Desalination Capacity in Saudi Arabia

Desalination Capacity in Saudi Arabia: Engineering Water Security

Saudi Arabia is the world’s largest producer of desalinated water, operating a desalination network that produces over 7.5 million cubic metres per day and accounts for approximately 22 per cent of global desalination capacity. This infrastructure, central to Vision 2030 planning, is not a luxury but an existential necessity; the Kingdom receives less than 100 millimetres of annual rainfall, has no permanent rivers, and depends on desalinated seawater for the majority of its municipal and industrial water supply. The desalination sector represents a critical pillar of national infrastructure and a significant market for water technology and investment.

Infrastructure Overview

The Saudi Water Authority (SWA), formerly the Saline Water Conversion Corporation (SWCC), operates the majority of government-owned desalination plants across both the Red Sea and Arabian Gulf coasts. Major facilities include the Ras Al Khair plant, one of the world’s largest, with combined desalination and power generation capacity; the Shoaiba plant on the Red Sea coast serving Jeddah and Makkah; and the Jubail plants serving the Eastern Province and Riyadh via long-distance pipeline transmission.

The Kingdom’s desalination infrastructure connects to an extensive transmission and distribution network. The most strategically significant pipeline system delivers desalinated water from Gulf coast plants to Riyadh, traversing approximately 480 kilometres across the desert. This east-west water transmission corridor represents critical national infrastructure, and its capacity is being expanded to accommodate Riyadh’s rapid population growth.

Technology Landscape

Saudi Arabia’s desalination fleet employs both thermal and membrane technologies. Multi-stage flash (MSF) distillation and multi-effect distillation (MED) plants dominate the existing thermal fleet, particularly at older facilities co-located with power plants for combined water and electricity production. Reverse osmosis (RO) technology has been adopted for all recent large-scale additions, offering lower energy consumption and reduced capital costs per unit of water produced.

The shift towards reverse osmosis is driven by energy efficiency imperatives and declining membrane costs. Modern RO plants in Saudi Arabia achieve energy consumption rates below 3.5 kilowatt-hours per cubic metre, roughly half the energy requirement of thermal alternatives. This efficiency gain is particularly significant given the Kingdom’s objective to reduce domestic energy consumption for non-export purposes.

Capacity Expansion

The Kingdom’s desalination capacity expansion programme includes several major independent water producer (IWP) projects procured through competitive public-private partnership frameworks. The Jubail 3A IWP, with capacity of 600,000 cubic metres per day, and the Rabigh 4 IWP are among recent additions. Additional projects are in various stages of procurement and development to meet growing urban demand.

ACWA Power, the Kingdom’s largest private water desalination developer, participates in multiple Saudi desalination projects and ranks among the world’s leading desalination companies. International developers including Engie, Veolia, and various Asian water companies compete in Saudi desalination tenders, ensuring competitive pricing and technology transfer.

Privatisation and Corporatisation

The Saudi water sector has undergone significant privatisation and corporatisation. Independent water producer projects transfer development, financing, and operational risk to private consortiums under long-term water purchase agreements. The National Water Company (NWC) manages urban water distribution and wastewater collection, operating as a corporatised entity with performance targets for service quality, network efficiency, and non-revenue water reduction.

The Water Transmission and Technologies Company (Tamasuk), a newly established entity, manages strategic water transmission infrastructure, including the critical pipeline networks connecting coastal desalination plants to inland population centres.

Energy-Water Nexus

The interdependence of energy and water production is a defining characteristic of Saudi Arabia’s infrastructure landscape. Desalination consumes approximately 25 per cent of the Kingdom’s domestic energy production. Transitioning desalination to renewable energy sources, particularly solar, would simultaneously reduce carbon emissions and free hydrocarbons for export. Pilot projects integrating solar power with reverse osmosis desalination are being developed, with potential for scaled deployment.

Outlook

Saudi Arabia’s desalination capacity will continue to expand to meet the demands of a growing, urbanising population and an expanding industrial base. Technology evolution towards more energy-efficient reverse osmosis, integration with renewable energy, and innovative approaches including floating desalination and modular systems present opportunities for technology providers and investors. The Kingdom’s position as the global leader in desalination ensures that Saudi Arabia will remain at the forefront of water technology deployment and innovation.