***District cooling, sewage treatment, irrigation water production and distribution, potable water subdistribution.*** **| The challenge** Bahrain Bay is a 30 ha mixed-use waterfront development with an ultimate gross floor area of 1.5 million m² comprising the Arcapita Headquarter, the Four Seasons Hotel, the Grand Wyndham Hotel, the Al Baraka bank headquarter and a future variety of residential, commercial and hospitality high-rise buildings. Bahrain Bay Utilities, a joint-venture between Veolia and a funds managed by Arcapita, supports Bahrain Bay Development in this major infrastructure breakthrough. **| Veolia’s solution** **Seawater for cooling** Bahrain Bay’s district cooling system includes a 45,000 RT\* district cooling plant (DCP) and a 4 km chilled water distribution network. The heat transferred by the 17 available chillers is rejected through 9 evaporative cooling towers using seawater. **Sewage treatment** The indoor Sewage Treatment Plant (STP) provides a high quality of effluent using state of the art technologies: - Membrane Bioreactors (MBR) that connect membrane filtration to a biological active sludge system. - A INOS filter press for dewatering the sludge above 90% of dryness.  **| The benefits** All the Bahrain Bay buildings connected to the District Cooling system are free from the requirement of having their own in-house chiller plant. This results in economies of scale and in an increase of the net real estate space available for building owners.