Location
Saudi Arabia / Middle East
Project record
Rabigh 4 IWP intake, outfall and storage system
SEPCOIII reports that Rabigh 4 completed its EPC performance test on 19 February 2026 at the plant's 600,000 m3/day design capacity. The disclosed test power use was 2.712 kWh/m3, or 2.659 kWh/m3 after photovoltaic generation. Modern Marine's project record identifies a 1,500,000 m3/day seawater intake and a 900,000 m3/day outfall, making the marine system a defined part of the delivery chain rather than an assumed coastal interface.
Segment
Marine utilities
Status
EPC performance test completed on 19 February 2026; SWPC commercial-operation confirmation remains unpublished / Confirmed
Last checked
14 August 2026
Coverage
Related sectors
Marine utilities is the primary work classification. Related sectors connect this record to adjacent marine delivery and market coverage.
Subject index
Related subjects
These subject pages bring together related projects, technical articles, reports, and evidence methods.
Project anatomy
Contract scope and delivery roles
- Client / authority
- Saudi Water Partnership Company (SWPC)
- Delivery parties
- Rawabi Water Desalination Company (project company), ACWA Power, Haji Abdullah Alireza & Co. and Al Moayyed Contracting Group (shareholders), PowerChina, SEPCOIII and WETICO (EPC consortium), Modern Marine (marine works contractor)
- Contract route
- Build-own-operate independent water project under a 25-year water purchase agreement. ACWA reports a USD 675 million investment cost and ownership shares of 45% ACWA Power, 35% Haji Abdullah Alireza & Co. and 20% Al Moayyed Contracting Group.
- Execution window
- SWPC named the preferred bidder on 26 February 2023 and signed the project agreements on 12 April 2023. ACWA records financial close in September 2023 and scheduled Q1 2026 commissioning. SEPCOIII then reported completion of the EPC performance test on 19 February 2026. SWPC has not published a commercial-operation notice after that test.
- Works package
- A 600,000 m3/day seawater reverse-osmosis plant, 1,200,000 m3 of potable-water storage, electrical connection works and a 6.804 MWp photovoltaic system. The project-specific marine record gives a 1,500,000 m3/day intake flow and a 900,000 m3/day outfall flow.
- Marine interfaces
- The plant depends on a high-volume Red Sea abstraction and brine-return system. The evidenced interface runs from offshore intake through shoreline and treatment hydraulics to the outfall, while final as-built geometry, diffuser details, marine acceptance and operating environmental results remain unpublished.
- Commercial evidence boundary
- Performance testing has moved the project past the greenfield EPC market. Near-term demand now centres on commissioning support, marine inspection, condition baselining, intake and diffuser maintenance, environmental monitoring and operating optimisation.
Project timeline
Material developments
Dated events that changed scope, counterparties, delivery, commissioning or operating status.
Open this project in the Change LogThe EPC consortium completed the performance test
SEPCOIII reported full design-capacity testing and measured power consumption. The notice does not establish SWPC commercial acceptance, final marine handover or sustained operating performance.
SourceSWPC named the preferred bidder
The preferred-bidder notice confirmed the 600,000 m3/day plant and 1,200,000 m3 storage scope. It was a procurement milestone, not a construction or operating result.
SourceEvidence gap
What remains unverified
Outstanding evidence
- Commercial-operation certificate or owner acceptance from SWPC or the project company
- Final intake and outfall completion, testing and marine handover
- As-built intake and outfall alignments, lengths, materials and diffuser configuration
- Brine-dispersion and receiving-water monitoring under sustained operation
- Acceptance and operating availability of the 1,200,000 m3 storage system
- Sustained plant output and power consumption after the EPC test period
Sources and related records
Read featured analysis Methodology Submit a correction Project tracker
Source collections
Project sources 7
- Rabigh 4 IWP project profile ACWA Power, Current profile reviewed 14 August 2026
- Rabigh 4 EPC contract awarded to PowerChina, SEPCOIII and WETICO ACWA Power, 14 July 2023
- Rabigh 4 IWP EPC project performance test completed SEPCOIII / PowerChina, 21 February 2026
- Preferred and reserved bidders for Rabigh 4 IWP Saudi Water Partnership Company, 26 February 2023
- SWPC seven-year statement 2024-2030 Saudi Water Partnership Company, September 2024
- SWPC profile and project portfolio Saudi Water Partnership Company, February 2026
- Rabigh 4 IWP marine works project record Modern Marine, Current project page reviewed 20 July 2026