Invitation for prequalification, deadline 4th November, 2005 for the Halele-Werabesa hydroelectric power project in southern Ethiopia. Stage I of the scheme includes, amongst other structures, a 400 m-long 12 m-diameter river diversion tunnel; a chute spillway of about 250 m; a power intake and a concrete-lined headrace tunnel (diameter 6 m and 365 m in length); a tailrace surge chamber and an invert-lined tailrace tunnel (D-shaped, 8.05 m/7.8 m) of about 5,000 m; an underground powerhouse (length 60 m, width 20 m, height 36 m); and several access tunnels and shafts. Stage II includes, in particular, a power intake and a concrete-lined headrace tunnel (diameter 7.8 m) of about 4,260 m; a 20 m-diameter surge tank; a 295 m-long headrace pressure shaft; a tailrace surge chamber and an invert-lined tailrace tunnel of about 4,090 m; an underground powerhouse (length 71 m, width 22 m, height 37 m); and several access tunnels and shafts. Visit http://ted.publications.eu.int/udl?request=Seek-Deliver&language=en&docid=165739-2005, OJ S 167, or contact Ethiopian Electric Power Corporation (EEPCO), Procurement Division, Head Office, Ground floor, De Gaulle Square, PO Box 1233, Addis Abeba, Ethiopia. Tel. +251 1560027, fax +251 1550822 or 1504050. 36/05.

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.