Eskom Holdings Power Station in Delmas

Eskom Holdings Power Station in Delmas

Nadine Hutton/Bloomberg

Electricity power lines and cooling towers are seen at an Eskom Holdings Ltd. power station in Delmas. Eskom’s role as supplier of 95 percent of the country’s electricity makes any walkout by its workers illegal, said Andrew Etzinger, a spokesman for the Johannesburg-based utility.