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“Persistent, clustered breakdowns:” Coal clunkers fail the grid with 119 outages
9 DECEMBER 2025 2:52 PMThe fleet of remaining coal-fired power plants on Australia’s main grid suffered a combined 119 breakdowns, or unscheduled outages, over the past six months, new data has revealed, and were out of action for an average of 22 per cent of that time.
The analysis from Reliability Watch is its latest report using data submitted to the Australian Energy Market Operator (AEMO) on the capacity coal plants have available to the National Electricity Market (NEM) every five minutes.
The report shows that at the beginning of April, 2025, the 15 coal plants spread across Queensland, New South Wales and Victoria submitted 23 planned maintenance shutdowns for the period until the end of September.
But instead of the 23 outages expected by AEMO, there were actually 142 outages – including 119 breakdowns – over the six months.
All told, the coal plants were unavailable to meet their generation commitments 22 per cent of the time, the report says. This means an average of 4.7 gigawatts (GW) of electricity generation capacity was not available to the NEM on any given day.





