The new president of the African Development Bank (AfDB) Akinwumi Adesina (R) of Nigeria speaks next to Zambia's Minister of Finance Alexander Chikwanda during his investiture ceremony in Abidjan 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