Fire and Rescue NSW crews were called to the Bolong Road complex around 12.52pm after automatic fire alarm systems activated.

Fire and Rescue NSW crews from Shoalhaven 440, Nowra 405 and Berry 224 brigades attended with three fire tankers.

A spokesperson for FRNSW said the fire was detected in part of a pellet processing plant within the complex and had been brought under control.

"There was a fire involving product on a conveyor belt," the spokesperson said.

"The fire was detected on the second level of a three-story factory building."

Fire crews established a command post to the west of the complex.

Around 15 FRNSW personnel attended the scene, with firefighters wearing breathing apparatus, entered the building, located and extinguished the fire.

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Crews continued to douse the conveyor belt and cool the smouldering products with water.

Manildra's on-site electrical team isolated power to the building.

Fire crews undertook cooling operations across three levels of the complex, with the location handed back to the onsite fire control around 2pm.

There are no reports of injuries during the incident, however NSW Ambulance crews were called to the area as a precaution for firefighters' welfare.

Two Hazmat units are also en route from Shellharbour.

The incident comes as fire crews, both Fire and Rescue NSW and NSW Rural Fire Service have been been in action for days, battling large fires in the southern Shoalhaven and in the Braidwood area.