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Upgrading and refurbishment
First unit installed at Stvanice in Prague, Czech Republic
Hydropower & Dams
Installation of the first unit began in January 2018 with full commissioning in March 2018 and performance testing completed in July 2018.
Mavel has successfully installed, tested and commissioned the first of three units at the Stvanice hydroelectric plant on the river Vltava in Prague, the capital of the Czech Republic.
The output of the new double regulated Kaplan "S" turbine exceeded guaranteed values by more than 25 per cent, the Czech-based water-to-wire supplier announced on 8 August. Prior to refurbishment the maximum power per unit was 1.6 MW. Mavel's contract mandated a guaranteed output of 1.75 MW. The new turbine reached 2.1 MW before output was reduced owing to the capacity limitations of the existing generator. Installation of the first unit began in January this year, with full commissioning in March and performance testing completed in July. Installation of the second unit is expected to be completed in September with the third and final unit to be commissioned in May 2019.
Mavel is carrying out the complete rehabilitation of the plant, including mechanical and hydraulic design, replacement of three horizontal turbines, refurbishment of generators, supply of a control system and all related civil work, under an engineering, procurement and construction (EPC) contract awarded by Czech water management authority Povodi Vltavy in August 2017 (see H&D Issue 3, 2017). Stvanice was commissioned in 1914 before being decommissioned in 1972. The plant was then renovated and brought back into operation in 1987 but the efficiency of three 'S' Kaplan turbines at the renovated plant, which operate with a flow capacity of 44 m3/s under an head of just less than four m, have since declined while the operator has seen increasing problems with the bearings. Using computational fluid dynamics (CFD) modelling, Mavel said it had found that reversing the rotational direction of the turbine would maximize the energy potential and minimize losses in the inlet and draft tube. Mavel developed a new hydraulic design for the turbine customized for the specific hydraulic parameters and requirements of the plant. The first of the new four-blade horizontal Kaplan turbines, with a runner diameter of 3400 mm, was installed with a counterclockwise rotational direction. The solution allowed for the use of the existing generators, which were refurbished and also adapted for the directional change.
Request for Expressions of Interest ~ ARAZA HYDRO POWER PLANT
EDF Perú S.A.C. and Electro Araza S.A.C. (the 'Sponsors') are developing a hydropower project, which will have a total installed capacity of 195 MW, on the Araza river in the Cusco region of Peru, (Quispicancha province, Marcapata y Camanti district). The Araza Hydro Power Plant project, will consist of three hydropower plants: In preparation for the competitive tendering process scheduled to begin in May 2021, the Sponsors would like to invite eligible firms to submit an expression of interest (EOI) for carrying out the works necessary for the implementation of the Araza project.
Pre-qualification launched for Ruzizi III EPC contractor
Ruzizi III Energy invites pre-qualification bids by 15 February 2021 for the engineering, procurement, construction, testing and commissioning of the Ruzizi III regional hydropower project on the border of DRC and Rwanda.
Investors sought for 100-150 MW project on Lualaba, DRC
The Ministry of Hydraulic Resources and Electricity of the Democratic Republic of Congo has launched a two-stage tender for the selection of a private sector developer to build and operate under a long-term concession a 100 -150 MW hydropower station at the Nzilo 2 site on the Lualaba river, in the southern province of Lualaba.
Lenders' technical advisor sought for Lesotho Highland Water Project Phase 2
The Lesotho Highland Water Project Phase 2 is being co-financed by the AFDB and is a bi-national project between the governments of Lesotho and South Africa.
Andritz to modernize Nurek in Tajikistan
Bids were invited in late 2017 for the full rehabilitation of the 3015 MW Nurek scheme.
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