What is the Green Africa project? The irrigating the whole of Africa from the great rivers.
Such a project was realized and was viable (during the communist regime) in Romania: from the Danube River - some huge pumps sent water hundreds of kilometers away, through millions of pipes (pipelines) across the entire Romanian Plain. They were obtained huge crops of wheat, crops which were sufficient to feed the population of all Europe.
From the rivers: Nile, Niger, Congo, Senegal, Zambezi, Orange etc. and from the lakes: Chad, Victoria, Tanganyika, Malawi, Ngami etc., through huge pumps, then through millions of pipes (large pipes, medium pipes, small pipes) to great distances, we can send water to vast African territories.
These giant pumps can be supplied with electricity from the power lines of various countries (Egypt, Sudan, Ethiopia, Chad, Kenya, Somalia, Uganda, Rwanda, Burundi, Mali, Guinea, Mauritania, Senegal, Ivory Coast, Benin, Niger, Cameroon, Central African Republic, Zaire, Congo, Tanzania, Zambia, Botswana, Zimbabwe, Mozambique, the Republic of South Africa, Namibia, etc.) or very powerful Diesel engines will be installed (near pumps) which will drive some power generators which will produce alternating electric current (220 volts or 380 volts) (so, converters to produce electric current) which will drive huge pumps.