In#160;sub-Saharan Africa, where more than 600 million people still#160;lack access to electricity, off-grid renewable power is seen as#160;one of the fastest ways to get energy where#160;it's needed,#160;particularly to remote and rural areas where many Africans live.#160; But a big challenge stands in the way, experts say: a lack of trained workers able to plan, install and maintain solar,#160;wind and other clean energy systems.#160; In power-hungry Goma, Democratic Republic#160;of the Congo, for instance, we've#160;had very significant challenges#160;finding very capable talent, particularly at the senior#160;management#160;level, said Kweku#160;Yankson, head of human...