Johannesburg - Cosira, a contractor involved in Eskom's Kusile power station project, has applied for business rescue, Business Day reported on Tuesday.
Cosira director Andris Bertulis said on the company's website last week that the board had voluntarily begun business rescue proceedings.
The company is one of South Africa's larger privately-owned structural steel companies.
According to the report, Cosira's holding company, First Tech, had not responded to questions by the newspaper about the progress and details of the business rescue, nor its effect on the timing of Kusile's commissioning.
Cosira was part of a joint venture with French multinational, Alstom, in the construction of a steam turbine hall for the power station in Mpumalanga.
Eskom referred all Business Day's questions to Alstom. The company had not responded to questions.
Kusile is expected to add 4 800 megawatts to the power grid.
Construction of Kusile, due to start up in late 2014, has also been disrupted by labour unrest, Reuters reported.
Two-thousand contract workers at the Kusile power plant were fired after staff went on the rampage at the site in May, officials told Parliament's portfolio committee on labour.
It also faced protest action by Greenpeace activists who said the coal-fired power station is not needed in the country.
Eskom considered sacking key contractors at its Medupi and Kusile power plants due to sub-standard work and delays, CEO Brian Dames said in March.