Numsa says its members still have to vote on Eskom's offer that they return to work, but the NUM says they have already accepted the deal.
The metalworkers union says workers at the Medupi power station were partaking in a peaceful protest after which Eskom decided to shut down the plant.
Eskom contractors fired over 1 000 workers for taking part in an "illegal" strike at the Medupi power station in Limpopo, the power utility said.
Amid another Eskom power battle, public enterprises minister Lynne Brown says all she's interested in is finding a solution to the power crisis.
The state-owned utility's inability to complete the Kusile and Medupi power plants is consuming billions of rands.
Already four years behind schedule, the Limpopo coal power station is now only projected to be fully on line by 2019 at the earliest.
Eskom spokesperson Khulu Phasiwe said that while the week looked clear on load shedding they still couldn't rule out the possibility of power cuts.
Feeling out of the loop as you return from holiday? We bring you up to date with important news you may have missed during the festive season.
Eskom has warned that its R7-billion profit will not be enough to meet its revenue shortfall over the next five years and keep the lights on.
Medupi delays have led to the utility forking out nearly R2-billion in penalties to supplier Exxaro.
At first we were told unit one of Medupi was vital to Eskom's capacity issues. But now government says its contribution would have been negligible.
Reports claim Eskom is diverting electricity to Botswana while South Africans face rolling blackouts and appeals to reduce power consumption.
The time might have come for the ANC to reconsider its investment arm Chancellor House as a commercial venture, says treasurer general Zweli Mkhize.
South Africa can expect electricity next year from coal-fired power stations Medupi in Limpopo and Kusile in Mpumalanga.
Power utility still searches for its capital division head.
A wildcat strike at Eskom's Medupi plant has turned violent, with two cars stoned and unconfirmed reports that they were set alight by protesters.
The utilityâ€™s board is still trying to find a suitable candidate to replace its finance director.
PODCAST: We find out how the setback at Eskom's Medupi power station will affect the country's power supply and economic growth.
Medupi has failed on so many levels, but will the minister carry out his 'heads will roll' threat?