Vic mine arsonist hunt progressing: police

Victoria's police chief says counter-terrorism measures must be revisited to protect power supplies from being targeted as the hunt for the arsonist who lit a coal mine fire continues.

Chief Commissioner Ken Lay says the state's counter-terrorism plan and the security of the entire power industry need to be looked at, with significant fires lit around electricity plants in the Latrobe Valley in the past month.

A deliberately-lit blaze that spread into the Hazelwood open-cut mine in Morwell on February 9 continues to burn but firefighters have stopped it from getting into the nearby power station.

Mr Lay said fire is a significant risk to the state's power supply.

"We need to make sure that every possible step is taken to protect this infrastructure," Mr Lay told reporters in Morwell on Friday.

"We'll revisit those plans, we'll talk to people right across the world about what the best security overlays are to ensure that the electricity supply remains intact."

Mr Lay says police have a number of positive leads in the hunt for the person who set the Morwell fire.

Police received more than 100 additional pieces of information in the past week after appealing for public help to find the arsonist.

"We have a number of very positive leads that we are pursuing," Mr Lay said.

The size of the taskforce investigating the fire has also been increased, from four to 10 detectives.