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East Africa is experiencing a green energy revolution as two very different technologies emerge to pump megawatts into the grid and chase the darkness from rural homes. The biggest engineering project in Kenya is releasing superheated steam from beneath the Rift Valley, as geothermal energy expands to satisfy the power hungry. And the African Sun is lighting the night as plummeting costs and rising performance mean solar lamps cost as little as a hen yet last for years: sales are soaring.