London — GreenWish Partners, a renewable energy company run by a former Morgan Stanley executive, is planning to invest $800m on solar-powered telephone towers across Africa. The project could fuel economic growth by providing power for essential services. Sub-Saharan Africa has the lowest rates of energy access in the world and is home to about half of the world’s 1.2-billion people without reliable electricity, according to the International Energy Agency. The problem extends to businesses as well as households, cutting into productivity and growth. "We reduce the total cost of power by 30%," said Charlotte Aubin-Kalaidjian, the founder and CEO of GreenWish, who was formerly an MD director at Morgan Stanley Investment Management. "Smaller towers can run entirely on solar and battery and larger ones reduce their diesel use by at least 60%." Africa has more than 240,000 cellphone towers, most powered by diesel generators as they are often attached to unreliable grids or are in remot...

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