In this file photo taken on December 26, 2019 A worker goes down a construction ladder at the Grand Ethiopian Renaissance Dam (GERD), near Guba in Ethiopia. - Ethiopia will start generating power from its controversial mega-dam on the Blue Nile on Sunday, government officials told AFP. The Grand Ethiopian Renaissance Dam (GERD), set to be the largest hydroelectric project in Africa, has been at the centre of a regional dispute ever since Ethiopia broke ground in 2011. (Photo by EDUARDO SOTERAS / AFP)