It is an idea that may have found its moment. Droughts are crippling power supplies from many hydroelectric dams across Africa, with dwindling reservoirs evaporating in the hot sun. So, say researchers, why not tap that sun? Solar panels floating on the... 

Thailand plans to build the world’s largest floating solar farms to power Southeast Asia’s second-largest economy and to boost the country’s share of clean energy. State-run Electricity Generating Authority of Thailand will float 16 solar farms...