Overall management of 2 x 50 MW first phase awarded by EEPC to Lahmeyer International to include two diversion tunnels for a start in 1999 for commissioning late-2003. March 1999.Invitation to prequalify, deadline 12th April, 2004 for the civil works of lot 2/3 of the Gojeb hydroelectric power project. The required underground works include two 6.8 m-diameter diversion tunnels, 678 m and 740 m in length, and a 540 m-long power tunnel and its 50 m-deep 7 m-inner diameter vertical shaft. Work start of diversion tunnels is June 2005, time frame: 430 days. Work start for the power tunnel: January 2007, time frame: 500 days. Drill/blast method. Primary lining with lattice girders, steel arches, shotcrete, welded mesh, anchoring bolts, spiles and ground treatment. Secondary lining will consist of cast in situ concrete formwork, 20 cm to 75 cm in thickness. All tunnels on the right bank of the Gojeb river. The rocks in the vicinity of the site are from the Oligocene and Miocene and are known as the Trap series. The Trap series is the result of volcanic activity and consists of interlayered lava flows of basalts, andesites, trachytes, rhyolites and pyroclastic rocks. Financing by Ethiopian Electric Power Corporation (EEPCO) and European Investment Bank. Visit http://ted.publications.eu.int/udl?request=Seek-Deliver&language=en&docid=023141-2004, OJ S 27, or contact EEPCO, Purchasing Division, De Gaulle Square, PO Box 1233, Addis Abeba, Ethiopia. Fax +251 1550822. 10/04.