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| Lower Sesan 2 Dam | |
|---|---|
| Name | Lower Sesan 2 Hydropower Project |
| Location | Stung Treng Province, Ratanakiri Province, Cambodia |
| Coordinates | 13°52′N 105°30′E |
| Status | Operational |
| Construction began | 2012 |
| Opening | 2018 |
| Dam type | Concrete gravity, run-of-river with storage |
| Height | 46 m |
| Length | 1000 m (approx.) |
| Reservoir capacity | 389,000,000 m³ (gross) |
| Plant capacity | 400 MW |
| Turbines | 4 × 100 MW Francis |
| Owner | China |
| Operator | Sesan-Srepok River Basin Development Company / Royal Government of Cambodia |
Lower Sesan 2 Dam The Lower Sesan 2 Dam is a large hydroelectric project on the Sesan River near the confluence with the Srepok River and the Mekong River in northeastern Cambodia. Built between 2012 and 2018, the project was developed by a consortium including China Hydroelectric Corporation affiliates and Cambodian partners, and it supplies substantial electricity to the Cambodian grid and regional markets. The project has been prominent in debates involving regional development, transboundary water management, and indigenous rights in the Mekong Basin.
Planning for the project occurred within the context of broader development initiatives involving the Mekong River Commission, ASEAN energy dialogues, and Chinese overseas investment strategies such as the Belt and Road Initiative. Proponents framed the project as part of Cambodia’s national electrification targets set by the Ministry of Mines and Energy (Cambodia), with financing and technical assistance tied to companies from the People's Republic of China and regional utilities like Electricité du Cambodge. Environmental impact assessments were produced amid scrutiny from international NGOs including World Wildlife Fund, International Rivers, and The Asia Foundation, while local governance actors such as the Stung Treng Provincial Administration and indigenous communities were engaged through consultations and resettlement plans.
The dam’s engineering draws on designs common to medium-head hydro projects, employing reinforced concrete gravity sections, a spillway complex, and an upstream reservoir intended to regulate flow between the Sesan, Srepok, and Mekong tributaries. The powerhouse houses multiple Francis turbines supplied by Chinese manufacturers similar to those used in projects by China Three Gorges Corporation and Sinohydro. Construction contractors included subsidiaries linked to Hydrolancang International Energy and Chinese construction conglomerates, while civil works involved mobilization of heavy equipment from Yunnan and construction materials sourced through regional supply chains involving Thailand and Vietnam. Project scheduling intersected with approvals from the Royal Government of Cambodia and required land acquisition overseen by provincial land management offices.
The plant’s installed capacity of 400 MW is dispatched into Cambodia’s transmission system operated in coordination with Electricité du Cambodge and regional interconnect projects that link to the Laos and Thailand grids. Generation is subject to seasonal variability dictated by the Mekong hydrological cycle, monsoon patterns monitored by agencies such as the Asian Development Bank and National Mekong Committee entities. Power purchase agreements and concessional financing arrangements referenced terms used in bilateral infrastructure deals with Chinese state-owned enterprises and multilateral financiers engaged in Southeast Asian energy projects.
Environmental assessments highlighted anticipated impacts on fisheries important to communities along the Sesan River, including spawning migrations of species described in studies by Conservation International and researchers affiliated with Royal University of Phnom Penh. Reservoir inundation altered riverine habitats and flooded swathes of floodplain forest and agricultural land used by indigenous groups such as the Kuy and Stieng peoples. Social programs included relocation plans coordinated with provincial authorities and NGOs including Cambodian Human Rights Action Committee affiliates, but observers from Human Rights Watch and Amnesty International raised concerns about consultation adequacy, livelihood compensation, and preservation of cultural sites.
Controversies centered on alleged shortcomings in the environmental and social safeguards, disputed compensation for displaced households, and questions about transboundary impacts on downstream fisheries that involve riparian states such as Laos and Vietnam. Legal actions and public protests involved civil society organizations, local community representatives, and parliamentary oversight hearings convened by the National Assembly (Cambodia). International legal and policy debates referenced instruments and forums including the Mekong River Commission procedures, bilateral investment agreements between Cambodia and China, and standards promoted by the World Bank and International Finance Corporation despite the project’s primary financing architecture being bilateral and corporate.
Economically, the project contributes to Cambodia’s industrial energy supply and revenue streams through electricity sales, impacting sectors such as manufacturing and mining operations in northeastern provinces. The dam forms part of regional infrastructure linkages discussed at ASEAN energy summits and in cross-border planning with Thailand and Vietnam for trade in electricity and grid resilience. Fiscal arrangements, royalties, and concession terms influenced provincial budgets administered by Stung Treng Provincial Hall and central planning coordinated by the Council for the Development of Cambodia.
Operational safety follows standards comparable to other large dams overseen by national agencies and inspection routines influenced by practices from China National Committee on Large Dams and international consultancy firms. Monitoring includes hydrological gauging, sediment management, and fish passage assessments with technical support from academic partners at institutions like Royal University of Phnom Penh and regional research centers such as the Mekong River Commission Secretariat. Maintenance planning addresses turbine servicing, spillway integrity, and reservoir sedimentation forecasts used to model long-term performance and downstream flow regimes.
Category:Hydroelectric power stations in Cambodia Category:Mekong River projects