That dam is not 100% built yet so it's only going to yield a fraction of the electricity that the article cited.
The dam is completed, and it's already filled for production levels, the flooding of the basin has started in 2020:
https://eros.usgs.gov/earthshots/grand-ethiopian-renaissance-dam-ethiopiaIt does have only 700MW out of 5GW installed, but the trick is that the powerplant would have never produced that much, it has a capacity power below 30% so 2 turbines running full time will have the same effect as 6 installed over the year with the current debit being released.
And have you also thought about it that, as more miners increase, the higher the worth and reward value for their successful mined block.
Nope, that's not how economics work!
Otherwise, we would all just buy miners, dive the hashrate to 1 quadrillion exahashes and suddenly the Bitcoin price will be 2 trillion!
No, more miners doesn't mean higher prices!