South Africa’s stock exchange has not received Eskom’s interim results on time and if they are not submitted by Jan. 31 trading of the power utility’s debt may be suspended, the Johannesburg Stock Exchange (JSE) said on Monday. Cash-strapped Eskom, the sole power supplier in Africa’s most industrialised economy, has struggled after a leadership crisis and has been at the heart of allegations of illegal contracts and undue influence in awarding tenders.