Ethiopia's megadam: Energy revolution and diplomatic crisis

An aerial view Grand Ethiopian Renaissance Dam on the Blue Nile River in Guba, northwest Ethiopia. [AFP]

Ethiopia's Grand Renaissance Dam (GERD), Africa's largest hydroelectric project being inaugurated Tuesday, promises an "energy revolution" for the country but has been a source of deep tensions with neighbouring Egypt for more than a decade.

For Ethiopia, the dam is a national project of historic scale and a rare unifying symbol in a country torn apart by ongoing internal conflicts.