Maps
Project in Brief
The hydraulic potential of a system of river flows on the Bolaven Plateau were exploited rationally. Water from the Houay Makchanh were impounded and diverted to the Xe-Pian catchment along the Xe-Pian River whose waters were likewise impounded. Water from the Xe-Pian Catchment are channeled to the Xe-Namnoy Reservoir which is also fed by the Xe-Namnoy River. The Xe-Namnoy Reservoir in turn conveys water through an underground water transfer conduit, vertical pressure shaft, high pressure tunnel and penstock to drive the turbines of one Pelton and three Francis generators at the powerhouse to produce electricity. Meanwhile, a tailrace water channel discharges water from the Powerhouse to the Xe Kong River before it reaches the Mekong River. To ensure that the environmental and ecological integrity of the river below the Xe-Pian Dam is maintained, the Xe-Namnoy Reservoir provides a constant and environmental release flow.
The Project generates 1,879 Gwh of electricity per year. The Project exports 90% of the electric power it generates to Thailand under a Power Purchase Agreement between the Electricity Generating Authority of Thailand and the PNPC, while the remaining 10% is sold to the local grid under a Power Purchase Agreement between the PNPC and the Electricite du Laos.
The PNPC currently operates and manages the Project until its 27-years Concession Period expires. Commercial operations commenced in December 22019 after a 5-years Construction Period. After the expiry of its Concession Period, the PNPC will transfer the Operations and Management of the Project to the Government of Laos.
2019 – 2020
2015 – 2017
2012 – 2014
2009 – 2011
2006 – 2008
2003 – 2005