01 What Happened

Mexico’s National Water Commission awarded the Playas de Rosarito desalination construction contract to Cox Energy and Cox Water. The plant is planned at 2,200 L/s, about 190,000 m³/day or roughly 50 MGD, with an execution period of 1,096 days and completion targeted for 2029. The contract is scheduled for signature on August 17, with construction due to begin the following day. The wider project also includes conveyance and storage infrastructure for Tijuana and Playas de Rosarito.

02 Key Takeaways

  • 01 The plant is sized at 2,200 L/s, approximately 190,000 m³/day.
  • 02 The award covers engineering, supply, construction, testing, commissioning and an associated pumping station.
  • 03 Plant CAPEX should be evaluated together with energy, brine management, transmission and storage.

03 Why It Matters

At roughly 190,000 m³/day, membrane design alone will not determine project economics.

Intake configuration, pretreatment stability, SWRO recovery, energy-recovery devices, remineralisation, pumping and downstream conveyance all become first-order cost drivers. The plant contract should therefore be read as one component of a wider water-supply system.

04 ATLAS Engineering View

The lifecycle risk is the interface between plant output and regional delivery. Compliant water at the battery limit creates public value only if storage and transmission are delivered on schedule. TCO analysis should combine specific energy, membrane replacement, chemical cleaning, brine discharge and long-distance pumping. A lower EPC bid does not automatically mean the lowest 30-year water cost.

05 Sources