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Coal may be cheap in the USA, but even here shipping that coal is a huge fraction of the cost the coal. This is why, for example, there is currently a push underway for Dakota, Minnesota, and Eastern Railroad (which is merging with Canadian Pacific) to get government subsidies to expand it lines connecting Wyoming coal mines with the Eastern US.
For a country with no coal reserves, building coal plants may not make any sense. Though I agree with other that Senegal should probably be looking into solar power, nuclear power may make sense as well. Uranium prices may be rising, but the cost of uranium is a relatively small part of the cost of a nuclear power plant.