Firefighters have returned to the recycling plant at Pialligo to respond to a small fire.
The fire is 5m by 6m and located in the same pile that crews attended to earlier this week.
ACT Fire & Rescue and the ACT Rural Fire Service has 10 units on scene. One bulldozer has also been called in to help move the mulch.
People near Pialligo may notice some additional smoke in the area.