Bids to expand Muscat's Al Ansab sewage treatment plant from 125,000 to about 207,000 m³ a day, and Al Amerat from 18,000 to 54,000 m³ a day, are due on 5 January 2027. Nama Water Services is procuring both expansions as one build-own-operate-transfer project.
The bidders
At least three consortia are preparing bids, according to MEED in September 2026: Etihad Water and Electricity with Metito, Lamar Holding with Tawzea, and Civil Works Company with SUEZ. Veolia, Miahona and Samsung E&A also prequalified. Qualification began in November 2025 and Nama Water Services issued the request for proposals in July 2026.
What the winner takes on
The private partner would design, finance, build and operate the new capacity and take over operation of the existing plants. SUEZ already runs day-to-day operations in Muscat and North and South Al Sharqiyah under a 15-year contract awarded in June 2026.
Why wastewater
Wastewater accounts for OMR 7.2 billion of the OMR 11.1 billion Integrated Master Plan to 2050. Coverage was 31.7% in 2025, against about 72.4% for water, by the company's figures reported in April 2026.
Smaller plants are also out
Two smaller treatment tenders close earlier: a 1,400 m³ a day plant at Masirah on 30 November 2026, and a decentralised plant at Ansab Park on 23 November 2026, with tender fees of OMR 500 and OMR 50.
How Nama Water Services buys, who already holds its major contracts, and which supplier categories to prioritise are set out in the brief. The full report, Nama Water Services: Utility Account Brief, is available for USD 499. For a free overview, read the Nama Water Services Utility Snapshot.