Police have clashed with striking workers at various hostels housing construction workers of Medupi Power Station in Limpopo.
The workers had barricaded the streets and entrances to the hostels preventing buses to pick up workers to the construction site.
They are burning tyres and pelting stones at motorists.
Police nyalas and water tankers have been deployed in the area.
On Tuesday the striking workers refused Eskom’s offer to return to work on Wednesday.
The workers are demanding that those dismissed be reinstated unconditionally.
The utility had on Tuesday confirmed it will reinstate the 1 700 workers who were fired for vandalising property during the strike.
Labour disruption and technical faults have increased costs at Eskom’s Medupi coal-fired plant, expected to start generating 800 megawatts of extra electricity by July.
Meanwhile Eskom implemented stage 2 load shedding from 06:00 on Wednesday morning.
This followed stage 2 and stage 3 load shedding on Tuesday, with Eskom assuring customers that load shedding is implemented as a necessary measure to protect the power system.
Deferred generator maintenance has caused an overload of unplanned repairs, resulting in a week of darkness for South Africa.