Nam Ngiep 1 is a 290 MW hydropower project is located in Bolikhamxay and Xaysomboun provinces of the Lao PDR. The project is being built and
operated by the Nam Ngiep 1 Power Company, whose goal is to build a socially and environmentally responsible power project that provided clean renewable electricity and contribute to poverty reduction in Laos.
Two dams and power stations are constructed along the Ngiep River in Bolikhamxay. The main dam height 167 m willcreated a water storage reservoir covering a 67 km2 area extending into Xaysomboun province.
At the main dam site a primary power station generated around 272 MW of electricity for export to Thailand and release water to a regulating pond where a second dam and power station generate around 18 MW of electricity for local use. The re-regulating dam ensures smooth release of water to minimize the disruption on water levels in the river downstream.
NNP1 together with local people and authorities build high-quality new houses and community facilities for the villagers moving to the Houaysoup area. The Company is also developed a range of livelihood programmes for people affected by the project.
Environmental protection is also crucial to the long-term success of the project and NNP1 has created a dedicated Environmental Management Office to ensure that the project minimizes its local footprint and also contributes to improved conservation measures and environmental awareness on a national scale.
The Project is located on the Nam Ngiep River, a tributary of the Mekong River. The river joins the Mekong at Pakxan which is located about 150 km away from Vientiane Capital. The Nam Ngiep River originates in Xiang Khouang Province and runs about 160 km before joining the Mekong, 1,300 m lower in elevation. The Project area stretch from Bolikhamxay Province to Xaysomboun Province, the main dam, re-regulation dam and powerhouse are located in Bolikhan District, Bolikhamxay Province while major part of the reservoir area belongs to Hom District, Xaysomboun Province.
The Nam Ngiep 1 Hydropower Project was identified in the early 1990s and a preliminary feasibility study conducted in 1991. The Lao government’s agreements with the Project’s initial developers expired and in 1996 the government requested the Japan International Cooperation Agency (JICA) to conduct a full feasibility
study into social and environmental impacts and technical and commercial aspects.
The JICA study, conducted over two phases from 1998-2000 and from 2001-2002, confirmed the Project’s technical feasibility on a Build-Operate-Transfer basis and made recommendations for its optimal development based on physical, economic and environmental and social safeguard considerations.
Japan’s Kansai Electric Power Company joined other interested Japanese partners on further studies in May 2003, and in April 2006 signed a project development agreement with the government. A year later Kansai and the Electricity Generating Authority of Thailand (EGAT) entered an agreement to develop the Project. The Consultations with people living in the project area continued alongside technical studies on topography and geology. On the legal development side, a revised Memorandum of Understanding on tariffs was concluded in July 2011 and a Power Purchase Agreement signed in 2013.
In late 2013 and early 2014 preparations for construction began, with the planning of the access road. In May 2014 national-level consultations involving villagers, local officials, senior politicians, the project developers and financial backers, followed village, district and provincial level meetings. In September that year financial close was reached as the nine banks backing the project reached agreement on fiscal and legal terms, paving the way for full construction to commence.
The Nam Ngiep 1 Project is designed to harness the energy potential of the lower part of the Ngiep River by creating a reservoir that will supply water to a power station situated below a 167 metre high dam.
The electricity generated at this facility will be exported to Thailand.
A second dam and small reservoir are to be built downstream of the main facilities in order to regulate water flows and so minimize disturbances to the river and people living further along the Nam Ngiep. A smaller power station located at this Re-Regulating Dam will supply electricity for use in Laos.
|Nam Ngiep 1 Main Reservoir|
|Reservoir surface area||66.9 square kilometres at normal level|
|Effective storage capacity||1.2 billion cubic metres|
|Catchment area||3,700 square kilometres|
|Average annual inflow||4.7 billion cubic meters or 148.4 m3/s|
|Nam Ngiep 1 Main Dam|
|Type||Roller-Compacted Concrete Gravity Dam|
|Crest height||167 meters|
|Crest length||530 meters|
|Spillway Discharge Capacity (4 x radial gates)||5,210 cubic meters per second|
|Penstock Tunnel Length||185 meters|
|Penstock Tunnel Diameter||5.2 meters|
|Nam Ngiep 1 Main Powerhouse|
|Turbine and generator||2 Francis Units|
|Effective head||130.9 meters|
|Rated output||272 MWs|
|Annual power generation||1,546 gigawatt hours|
|Transmission line||230 kilovolt line, 125 km to Nabong Substation|
|Nam Ngiep 1 Re-Regulation Reservoir|
|Reservoir surface area||1.27 square kilometres at normal level|
|Effective storage capacity||4,600,000 cubic meters|
|Catchment area||3,725 square kilometers|
|Nam Ngiep 1 Re-Regulation Dam|
|Type||Concrete Gravity Dam|
|Crest height||20 meters|
|Crest length||90 meters|
|Discharge Capacity (fixed wheel gate)||5,210 cubic meters per second|
|Nam Ngiep 1 Re-Regulation Powerhouse|
|Turbine and generator||1 Bulb Unit|
|Effective head||12.7 meters|
|Rated output||18 MWs|
|Annual power generation||105 gigawatt hours|
|Transmission line||115 kilovolt line, 40 km to Pakxan Substation|
|Measuring Points||Water level (masl)||Export to EGAT(GWh)||Export To EDL(Gwh)||Compare Year Plans (%)||Production Plan Year 2021 (GWh)|
|Current||Last Weeks||Reservoir level||Crest of Dam (masl)||This Week||Last Weeks||Total 31/12/2020||This Week||Weeks Ago||Total 31/12/2020||EGAT||EDL||EGAT||EDL|
|High (masl)||Low (masl)|