Where are you getting Uganda having an agricultural export of 3.9 billion? It should be about half that, their total export should amount to that number you stated, with gold exports alone being 2 billion, or roughly 50% of their export value in USD. Just post where your getting your data from and I'll do the same from here on out.
They're headquartered in Nairobi, Kenya. Somalia is just one of the regional countries they operate in. It's stated so on the front page of their website.
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Ethiopia's leadership hopes to transition from an agriculture based economy to a light manufacturing export based economy. They're constantly dealing with power outages with their currently electricity capacity, so even without their attempt to pivot to a light manufacturing export based economy they would still need to bring online additional power capacity, or continue suffering power outages with all it's negative effects to the economy. Building a dam that more than doubles the electricity generation of a country and calling it a waste with minimal return flies in the face of all logic.