Within weeks of Ethiopia’s inauguration of the 420-megawatt Gilgel Gibe II hydro plant by Prime Minister Meles Zenawi in January, a 15-meter section of its head-race tunnel collapsed. Italian engineers have begun reinstalling lights and ventilation to prepare for months of work to get water flowing again. Photo: Salini Costruttori S.p.A. One 15-meter section of the concrete-lined tunnel collapsed. The remainder of 26-km-long head-race channel is in “perfect” condition, the contractor says. According to the project’s main contractor, Rome-based Salini Costruttori S.p.A., the rest of the 26-km head-race tunnel is in “perfect” condition. The collapse site, about 10 km upstream
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.