Consortium files to construct tunnels for Peru’s 150 MW Peihap project
A filing submitted to securities regulator Superintendencia del Mercado de Valores shows a Peruvian and Italian consortium will construct two tunnels as part of the first phase of the country’s 150 MW Peihap project.
The US$140 million job – to be completed within five years by Peru’s Obrainsa and Italy’s Astaldi – includes the construction of two tunnels that will be used to transport water to the 150 MW Cashapite and 150 MW Gramadal hydropower stations.
The plants are part of Peru’s Alto Piura project, which also seeks to improve the region’s agriculture through irrigation infrastructure.
Dam safety upgrade completed in NSW, Australia
A US$11 million Ajenti Data Management System developed by Entura, part of the Hydro Tasmania Group, is in place as a safety upgrade to Lake Endeavour Dam in Parkes Shire, New South Wales, Australia. It included upgrades to the dam wall and spillway and implementation of an early warning system (EWS) for downstream residents and emergency services.
The Ajenti system allows real-time observations to be combined with rainfall forecasts, using modelling to determine likely inflows to the dam and related changes in water level over a seven-day forecast period, said Andrew Francis, infrastructure director for Parkes Shire Council. The EWS at Lake Endeavour Dam combines water levels from two locations in the catchment area with data from the Bureau of Meteorology.
“An effective flood forecasting system is a vital tool for managing the significant risks that floods pose to communities, infrastructure and the environment,” said Dr. Fiona Ling, Entura’s principal consultant in hydrology, resource management and investigations. “If you can clearly understand the likelihood and scale of potential flooding and get accurate and timely warnings, you can better manage water infrastructure and implement safety plans in time to protect assets and communities at risk.
“Staff can monitor the system via a simple interface, but the system is designed to be ‘set and forget.’ If water levels are likely to reach a pre-determined level, the system automatically alerts staff.”
Hydro Tasmania has 55 major dams and is Australia’s largest renewable energy provider.
410 MW Xe-Pian Xe-Namnoy project in Laos includes three dams
Construction of Xe-Pian Xe-Namnoy Power Co.’s (PNPC) US$1.02 billion 410 MW Xe-Pian Xe-Namnoy hydroelectric project in Lao People’s Democratic Republic includes the construction of three dams: Houay Makchan Dam, Xe Pian Dam, and Xe-Namnoy Dam along the Mekong River.
Xe-Pian and Xe-Namnoy are rockfill dams that will be constructed on the Bolaven plateau, along with saddle dams and Houay Makchan Dam, while the powerhouse will be located at the plateau base, giving the scheme a head of more than 630 m. Water will be discharged to the Xe Kong River.
Developers think the project, about 20% complete, will annually generate about 1,860 GWh. Construction began in February 2013 and commercial operations are expected to begin in 2019 if the project does not experience any additional major delays.
Government says region of proposed 1,400 MW Baleh project safe from seismic activity
A study released in December by the Malaysian government concluded no significant risk for seismic activity exists in the region where the 1,400 MW Baleh hydropower facility could be constructed.
Baleh is scheduled for construction on the island of Borneo. The dam will be a 200 m-high concrete faced rockfill dam that has a total volume of 20 million m³ of embankment fill, making it one of the world’s largest concrete faced rockfill dams, according to published reports. Civil structures include two 12 m-diameter concrete lined diversion tunnels and a radial-gated spillway capable of discharging 20,000 m3/s.
Questions regarding the area’s geographic stability and its impact on Baleh Dam’s integrity were raised after a magnitude 6 earthquake struck in June, about 600 km away in Ranau, which is north and east on the tip of Borneo at Celebes Sea. However, a report made available in December by Malaysia’s Natural Resources and Environment Board cites numerous studies that show evidence of karstic limestone in the project’s reservoir area and that leakage in the reservoir is likely.
The document draws on geological and seismic assessments conducted by MWH Global Malaysia and the GHD Group in 2010 that establish the area meets International Commission on Large Dams (ICOLD) safety standards, along with similar studies conducted by the Seismology Research Centre of Australia for SMEC Malaysia during the past year.
The government has yet to determine whether it will proceed in building Baleh, although it maintains it wants to use hydropower to help make the Sarawak Corridor a “developed” region by 2020.