Forty specialist police officers will work full-time on bushfire investigations to zero in on and profile would-be arsonists as the state continues to face the worst bushfire season in history.

The 19-year-old Strike Force Tronto has been investigating suspected arson cases since the horror season kicked off, and will now expand its remit to investigate all bushfires.

Firefighters run for safety as the Green Wattle Creek fire explodes from the bush in Orangeville, NSW, in December. Credit:Nick Moir

"A data collation and investigation plan has been developed to review the cause and impacts of the more than 1700 bushfires already reported to police; and consider the 12,000 fires recorded by the Rural Fire Service since August 2019," police said in a statement released on Friday.

Of those 1700, police say that 716 were deliberate lit.