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The Grand Ethiopian Renaissance Hydroelectric system will be the largest in all of Africa. Installed capacity of 6.35 GW.
The role of GERD will be to act as a stabilizing backbone of the Ethiopian national grid. There will be exports, but only if there is a total surplus of energy generated in Ethiopia. This is mainly expected to happen during rainy seasons, when there is plenty of water for hydropower generation. Ethiopia has a young population, keen to work, the second largest population in Africa, after Nigeria. Some years ago they were starving, because the rains failed.
This will also retain a lot of fresh water, flooding downstream is also expected to become at least partly manageable.
So it ticks a lot of boxes, not that downstream countries are convinced.
It concerns me that the Severn tidal barrage was ruled out in favour of Hinkley Point C. One twentieth of the U.K. need for electricity could have been supplied by the Severn barrage for the next few centuries.
Even if Point C produces 1/20 of U.K. needs that is only for half a century. Then what do you do with the poison?