South Africa is still assessing the effect of adding interest to a 254 billion rand ($13.8 billion) debt relief package for state-owned Eskom Holdings SOC Ltd. as the company prepares to split into three, according to a National Treasury official.

Treasury announced in last week’s budget that it would convert the loans in the deal announced in February from interest free to interest bearing — at a rate yet to be determined — to better reflect the cost of the arrangement.