Siemens Power Transmission and Distribution (PTD) will deliver a turnkey 400-kV/132-kV substation with gas-insulated switchgear to Dubai Electricity and Water Authority (Dewa) as part of the further expansion of the power supply system of the UAE.

The substation will link the H Station power plant at Al Aweer to the country’s power supply network.
The substation also completes the Emirates National Grid (ENG) by providing a link between the power plant and the power supply system of Abu Dhabi.
The order has a value of Dh370 million ($100 million) and start-up of the system is planned for the beginning of 2008.
The turnkey order comprises the delivery of the substation, including 400-kV and 132-kV switchgear, four 450-MVA power transformers (400/132 kV), four 40-MVAR reactors (132 kV), cable systems for 400 and 132 kV; automation, control and protection systems; along with expansion of the network control system and telecommunications equipment. Gas-insulated busducts (GIB) for 400 kV will also be installed to provide the connection to the nearby switchgear in the H Station at the Al Aweer power plant complex, as well as to the high-voltage overhead transmission lines. The GIB links will have a total length of about 6 km. With 24 gas-insulated switchgear bays at 400 kV voltage level and 28 bays for 132 kV, this substation is the largest of its kind that Siemens has delivered to date worldwide.
Most of the electricity used in Dubai is generated by the Jebel Ali power complex, and at present the total output of this complex exceeds 3,500 MW. In addition, the H Station power plant complex at Al Aweer will cover Dubai’s rising demand for electrical power in the future.