The new president of the African Development Bank (AfDB) Akinwumi Adesina (L) of Nigeria and Ivory Coast's President Alassane Ouattara attend Adesina's investiture ceremony in Abidjan on September 1, 2015. The AfDB will focus in coming years on tackling Africa's chronic power shortages to try to unlock its economic potential and end its vulnerability to fluctuations in commodity prices, Adesina said. REUTERS/Luc Gnago