POWER utility Eskom and South Africa's Special Investigating Unit (SIU) have issued a court summons in an effort to recoup R3.8- billion rand ($221 million) they allege was diverted by former Eskom executives and the Gupta family, who ran high profile businesses in the country. The move by Eskom and the SIU relates to the 2015 acquisition of Optimum Coal by the Gupta-controlled company Tegeta Exploration and Resources. At issue is a claim by Eskom that the deal involved a payment to the Guptas which was authorised by previous executives, damaging the company financially. Eskom alleged "a concerted effort corruptly…