Alstom delivers gate system to hydropower dam in China

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Paris, March 21, 2011 – Tianjin Alstom Hydro has successfully delivered the world’s first self-closing electronic ring gate control system to the Ahai hydro power station in China, representing a major technical advance for the safety of the dam.

The system supplied by Alstom boasts an electronic ring gate control system with hydraulic synchronization – meaning that in an emergency, the system can close by itself, cutting the flow of water to stop the turbine.

The system is extremely reliable, offering easy operation and maintenance, high precision and outstanding safety compared with traditional ring gate systems.

The process of model and product development, design, manufacture, assembly and testing took just 8½ months and is the result of effective collaboration between Tianjin Alstom Hydro Co. and the Alstom research and development center in Grenoble, France.

The Ahai dam, owned by Yunnan Jinsha River Hydropower Co. Ltd, is currently under construction and comprises 5×400 MW Francis hydro turbine generator units, for which the five turbines are being supplied by Alstom under a contract worth about $125.6 million. The first unit will be commissioned in spring 2012.

With a diameter of 10 meters, a height of 2.6 meters and weighing 110 tons, the Ahai ring gate is the biggest one in the world.

As one of China’s hydro equipment producers, Alstom is involved in all the country’s major hydro power projects including Three Gorges Dam (14×700 MW units), Guanyinyan (3×600 MW units), Liyuan (4×600 MW units) and Xianjiaba (4×800 MW units). The 800 MW turbines designed, engineered and manufactured by Alstom for Xianjiaba are the world’s largest hydro turbines ever manufactured to date.

Alstom inaugurated a new hydropower manufacturing site in November 2010, capable of delivering up to 30 turbine and generator units per year with outputs ranging from 20 MW to 1,000 MW.

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The Clarion Energy Content Team is made up of editors from various publications, including POWERGRID International, Power Engineering, Renewable Energy World, Hydro Review, Smart Energy International, and Power Engineering International. Contact the content lead for this publication at

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