Eskom chief financial officer Calib Cassim has been appointed as interim CEO following the abrupt departure of André de Ruyter, the power utility announced on Friday morning. De Ruyter was initially set to leave Eskom at the end of March, but late on Tuesday night, it was announced that he was out with immediate effect. This followed an explosive interview in which De Ruyter said a "senior politician" was involved in corruption at Eskom.