By Pavithra Rao - Ethiopia’s ambitious plan to build a $4.2 billion dam in the Benishangul-Gumuz region, 40 kms from its border with Sudan, is expected to provide 6,000 megawatts of electricity, enough for its population plus some excess it can sell to neighbouring countries. Dubbed the Grand Ethiopian Renaissance Dam, it will be Africa’s biggest dam and will depend on water from the 6,700-km Nile River, the world’s longest river.