Obayashi has received a contract from Nam Ngiep 1 Power to provide civil engineering works for the 288MW Nam Ngiep 1 hydropower project in Borikhamxay, Laos.
Under the contract, Obayashi will be responsible for the construction of the main dam body, two Francis power stations with outputs of 270MW and 18MW respectively and a road for the around $0.9bn project.
The project will also include concrete gravity dams on the Nam Ngiep River, a tributary of the Mekong. Its main dam will measure 148m in height, 530m in length at the top, and the volume of the body is approximately two million m3.
The preparatory works for road, river diversion, excavation for the dam foundation and temporary facilities for the dam will be carried out between 2013 and 2015 with concrete placement of the main dam set to start in 2016 and power generation expected to begin in January 2019.
Co-owned by KPIC Netherlands (45%), a subsidiary of Kansai Electric Power, EGAT International (30%), and Lao Holding State Enterprise (25%), the project's objective is to provide electricity to the national grid and to Lao's neighboring countries to earn foreign exchange needed for national development.
To be developed as a build-operate-transfer (BOT) project, with an annual power generation of around 1,620GWh, it will sell its output to EGAT and the Lao Government-owned Electricite du Laos (EdL) for 27 years under a power purchase agreement.
The power transformers being arranged next to the power station building will be connected to the 230kV substation by means of overhead lines.
Additionally, a supervisory control and data acquisition (SCADA) system will enable the monitoring, supervision and control of the power stations and substations and also enable analysis of power station conditions, ensuring automatic operation of both the main power station and the re-regulation power station.
Image: Design of Nam Ngiep 1 hydropower project in Laos. Photo: courtesy of Obayashi Corp.