A ‘control system fault’ points to one of the pieces of plant common to both units, so helps explain the coincident trip
The ‘precautionary evacuation of all personnel’ and ‘done in conjunction with Powerlink Queensland to ensure the safety of the process’ makes me curious to know more about the specifics of the control system fault
and the ‘subject to change as we learn more about the incident and any remedial work required’ suggests the return to service expectation may well shift further into the future…
Paul was one of the founders of Global-Roam in February 2000. He is currently the CEO of the company and the principal author of WattClarity. Writing for WattClarity has become a natural extension of his work in understanding the electricity market, enabling him to lead the team in developing better software for clients.
Before co-founding the company, Paul worked as a Mechanical Engineer for the Queensland Electricity Commission in the early 1990s. He also gained international experience in Japan, the United States, Canada, the UK, and Argentina as part of his ES Cornwall Memorial Scholarship.
In the most recent ST PASA data update (i.e. the one published for 21:00 Thursday 15th Jan 2026) the expected return to service for both Callide C units have been pushed back.
Given the evacuation of staff, the ‘control system fault’ may have been caused by a problem with DC systems and CS were concerned about a repeat of the events of May 2021 when C4 turbine disintegrated.
You should have pictures of C4 that blue up a couple of years ago
Given the evacuation of staff, the ‘control system fault’ may have been caused by a problem with DC systems and CS were concerned about a repeat of the events of May 2021 when C4 turbine disintegrated.