Johannesburg - Workers at Eskom's Matla power station in Mpumalanga returned to work on Tuesday after a one-day strike, Eskom said.
"The power station carried on producing power and is at normal capacity today [Tuesday]," spokesperson Hilary Joffe said.
Workers downed tools on Monday when wage talks stalled and were referred to the Commission for Conciliation, Mediation, and Arbitration.
Eskom was monitoring the situation at Matla. The power station was quiet on Tuesday.
Business Day reported that 700 people were employed at the power plant, which had an output of 3600MW.
Joffe said the wage talks deadlocked because the three unions involved in the negotiations - the National Union of Mineworkers (NUM), the National Union of Metalworkers of SA (Numsa), and Solidarity - had not budged from their initial demands since May.
Eskom was offering a 5.6% increase, which fell short of the unions' demands. Solidarity wanted a 12% wage hike and Numsa 20%.
The NUM demanded increases ranging from R3000 to R3500, depending on workers' job grades, extended to all employees covered in the bargaining unit. NUM spokesman Lesiba Seshoka declined to express the union's wage demand as a percentage, saying that workers at different levels had different needs.
In March, Congress of SA Trade Unions' general secretary Zwelinzima Vavi said at a conference on collective bargaining that the union federation wanted to move away from percentage-based pay increases to close apartheid-era wage gaps.