|Opening date||2019 (expected)|
|Construction cost||$3.8 billion|
|Owner(s)||Ch. Karnchang Public Company|
|Dam and spillways|
|Height||32.6 m (107 ft)|
|Length||820 m (2,690 ft)|
|Type of spillway||10 x radial gates|
|Spillway capacity||3,980 m3/s (141,000 cu ft/s)|
|Capacity||1.3 km3 (1,100,000 acre·ft)|
|Catchment area||272,000 km2 (105,000 sq mi)|
|Surface area||49 km2 (19 sq mi)|
|Hydraulic head||18 m (59 ft) (rated)|
|Turbines||7 x 175 MW Kaplan-type, 1 x 60 MW Kaplan-type|
|Maximum capacity||1,285 MW|
|As of 6 February 2011|
The Xayaburi Dam is a hydroelectric dam under construction on the Lower Mekong River approximately 30 kilometres (19 mi) east of Xayaburi (Sainyabuli) town in Northern Laos. The main purpose of the dam is to produce hydroelectric power. The project is surrounded in controversy due to complaints from downstream riparians and environmentalists. Preliminary construction began in early 2012, but work on the dam itself was suspended shortly thereafter due to complaints from Cambodia and Vietnam downstream. After making modifications to the dam's design, Lao plans to start full construction with a ceremony on 7 November 2012.
On 4 May 2007, the Lao government signed a memorandum of understanding with Thailand's Ch. Karnchang Public Company for the development of this hydropower project. The formal project development agreement followed in November 2008, and a feasibility study was conducted that same year by Swiss-based AF Colenco and Thai TEAM consultants. The environmental impact assessment report was submitted in February 2010. In July 2010, a memorandum of understanding for power purchase was signed between the Electricity Generating Authority of Thailand and the Lao government.
According to the 1995 Mekong Agreement, the project is subject to the Mekong River Commission (MRC) Procedures for Notification, Prior Consultation, and Agreement. Under this agreement, the host country for the project should notify the governments of the other signatories, namely Cambodia, Thailand, and Vietnam. The process was initiated in September 2010. It is the first project initiated through a regional decision-making process.
On 19 April 2011, the MRC Joint Committee announced that the MRC countries could not reach a consensus on how to proceed with the project, and agreed that a decision on the prior consultation process be tabled for consideration at the ministerial level. However, in June 2011, the Laos Government gave the Thai developer Ch Karnchang the go-ahead to resume work on the Xayaburi Dam, informing the company that the Mekong River Commission's decision-making process was completed. Prashanth Parameswaran, a former researcher at the Project 2049 Institute, who is conducting research on dam projects in Southeast Asia, warned: "Laos' actions not only represent a breach of trust, but threaten to undermine already fledgling efforts at regional cooperation in an ecosystem that supports the livelihoods of tens of millions of people." Construction on the dam was reported to have began on 15 March 2012 after Ch.Karnchang announced on 17 April 2012 they signed a $2 billion contract with the Xayaburi Power Company. Preliminary construction (roads, bridges, support facilities) had accelerated in the last few months. Cambodia's government immediately reacted to the announcement, threatening to take Laos to international court if they chose to build it unilaterally. Laos announced a halt to construction on 11 May 2012 due to complaints from neighbors and environmental groups.
The Xayaburi dam has been proposed on a site located 350 kilometres (220 mi) upstream of Vientiane and 770 kilometres (480 mi) downstream of Jinhong, the last dam of the Chinese cascade of seven dams, including 4 existing dams and 3 planned ones. In terms of mean energy supply, it would be the third largest project among those considered for development on the mainstem in the Lower Mekong Basin.
The Xayaburi Dam would be 820 metres (2,690 ft) long and 32.6 metres (107 ft) high with a rated hydraulic head of 18 metres (59 ft). Sitting at the head of a 272,000 square kilometres (105,000 sq mi) catchment area, it would create a reservoir with 1.3 km3 (1,100,000 acre·ft) gross storage capacity and a surface area of 49 square kilometres (19 sq mi). The reservoir would reach 30 metres (98 ft) in depth and stretch between 60 and 90 kilometres (37 and 56 mi). The dam would feature a navigation lock and two fish passes.
The power plant would house seven 175 MW Kaplan turbine-generators and one 60 MW Kaplan turbine generator. The total installed capacity would be 1,285 megawatts, with a total annual energy production of 7,406 GWh. Around 95% of produced electricity (the seven 175 MW generators) would be exported to Thailand through a planned 200-kilometre (120 mi) long transmission line from the Xayaburi Dam to the Loei Province in Thailand. If the final investment decision is made, the dam's construction would take eight years and it would cost approximately US$3.5 billion. It could become operational by 2019.
