Eskom Holdings’s risk premium is dwindling as a turnaround at South Africa’s State-owned electricity company gathers momentum. The extra yield investors demand to take on the risk of holding the utility’s dollar debt without the benefit of a government guarantee narrowed to the lowest on record following the publication of the utility’s results on Thursday. And the yield premium over comparable US Treasuries is also at the lowest since the Eskom securities were issued in 2018.