Cooling towers operate at the Hendrina power station, operated by Eskom Holdings SOC Ltd., in Middelburg, South Africa, on Wednesday, April 13, 2016. Creditors of Glencore's Optimum Coal mine approved a plan to sell it to a company controlled by South African President Jacob Zuma's son and the Gupta family on Friday, according to an administrator of the business-rescue team. Photographer: Waldo Swiegers/Bloomberg via Getty Images