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CEZ tenders modernization of Orlik

CEZ, the Czech Republic’s state-controlled power utility, invites bids by 31 May for the refurbishment of all four 91 MW units of the 364 MW Orlik hydropower plant on the Vltava river. The tender calls for the complete design, supply, disassembly and assembly of the turbine and generator parts of the TG1-TG4 units, including auxiliary equipment, technological equipment at the inlet and outlet, supply of all electrical parts, I&C and electrical protection, including testing and re-commissioning. The modernization of the plant, which is expected to increase efficiency by around 4 per cent, is scheduled to take place in stages between January 2023 and April 2030.

The Orlik hydroelectric power station forms a fundamental part of the Vltava Cascade providing peak load power for the grid and regulating the country’s power system. Commissioned between 1960 and 1961, it is equipped with four fully automatic sets of Kaplan turbines with eight-blade runners, which operate under a head of 70.5 m. The power station is located in the left part of the river at the toe of a 91.5 m high concrete gravity concrete dam that impounds a reservoir with a maximum storage of 720 x 106 m3 of water. The dam, which was built between 1954 and 1961, impounds the largest retention reservoir in the Czech Republic, and, together with the Lipno reservoir, is crucial for the long-term water flow regulation of the Vltava river and the lower course of the Labe river. Its water surface covers an area of 26 km2; it raises the Vltava level for 70 km, the Otava level for 22 km, and the Lužnice level for 7 km from its confluence with the Vltava river. The water is supplied to the units by four steel pipelines, 6250 mm in diameter, that are embedded in the concrete of the dam. The intake is equipped with quick-operating closing valves and emergency stop logs.

The procurement documents are available for unrestricted and full direct access, free of charge, at: https://nen.nipez.cz/Zadavaci_postup/N006-21-V00007822. Tenders or requests to participate must be submitted electronically via: https://portalnen.nipez.cz/. For further information, contact Romana Vašková; E-mail: romana.vaskova@cez.cz; Tel.: +420 211026263; www.cez.cz

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