*16% of Africa's electricity is generated by hydro-power; in some countries, such as DR Congo, Uganda and Ethiopia, it provides almost all the available electricity.
*Only 7% of Africa's Hydro-power potential has been developed - compared to 33% globally and 65% in Europe.
* African rivers with the largest potential are the Congo, the Nile and the Zambezi.
*The proposed Grand Inga project on the Congo could produce 40,000 megawatts, enough to provide electricity for much of Africa.
*Hydro-power is a clean and renewable source of energy, but there can be environmental side-effects, such as flooding of valleys behind dams, and reducing fish supplies down-stream.
*Another renewable source of energy with untapped potential in Africa is wind power.
*Small-scale projects are being tried out, where wind-turbines are built to provide small towns and villages with electricity, for example in M'muock in Cameroon.
*In northern Europe, huge wind-farms account for 20% of Denmark's electricity, studies suggest the African countries with the most potential are Madagascar, South Africa, Kenya, and Ethiopia.
*The more wind turbines are produced, the more the price comes down wind-powered energy costs just a fifth of what it did 25 years ago.
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