Karpowership, the Turkish company seeking to supply power to South Africa, said it will demand a retraction from Andre de Ruyter, the former chief executive officer of Eskom Holdings SOC Ltd., because it said he had inferred the firm was corrupt. The company, which generates electricity from ship-mounted, gas-fired power plants, in 2021 won about 60% of an emergency tender seeking to secure 2,000 megawatts of power to ease shortages that have plagued South Africa for almost 15 years. Court challenges from rival bidders and environmentalists and a yet-to-be resolved delay in getting Eskom, the national power utility, to sign a power-purchase agreement have stalled the deal.