Herald: With back-to-back droughts since 2013, Zimbabwes main hydroelectric power plant at Kariba is failing, forcing the southern African nation to turn to dirtier fossil fuel-based energies to make up for the deficit. The Kariba Hydropower Station is capacitated to generate 750 megawatts of electricity, but the plant has operated at just 63 percent of capacity since early October when the Kariba dam began to dry up. In good times, hydropower accounts for over 50 percent of...