Some people question whether the dam will function in the long term because its reservoir may be filled with silt. A team of international sediment experts engaged by the Mekong River Commission (MRC) looked at this question and concluded that a proper sediment management plan and redesign of sediment passing structure will minimize sediment trapping. The developer claims it has now accepted the MRC's conclusions and adopted its recommendations on sediment management. See the MRC's PNPCA review of sediment. http://www.mrcmekong.org/assets/Consultations/2010-Xayaburi/Annex3-Sediment-Expert-Group-Report.pdf
Developers, engineers and financiers
The project is developed by Xayaburi Power Company Limited, a subsidiary of the Thai construction company Ch. Karnchang Public Company Limited. Ch. Karnchang Public Company is also the leading contractor for the project.
A syndicated loan of 80 billion Thai Baht (2.67 billion USD at the March 2013 exchange rate) is provided by four Thai banks: Bangkok Bank, Kasikorn Bank, the government-owned Krung Thai Bank and Siam Commercial Bank. Another source mentions six Thai banks without specifying their names.
The engineer for the dam is the Finnish company Pöyry. Pöyry carried out a comparison between the original design of the dam and the recommendations of the Mekong River Commission, a body that brings together all riparian states of the Lower Mekong and that has carried out a strategic environmental assessment for the impact of the planned cascade of dams on the Mekong. In that comparison, Pöyry recommended to improve the sustainability of the dam "including additional environmental studies, installation of additional fish ladders and other measures to improve fish migration as well as technical design modifications to improve the sediment and nutrients handling." After this, Pöyry was contracted to modify the design and to supervise the dam's construction, without awaiting the results of the unspecified "additional environmental studies".  Critics point out that analyzing the environmental impact of a dam inherently constitutes a conflict of interest with the more lucrative design and supervision of the dam. Pöyry stated and even guaranteed that the dam’s environmental impacts could be mitigated, a statement for which it was severely criticized. The French engineering company Compagnie Nationale du Rhône (CNR) was hired to provide expertise an independent "peer review" of the Pöyry findings related to hydrology, navigation and in particular sediment transport. CNR recommended further studies "to improve the project". This was interpreted as CNR distancing itself from Pöyry's conclusions.
According to International Rivers, around 2,100 people would be resettled, and more than 202,000 people living in the dam's area would experience impacts due to the loss of agricultural land and riverbank gardens, cause an end to gold panning in the river, and provide less access to the forest resources of the Luang Prabang Range. The Xayaburi dam would also have a significant effect on the biodiversity of the river ecosystem, and the fisheries within the larger Mekong river basin. According to a World Wildlife Fund (WWF) report, the Xayaburi dam would drive the already critically endangered Mekong Giant Catfish (Pangasianodon gigas) to extinction.
Because the Mekong is a unique and particularly complex ecosystem that hosts the most productive inland fisheries in the world, the stakes are high for the construction of such a dam. According to a study conducted by WWF and the UN Food and Agriculture Organization, and coordinated by the WorldFish Center, there are 229 fish species whose spawning and migratory patterns would be affected by a mainstream dam. This change in fish biodiversity and abundance would greatly affect the tens of millions of people in the Greater Mekong Subregion who depend on the river for their food and livelihood. According to Phnom-Penh based WorldFish Center, this damage to fisheries "cannot be mitigated by fish passes and reservoirs".
A Strategic Environmental Assessment commissioned by the Mekong River Commission (MRC) recommends a 10-year deferral of all Mekong mainstream dams in Cambodia, Laos, Thailand, and Vietnam, and calls for further studies. According to a MRC spokeswoman construction of the Xayaburi dam "will result in irreversible environmental impacts". The MRC warns that if Xayaburi and subsequent schemes went ahead, it would "fundamentally undermine the abundance, productivity and diversity of the Mekong fish resources".
Milton Osborne, Visiting Fellow at the Lowy Institute for International Policy who has written widely on the Mekong, warns: "The future scenario is of the Mekong ceasing to be a bounteous source of fish and guarantor of agricultural richness, with the great river below China becoming little more than a series of unproductive lakes."
None of the mitigation measures for fish and sediment passage included in the dam's current design have been tested at this scale or in this environment. “Nowhere in the tropics has a successful fish passage been built for a dam the size of Xayaburi,” said Dr. Eric Baran of the World Fish Centre in Phnom Penh, Cambodia. “It is unreasonable to assume that the proposed fish passage options will be efficient when they are neither based on successful experience in a similar context nor on a study of the local species.”
Fish are a staple of the diet in Laos and Cambodia, with around 80 per cent of the Cambodian population's annual protein intake coming from fish caught in the Mekong River system, with no alternative source to replace them. Dams would also restrict the flow of water over agricultural areas linked to the river.
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Mekong River Commission, The Facts - Proposed Xayaburi Hydropower Project Prior Consultation Process » http://www.mrcmekong.org/news-and-events/consultations/proposed-xayaburi-hydropower-project-prior-consultation-process/
- MRC nations invited to visit dam
- Fish passage principles to be considered for medium and large dams: The case study of a fish passage concept for a hydroelectric power project on the Mekong mainstem in Laos