What's the bar for ecological spending? They should use more expensive energy solutions than say America? Why? I'd criticize each American coal plant in turn, before turning to blame 3rd-world development.
I don't know exactly where the bar is, but I would propose that it lies somewhere above the point where going outside makes your eyes and nose burn because the air is so awful.
The US is not some magical pollution-free paradise, but at least the air is comfortably breathable here 365 days a year in most places.
It's amusing when the authorities put out an air quality alert here in the DC area. It's important for sensitive populations, but it's almost impossible for a normal person to even notice the difference. A code red air quality day in DC would be a delightfully clear and clean day in Beijing.
They should use cleaner energy solutions because they're killing a shitload of people right now. Dirty coal is only cheaper if you ignore the costs imposed by the pollution.
And that's the situation in Ethiopia? I'm not sure it is. So again, they're using a cost-sensitive solution with possibly little ecological impact, in comparison to the rest of the world anyway.
The plants aren't built yet, so you wouldn't expect to see their impact yet. If you want to see what it might look like, look at another place where similar things are already built.