South Africa has been struggling for years to overhaul its state-power company which is plagued by corruption and mismanagement and reeling under a 400 billion rand ($23.3 billion) debt pile.
Finance Minister Enoch Godongwana told Reuters last week he was "sharpening his pencil" to provide details, so far scarce, for taking on between one- and two-thirds of Eskom's debt in his Feb. 22 budget presentation.
Eskom's debt pile is not just big, it is also complex.
Another 15% is international bonds, held by global asset managers such as PIMCO, BlackRock and Fidelity, according to recent filings.
Eskom's international bonds could rally if the government takes on two-thirds of the debt, Wolman said, while limiting that to one third or carrying out the debt transfer over a long period of time could be negative.