Project record

Taweelah RO desalination intake and outfall system

Operating membrane and high-pressure pump hall inside the Taweelah RO desalination plant in Abu Dhabi

ACWA

Taweelah RO is an operating 200 MIGD seawater reverse-osmosis plant at Abu Dhabi's Al Taweelah complex. ACWA lists Q1 2024 as the commercial-operations date. Its environmental appendices also preserve the bid-stage marine design trail: proposed intake and outfall layouts, a 27.8 m3/s intake case and a 17.3 m3/s discharge case used for brine modelling. Those layouts establish a physical marine system at design stage, but the published material does not identify the final as-built alignment, marine contractor split, completion surveys or accepted hydraulic and environmental test results.

Project signal

Completed in UAE

Treat the plant as an operating desalination asset with a confirmed marine intake and brine-discharge function. Keep the bid-stage layouts in their original design context. They support marine-system screening and operating-interface analysis, but they do not establish final pipe geometry, construction quantities, contractor performance or acceptance of the completed works.

Current status ACWA lists commercial operations from Q1 2024; the 200 MIGD plant is operating, while final as-built intake and outfall geometry is not publicly disclosed Source confidence Confirmed

Location

UAE / Middle East

Segment

Marine utilities

Status

ACWA lists commercial operations from Q1 2024; the 200 MIGD plant is operating, while final as-built intake and outfall geometry is not publicly disclosed / Confirmed

Evidence reviewed

19 July 2026

Controlled taxonomy

Related sectors

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Knowledge context

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Project anatomy

Scope, counterparties, and execution logic

Client / authority
Taweelah RO Desalination Company; Emirates Water and Electricity Company as water offtaker
Delivery parties
SEPCOIII Electric Power Construction Co., Ltd and Abengoa Agua S.A. (EPC consortium), Acwa Operations Taweelah Water Desalination Services LLC (operations and maintenance)
Contract route
Build-own-operate independent water project under a 30-year water purchase agreement. ACWA holds 40% of the project company, with Mubadala and TAQA identified as the other investors on ACWA's current profile.
Execution window
The water purchase agreement was signed in 2019. ACWA's later corporate disclosures place first-phase operation in June 2022, a Group 2 commercial-operation certificate in the first half of 2023, and commercial operations for the 200 MIGD project in Q1 2024.
Works package
A USD 874 million, 200 MIGD seawater reverse-osmosis plant producing approximately 909,201 m3/day, with seawater abstraction, pretreatment, reverse osmosis, post-treatment, potable-water export and brine discharge. The bid-stage appendices modelled a proposed intake and outfall pipeline arrangement at 27.8 m3/s intake and 17.3 m3/s discharge.
Marine interfaces
The physical marine boundary runs from the seawater intake through the shoreline and plant hydraulic system to the brine outfall and receiving water. Bid-stage alternatives considered intake-channel and pipeline arrangements, construction dredging or trenching, pipeline laying, intake structures and coastal protection. Final installed geometry and quantities are absent from the published operating material.
Commercial read
The open market is no longer a greenfield EPC opportunity. It sits in inspection, condition assessment, diffuser and pipeline maintenance, hydraulic troubleshooting, brine-plume monitoring, asset-life planning and any future capacity or shared-infrastructure change. Bid-stage drawings can orient that work but cannot replace current owner asset data.
Next milestone
Seek owner, operator or regulator publication of as-built marine drawings, completion and acceptance records, current discharge permit conditions, plume-monitoring results, condition surveys and any maintenance or modification package for the intake and outfall assets.

Material change register

What changed, when, and what it proves

Only source-bound events that alter phase, scope, counterparties, delivery, completion, commissioning, or acceptance are listed. A change can advance the record without proving the next gate.

ACWA places commercial operations in Q1 2024

The current project profile classifies the full 200 MIGD plant as commercially operating. That closes the project-level delivery phase but does not publish the final intake and outfall alignment or marine acceptance results.

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Group 2 received its commercial-operation certificate

ACWA's first-half 2023 results state that EWEC issued the Group 2 certificate and that the plant was supplying 183 MIGD. The remaining step to the current 200 MIGD operating position followed later.

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First desalination phase entered operation

ACWA's rights-issue chronology places first-phase water production in June 2022. This was an operating milestone for part of the scheme, not full-capacity completion of the 200 MIGD facility.

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Water purchase agreement established the IWP

ACWA's project archive records the 30-year agreement for the 909,200 m3/day scheme. Award and offtake created the delivery structure before marine construction and operating acceptance.

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Delivery watch

Evidence needed next

Seek owner, operator or regulator publication of as-built marine drawings, completion and acceptance records, current discharge permit conditions, plume-monitoring results, condition surveys and any maintenance or modification package for the intake and outfall assets.

Decision watchpoints

  • Final as-built intake, outfall and shoreline-crossing drawings
  • Marine contractor allocation, installation method and construction quantities
  • Hydrographic, hydraulic, diffuser and recirculation acceptance results
  • Current brine-plume and receiving-water monitoring against permit conditions
  • Inspection, maintenance, cleaning and repair history for the operating marine assets
  • Interaction with the shared Taweelah coastal intake, outfall and industrial discharge environment

Related records 3

Project availability status

This public project page is a tracked market record rather than a tender notice, contractual commitment, or commercial instruction. Use the status, confidence label, evidence-review date, and source note together when judging how much weight to place on the signal.

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Record control

Evidence reviewed date is not a project-event date.

IMWO changes phase, participants, scope, completion, or acceptance wording only when a dated source establishes the change. The review date records when the evidence set was checked; it does not claim that physical work changed on that date.

Evidence reviewed 19 July 2026 Sources in this record 6

Source record

ACWA's current project profile gives the 200 MIGD capacity, USD 874 million cost, 30-year WPA, ownership, EPC parties, operator and Q1 2024 commercial-operations date. Its first-half 2023 results and later rights-issue chronology preserve the earlier phased operating milestones. The environmental appendices contain a bid-stage HR Wallingford study using ACWA layouts and operating assumptions for intake, outfall, recirculation and brine dispersion. Those design documents describe proposed facilities and model inputs, not a certified final as-built route. Public operating sources confirm the plant function and capacity but do not publish marine completion surveys, contractor package boundaries, accepted diffuser performance or a current condition record.

Phase: completed. Evidence reviewed: 19 July 2026.

Project sources 6