Numsa wants full disclosure from Eskom on the so-called "war room", and it believes that the electricity crisis is due to multi-million contracts.
Numsa calls for inquiry into Eskom and says it must open its books for public scrutiny.
Technological innovation that affects consumer behaviour and a shift to renewable energy are at the heart of the upheaval facing utilities.
The acting chief executive plans to find 3000MW of additional capacity by the end of the year to minimise the need for load shedding.
The ConCourt has ruled that state organs, as employers, have to take over the employment contracts of workers - if a contract or tender is cancelled.
Power load shedding could last up to 12 hours at a time, as giant aluminium smelters consume discounted electricity with abandon.
South Africa will build an additional 6 300 megawatts of renewable energy, adding to the 5 200 megawatts already being procured.
South Africans can expect load shedding to continue during the cold months as Eskom plans to forge ahead with maintenance at its power plants.
Workers are considering Eskom's offer to reinstate them even though working conditions at the Medupi power plant have not yet been addressed.
South Africa's treasury has withheld R2-billion from 60 municipalities that owe the electricity parastatal R9-billion.
According to the department of energy "there is no need to panic at this stage" as petrol is still cheaper than a year ago.
After a three hour board meeting Eskom chairperson Zola Tsotsi has resigned.
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.
Eskom chairperson Zola Tsotsi says the President backed him when he said he wanted to set up an inquiry to investigate "rot" at the power utility.
Animosity boils over after battle for control of crucial commercial procurement division
Critical decisions are on hold as top bosses battle it out and other employees fear layoffs.