72-hour trial run of the No. 21 generating unit of the Three Gorges Right Bank Power Station
On August 20, after a series of rigorous waterless and water-conserving test runs, as well as a 72-hour trial operation, Unit 21 of the Three Gorges Project's Right Bank Power Station was officially commissioned at 4:00 PM. This milestone marked another step forward in the massive hydroelectric project that continues to shape China’s energy landscape.
Unit 21 is the second unit installed by the China Hydropower Fourth Bureau at the right bank power station, and it is the third unit overall in that section. To date, 17 giant 700,000 kW hydroelectric generators have been successfully put into service at the Three Gorges Power Station, contributing significantly to the country's electricity supply.
On the day of commissioning, the inflow rate at the Three Gorges Dam reached 18,500 cubic meters per second, with the reservoir level standing at 144.88 meters. At this water level, the average daily power output of the entire station exceeded 260 million kilowatt-hours, demonstrating its critical role in meeting regional energy demands.
Built by Alstom of France, Unit 21 was installed by the China Hydropower Fourth Bureau starting on October 24, 2006. The installation and commissioning process took over 10 months, reflecting the complexity and precision required for such large-scale infrastructure projects.
During the commissioning phase, Unit 21 stood out among the 10 Alstom units installed at the site. It demonstrated the most stable performance and the shortest commissioning time, earning praise from the start-up acceptance committee. They confirmed that the unit met all technical requirements and authorized it to be connected to the national grid for power generation.
The Three Gorges Project plans to install a total of 32 units of 700,000 kW hydro-generators. So far, 14 units have been activated on the left bank, while 12 are located on the right bank. As of August 20, three of these right bank units were already in operation. Additionally, six underground power stations remain under construction, highlighting the ongoing development of this iconic engineering marvel.
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