WORK has started on restoring the remaining three generating units at the Callide Power Station, following the major failure of the Callide C4 unit after a fire and explosion on Tuesday 25 May.
The fire occurred in the Turbine Hall for Callide C4 at the Biloela Power station and subsequently both Callide C units and 1 Callide B unit tripped and came offline.
The incident resulted in widespread power outages across the state, with about 400,000 homes and businesses affected.
The site was evacuated with all 236 personnel accounted for with no injuries.
The C4 unit is expected to be out of action for 12 months, with CS Energy planning to rebuild the unit.
When will the units be back online?
The Australian Energy Market Operator (AEMO) has been informed of the revised dates for the return of three generating units at Callide Power Station.
CS Energy has informed the AEMO that Unit B1 will be returned to service on 11 June and B2 on 21 June.
CS Energy owns 100 per cent of Callide B, while it owns Callide C in a 50/50 joint venture (JV) with InterGen.
Callide Power Trading, which trades the output of Callide C on behalf of the JV, has informed AEMO that Unit C3 will return to service on 22 June.
CEO Andrew Bills said CS Energy's first priority was safety as crews work to bring the three generating units back online after the plant incident on Unit C4 last week.
"There are currently 60 to 70 people working on site. Following risk assessments we will look to increase this as the week progresses," Mr Bills said.
"However, we will not rush this process - we are following our methodical safety procedures at every step."
What will happen to damaged Unit C4?
CS Energy announced there was no change made to the forecast return date for C4 of 12 months' time.
Mr Bills, who is returning to Callide on Thursday, said it was CS Energy's intention to rebuild Unit C4.
Through the JV arrangement with InterGen, CS Energy operates Callide C and provides several services to the JV, including maintenance services.Callide Power Station has a permanent workforce of 260 people.
Mr Bills said it was too early to pin point the true cause of the fire and explosion in Unit C4, and that investigations were ongoing.
"It is too early to speculate as to the cause of the incident and we need to undertake a thorough and comprehensive investigation working with all authorities and regulators to determine the cause of this incident," he said.
"There will be multiple stakeholders investigating what has occurred at Callide and we need to ensure it is a coordinated, comprehensive and independent process."