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Project Background:

In November/December 1997, the Privatisation Committee for the Water and Electricity Sector (PCWES) of the Government of the Emirate of Abu Dhabi issued its Request for Proposals (RFP) inviting pre-qualified foreign companies or consortia to submit proposals for the development of a new power generation and sea water desalination project to be located at the Taweelah Complex north east of the City of Abu Dhabi. The Project was referred to as the Taweelah A-2 Independent Water and Power Project. This Project is to be the first independent water and power project in the United Arab Emirates.

The project was initially intended to add a net capacity of between 480 to 580 MW of power at 46 ؛C. ambient temperature and 50 MIGD of water at a seawater temperature of 35 ؛C to the transmission systems of the Emirate of Abu Dhabi. The gross power capacity was increased to 710 MW during negotiations between CMS Generation and ADWEA.

Apart from the power and water production facilities, the Project also requires a number of associated facilities, namely:

  • An extension to the existing 400 kV grid station of the Taweelah B power generation and seawater desalination plant (the Electrical Special Facilities).

  • A new potable water pumping station (the Water Special Facilities).

 
Equipment

 

The electrical generation and water production plant was supplied by Siemens and Hanjung. The scope of supply includes the following major equipment.

  • Three (3) gas turbine (GT) generator sets.

  • Two (2) back pressure steam turbine (ST) generator sets.

  • Three (3) heat recovery steam generators (HRSG).

  • Two (2) dump condensers.

  • Three (3) exhaust gas bypass stacks and diverter dampers.

  • Four (4) 12.65 MIGD multistage flash desalination plants.

  • Seawater intake works.

  • Remineralisation plant.

  • Water storage facilities.

  • Potable water pumping station.

  • Distributed control system.

  • Fuel oil unloading and storage facilities.

The plant uses natural gas as the primary fuel. However, facilities to allow for the storage and use of fuel oil as a “backup” fuel are provided. The plant must be capable of maintaining the required output in respect to the electrical and water production ratio when burning the backup fuel for a minimum period of seven days.

The plant exhaust emissions are controlled with the Siemens dry, low-NOx, hybrid burner ring combustion design. The HRSG’s are equipped with supplementary firing and forced draft fans providing additional output under periods of low GT loads, which enables the water production requirements to be met under these circumstances.

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Heat Recovery Steam Generator (HRSG) 11

The desalination plant comprises four (4) X 12.65 MIGD multistage flash distillers, associated seawater intake works, a re-mineralisation plant, potable water storage tanks and a potable water pumping station.

Other facilities include emergency run down diesel generators, water treatment plant, fuel oil unloading and storage, fire fighting, plant buildings and other features.

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Desalination Unit 11 

 

Project Site

 

The plant is situated on the Taweelah site, which is a coastal location approximately 65 km north east of the City of Abu Dhabi. The Taweelah A2 plant sits between the existing Taweelah A1 and Taweelah B plants.

Access to the site can be obtained using the existing road system from Abu Dhabi to Dubai, which is generally a dual carriageway. A paved road system exists within the site area, and an additional area for an enlarged access route to the site has been allowed for in regional planning.

The site area for the Taweelah A2 plant is at the same grade level as the A1 and B plants, and is elevated sufficiently to avoid any risk of flooding. Deeper foundations will penetrate the water table and will require de-watering during construction.

Reasonable laydown areas and space for contractors’ accommodation is available within the Taweelah area, but not immediately adjoining the site.

The site is an area of low seismic activity and is considered stable.

A jetty facility for off-loading large plant pre-assembled modules from barges is available adjacent to the seawater intakes. This jetty should enable the desalination plant to be shipped in large sections, thus reducing construction time on site.

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Taweelah Jetty Used for Large Component Shipment 

 

Mode of Operating Plant

 

Taweelah A2 Operating Company operates and maintains the plant under a 20-year management, operation and maintenance agreement.

The power units and the desalination units are under the dispatch authority of the National Control Center (NCC), managed by TRANSCO. The dispatch of the power and water units are regulated in accordance with the Power and Water Purchase Agreement (PWPA) and the Electricity and Water Transmission Codes of Abu Dhabi.

The annual electric power and potable water demands in the Emirate of Abu Dhabi have different profiles. The electrical demand varies significantly on a seasonal basis, with the hot summer period from May to October being the months of highest demand. The water demand remains relatively constant throughout the year.

The plant is required to deliver 100% water output at an electric output as low as 30%. The plant is further required to be able to deliver 100% water while one (1) gas turbine generating unit is off-line. The Taweelah A2 plant has been designed to offer operational flexibility and accommodate these criteria.

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Inside Turbine Hall at Taweelah A-2 Plant

 
 
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