Emergency crews are at the scene of a fire reported in a building at the Howard and Sons pyrotechnics factory at Pipers Flat.
Police and fire brigade units from Wallerawang and Lithgow are at the scene and police have closed the Pipers Flat road between Wang and Portland.
Initial reports indicated that the fire has been contained.
No further details are available.
The factory was a scene of major drama at Christmas 2009 when a major explosion occurred in a fireworks storage container.
Full details in Saturday's Lithgow Mercury.