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Wednesday, 14 November 2018

The Grand Ethiopian Renaissance Dam Gets Set to Open

(IEEE Spectrum) Construction of the 6,000-megawatt, US $5 billion Grand Ethiopian Renaissance Dam (GERD) began nearly six years ago and is now close to completion.

Sometime in 2017, the dam, which sits on the Blue Nile near the border of Ethiopia and Sudan, will begin producing electricity. Meanwhile, its vast 74 billion-cubic-meter reservoir will start to fill, a process expected to take anywhere from five to 15 years.
Ethiopia badly needs it. Only about a quarter of its citizens have access to electricity. The country’s installed capacity is a dismal 3,200 MW, and the annual per capita electricity consumption is among the lowest in the world—65 kilowatt-hours in 2013, far below even the average of 488 kWh for sub-Saharan African countries and the world average of 3,104 kWh. Without electricity, the vast majority of Ethiopians rely on burning wood, dung, and other forms of biomass, and so deforestation and soil erosion has accelerated.
Given the country’s natural resources, there is no need for this impoverishment. According to energy experts, Ethiopia has the second highest hydropower potential in Africa, with an estimated capacity of about 45,000 MW. The GERD, as well as the 1,870-MW Gilgel Gibe III Dam completed in 2015, will nearly quadruple Ethiopia’s electricity capacity. Excess electricity will be exported to other African countries and even to Europe and could eventually earn Ethiopia about $1 billion per year, which would make it the largest electricity exporter in Africa.
Among the dam’s other expected benefits are a steadier flow of water through the dry season and less flooding in the rainy season. That regulating influence could be especially helpful as climate change makes East Africa’s rainfall more unpredictable.
Based on his calculations, 2,000 MW would have been a more reasonable rating for the dam. Back in the early 1960s, in fact, the U.S. Bureau of Reclamation had recommended building a “border dam” of about that size in the same location. But the border dam’s proposed reservoir was less than one-fifth of the GERD reservoir’s 74 billion cubic meters, and the dam itself was less than half as high as GERD’s 155 meters. Of course, building a large reservoir is one thing; filling it, and keeping it filled, is quite another. If the severe drought that devastated parts of Ethiopia in 2016 spreads to the region near the dam, the reservoir will fill very slowly indeed.
The proper sizing of the dam is more than just a numbers issue, Beyene adds. “Because the dam is oversized by 300 percent, the dam’s powerhouse as well as new transmission lines will also be oversized, which will greatly inflate construction costs.” He questions the fact that the prominent Italian company, Salini Impreglio, that is building the dam also did the feasibility study for the dam: “In the United States, that’s a no-no; it’s a clear conflict of interest.” Salini and the state utility, Ethiopian Electric Power, did not respond to several requests for interviews.
The price difference for the turbines alone could amount to $1 billion, Beyene estimates. That money could be better spent on other infrastructure, including facilities to exploit Ethiopia’s considerable wind, solar, and geothermal resources. But with construction of GERD nearly finished, there’s little chance of scaling back the project now. His hope is that any future projects on this scale will get more scrutiny. “Hopefully, the country will come together and things will change,” Beyene says.