy recovery, where suppliers compete on energy use and lifetime.

Where value migrates.

In 2026 value sits with developers and engineering groups that win large awards and build plants. By 2031 it moves toward suppliers of low-energy membranes and energy recovery and toward operators that manage brine and renewable power. By 2036 it settles with integrated water and energy service providers operating under long contracts. Margins hold for firms with proven energy performance and narrow for bidders competing on tariff alone.

The signals converge on financing momentum and energy efficiency. Financial close on a large Saudi plant, a Dubai purchase agreement and a Caspian partnership within one year support growth, while brine discharge, concentration of demand in a few countries and permitting delays limit the pace.

Structural limits show where progress could slow: electricity cost, lender appetite, award timing and marine impact. The brief therefore tracks four indicators: capacity awarded, energy use per cubic metre, financial closes and brine discharge rules.

Reverse osmosis awards in the Gulf first, then replacement of thermal capacity, then renewable-powered plants in new regions are the expected order of adoption.