An employee at the Afam VI power plant talks on a walkie-talkie at the plant in Port Harcourt on September 29, 2015. Afam VI power plant is owned by the Shell Petroleum Development Company of Nigeria (SPDC) and maintained by Dietsmann company. Nigeria is Africa's largest producer, accounting for roughly two million barrels of crude daily. Shell has blamed repeated oil thefts and sabotage of key pipelines as the major cause of spills and pollution in the oil-producing region. AFP PHOTO / FLORIAN PLAUCHEUR        (Photo credit should read FLORIAN PLAUCHEUR/AFP/Getty Images)