Reuters: gypt, Sudan and Ethiopia commissioned studies into the environmental and economic impact of a $4 billion dam on the Nile that Addis Ababa aims to make the centerpiece of its bid to become Africa's biggest power exporter. The 6,000-megawatt Grand Renaissance Dam, situated close to Ethiopia's border with Sudan and being built by Italy's largest construction firm Salini Impregilo SpA, is due for completion next year. It has become a bone of contention between Ethiopia and Egypt, downstream from the...