|Construction cost||US$2–5 billion|
|Owner(s)||Government of Tajikistan|
|Dam and spillways|
|Height||265–335 metres (869–1,099 ft)|
|Total capacity||13.3 km3 (10,782,485 acre·ft)|
|Surface area||110.7 km2 (27,400 acres)|
|Installed capacity||3,600 MW (planned)|
|Annual generation||13.1 TWh (planned)|
Rogun Dam is an embankment dam in the preliminary stages of construction on the Vakhsh River in southern Tajikistan. It is one of the planned hydroelectric power plants of Vakhsh Cascade. Over three decades only preliminary construction has been carried out on the dam. Due to its controversial state, construction was suspended in August 2012 pending World Bank reports. The dam has drawn complaints from Uzbekistan downstream who fears it will negatively impact their lucrative cotton crops.
The Rogun Dam was first proposed in 1959 and a technical scheme was developed by 1965. Construction began in 1976, however the project was frozen after the collapse of the Soviet Union. An agreement on finishing the construction was signed between Tajikistan and Russia in 1994; however, as the agreement was not implemented, it was denounced by Tajikistan parliament. In October 2004, an agreement was signed with RUSAL according to which RUSAL agreed to complete the Rogun facility, to build a new aluminum plant and to rebuild the Tursunzade Aluminum Smelter. In February 2007, a new partnership between Russia and Tajikistan to complete the dam was announced but later was refused by Russia because of disagreements concerning the controlling stake in the project. In May 2008, Takijistan announced that construction on the dam had resumed. By December 2010, one of the river diversion tunnels was renovated and rebuilt and the second expected to commence in June or July 2011. Construction on the dam was suspended in August 2012 pending the World Bank assessment.
In 2010, Tajikistan launched an IPO to raise US$1.4 billion to finish construction of the dam. As of April 26, 2010, the Tajik government had raised just US$184 million, enough for two years of construction.
Rogun was listed as the highest dam in the world — 335 metres (1,099 ft) high — but this is a projected height. In reality the dam was only circa 60.96 metres (200.0 ft)  high until 1993 when it was destroyed in a flood. As of 2014[update] three projects are under consideration: the original, 335-metre (1,099 ft), and two alternatives, 300-metre (980 ft) and 265-metre (869 ft), all having their advantages and drawbacks.
In response to the request of the bordering countries and especially Uzbekistan, the World Bank has financed the Techno-Economic Assessment Study (TEAS) conducted by consortium of Coyne et Bellier, Electroconsult and IPA Energy + Water Economics, and Environmental and Social Impact Assessment (ESIA) conducted by Pöyry. The reports, originally slated to be released in February 2012, were delayed until mid-2014. The ESIA was published on 16 June 2014 and the TEAS in July 2014. Overall, the ESIA stated that "Most impacts are rather small and easily mitigated, if mitigation is required at all." and that "There is no impact of the category "strong negative, mitigation not possible", which would have to be considered as a no-go for the project." All parties, including Central Asian states met in Alma-aty in July 2014 for the 5th Riparian Meeting to discuss findings within the TEAS and ESIA.
The project has raised tensions with Uzbekistan over the impact of the dam on its cotton fields' irrigation systems. In February 2010, Uzbek Prime Minister Shavkat Mirziyoyev sent a letter to his Tajik counterpart demanding an independent examination of the possible consequences of the dam. During October 2010, Uzbek President Islam Karimov called the Rogun hydropower plants a "stupid project".
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