The Lianghekou Dam ("meaning:" "mouth of two rivers") is a clay-core rockfill Embankment dam currently in operation on the Yalong River, a tributary of Yangtze River, in Yajiang County, Sichuan Province, China. The dam is located at the confluence of the Yalong, Xianshui and Qingda Rivers. The tall dam is the highest embankment dam in the country and support a 3,000 MW power station. Studies for the dam were completed between 2005 and 2009 with preliminary construction beginning that year. Major works on the dam officially began in October 2014. The first two generators were commissioned in September 2021 and the final unit was put in service in March 2022. With the reservoir's relatively large active capacity with respect to the river's annual flow, it can regulate the river flow across multiple years and increase the downstream hydroelectric power stations' output by smoothing out river flow peaks and troughs. 
A Pumped-storage hydroelectricity plant of 1200 MW is under construction taking advantage of the large reservoir size. 
Over 4,900 people were relocated during the construction of the dam. 
There are several solar and wind projects that in operation (1,000 MW) or under construction (2,200 MW) near the dam taking advantage of the dam's existing power transmission system and the ability to regulate the hydroelectric power output compensating the variable renewable power output. 
See also.
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