A consortium of Spanish conglomerate Acciona and Portuguese firms Mota Engil and Edivisa (Visabeira Group) have bagged a €110M contract from Iberdrola to build the Alto Tâmega dam and hydroelectric plant on the river Tâmega in Portugal.
A Ferrovial Agroman-led consortium has been awarded a contract by Iberdrola to construct the Gouvães hydroelectric plant on the Tâmega river in northern Portugal.
Andritz Hydro has secured a €140M order from Spanish utility Iberdrola Generación for a new pumped storage hydropower plant in Gouvães, Portugal.Under the contract, the company will design, manufacture, supply and provide installation supervision for the complete electro- and hydro-mechanical equipment, including reversible pump turbines, motor generators and electrical power systems.It will also involve the design, manufacture, supply and complete installation of a penstock with a weight of 12,000t, a diameter of 5,400mm, and length of 2.5km.The hydropower plant — located on the Támega River in northern Portugal, close to the city of Porto — will have four pump turbines, each with a capacity of 220MW. It will consist of three power stations with a total power production of about 1,200MW.
A selection of current construction work and studies shows hydropower’s wide range, says Patrick Reynolds. Numerous hydropower and pumped storage projects are in construction or planning across the globe, and International Water Power & Dam Construction (IWP&DC) briefly notes progress and developments on a selection in Asia, Europe, North America and South America, and also the Middle East.A major hydropower scheme that is well advanced is the Ulu Jelai project, in Malaysia. Being constructed by Salini Impregilo, the project involves significant surface and underground works.Both surface and underground works feature in the Foz Tua pumped storage project, in Portugal, and which is also at an advanced stage. The project involves construction of a 108m-high double-curvature arch dam.Developing hydropower where a new dam is not needed, efforts are pushing ahead in the US to exploit existing lock and dams structures, such as the run-of-river projects being undertaken by power company American Municipal Power (AMP) on the Ohio River. The plants under construction include 72MW Smithland.Statkraft may give the go-ahead this year for two run-of-river projects in Chile, following an acquisition in 2015. However, following a recent review of its investment programme it has yet to decide what action it will take.Many further projects are coming, and a few among those include recent awards for consultants MWH Global and ÅF, respectively, in South America, Europe and the Middle East.Malaysia: Ulu JelaiConstruction of the 383MW Ulu Jelai hydropower project, in Malaysia, has been underway since 2011 and is well advanced, including the recent milestone completion of the Susu roller compacted concrete (RCC) dam.Ulu Jelai is being developed by Tenaga Nasional Berhad (TNB) in Pahang state, approximately 200km north of the capital Kuala Lumpur. It is one of five hydro projects being built at present to help stabilise the power grid.The project is located on Bertam River, and involves major dam and tunnel works. The rated net head of the scheme is approximately 360m.Key features of the project include the Susu reservoir on Bertam River, and to which water is conveyed by transfer tunnels from the Lemoi and Telom rivers, running on opposite sides of the main river. Lemoi and Telom are tributaries of Bertam and naturally join the main river downstream of the project location but are being tapped with offtake weirs at higher elevations. The tunnels have lengths of 7.5km and 8.5km, respectively.Water flows from Susu reservoir down a 9.5m-diameter unlined headrace tunnel to the underground powerhouse complex, holding a pair of 191MW Francis turbines. Ulu Jelai is expected to generate approximately 326GWh of electricity annually.Salini Impregilo is main contractor on the scheme, which is nearing completion.The Susu RCC dam is more than 80m-high with a crest length of 512.5m. Its volume is approximately 750,000m3, the contractor said.The volume of other concrete works on the project is approximately 190,000m3. Surface excavations and earth moving has involved more than 3M m3 of material.Underground construction has been performed by both TBM boring and drill and blast excavation. In total, the project has called for excavation of 26km of tunnels and also the powerhouse cavern complex. The TBMs were used to bore 15km of tunnels, and 11km of excavation of undertaken by drill and blast.Salini Impregilo notes that the total underground rock excavation is approximately 800,000m3.
A consortium led by Ferrovial Agroman has been awarded a contract by Iberdrola to construct the Daivoes dam and hydroelectric plant on the Támega River in northern Portugal.Estimated to cost more than €90M, the project will include the construction of a concrete arch-gravity dam 77.5m high and 264m long, together with a power plant housing two turbines with a total installed capacity of 118MW.Under the contract, Ferrovial will also construct a 388m tunnel to divert the river, and a weir 71m long and 10.5m high, located 2.2km downstream of the dam.Work on the project is set to be complete in around 56 months.Daivoes is the first of four main contracts to be awarded by Iberdrola as part of the Támega river hydroelectric project and is the second to be delivered by Ferrovial Agroman for the utility in Portugal.