|Location||Tian'e County, Guangxi|
|Construction cost||US$4.2 billion|
|Owner(s)||Longtan Hydropower Development Co., Ltd.|
|Dam and spillways|
|Type of dam||Gravity|
|Height||216.2 m (709 ft)|
|Length||849 m (2,785 ft)|
|Dam volume||7,670,000 m3 (10,031,981 cu yd)|
|Spillway type||Service, controlled|
|Spillway capacity||27,134 m3/s (958,228 cu ft/s) (max flood)|
|Total capacity||27,270,000,000 m3 (22,108,149 acre·ft)|
|Active capacity||20,530,000,000 m3 (16,643,942 acre·ft)|
|Catchment area||98,500 km2 (38,031 sq mi)|
|Normal elevation||400 m (1,312 ft)|
|Hydraulic head||179 m (587 ft) (max.)|
|Turbines||9 × 714 MW Francis-type|
|Installed capacity||6,426 MW|
|Annual generation||18,700 GWh (estimate)|
Longtan Dam (simplified Chinese: 龙滩大坝; traditional Chinese: 龍灘大壩; pinyin: Lóngtān Dàbà) is a large roller-compacted concrete (RCC) gravity dam on the Hongshui River in Tian'e County of the Guangxi Zhuang Autonomous Region, China, a tributary of the Xi River and the Pearl River. The dam is 216.2 m (709.3 ft) high and 849 m (2,785 ft) long; it is the tallest of its type in the world. The dam is intended for hydroelectric power production, flood control and navigation. The dam contains seven surface spillways, two bottom outlets and an underground power station.
The dam was planned in the 1950s but preliminary construction (roads, bridges, river diversion) did not begin until 1990. Formal construction began on the project July 1, 2001 and the river was diverted by November 2003. A total of 20,000,000 m3 (706,293,334 cu ft) of material were excavated from the dam site. Impounding of the 27,270,000,000 m3 (22,108,149 acre·ft) reservoir began in 2006 and the dam's first of three operational hydroelectric generating units was testing May 2007. In 2009, the last generator became operational and the installed capacity increased to 6,426 MW, its annual generation is estimated at 18.7 TWh.
- "Hongshui River in south China to be dammed in November". China Daily. 2003-10-26. Retrieved 2008-02-10.
- Ben Shaw. "Building Longtan". Potain. Retrieved 2008-02-10.
Li Xuejiang, a manager with one of the technical departments for the contracting joint venture, explains the working process at the site: “This jobsite operates 24 hours a day, seven days a week – in common with most working job sites in China.”
- Hydroelectric Power Plants in Guangxi & Guizhou, China
- "Longtan". Chinese National Committee on Large Dams. Retrieved 7 January 2011.
- "First generator of China's 3rd largest hydropower project passes trial operation". People's Daily. 2007-05-28. Retrieved 2008-02-10.
"We are preparing for the operation of the other two generators, which is also slated for this year," said Dai Bo, general manager of the Longtan Hydropower Development Co. of China Datang Corporation (CDT).