2015年09月07日 01時00分 JST | 更新 2016年09月05日 18時12分 JST
TONY KARUMBA via Getty Images
A plume of steam billows overhead, from a newly drilled well in the rear, above ol-Karia gorge hosting several geothermal power generation plants on the floor of the Kenyan Rift Valley, near the shores of Lake Naivasha, some 120 kilometers north-east of capital, Nairobi, August 28, 2015. Kenyas installed steam power capacity now stands at 579MW, ahead of giant economies such as Japan, Russia, China and Germany according to a study presented to the World Bank by state-owned KenGen, with ambitions to scale up to 5,000 megawatts by 2030 Olkaria is one of the largest single geothermal investment projects in the world and geothermal the largest source of electricity for Kenya today, accounting for a mere 13% of the national grid in 2010, after hydro-energy. AFP PHOTO/TONY KARUMBA (Photo credit should read TONY KARUMBA/AFP/Getty Images)