A huge day in state politics in New South Wales with hundreds of thousands heading to the polls to cast their vote.

The latest Newspoll still doesn't look good for Labor who are trailing the Coalition 45 to 55 per cent two-party preferred.

Sitting premier Mike Baird seems assured of a resounding win.

Prime Minister Tony Abbott won't be fronting the TV cameras at a New South Wales polling place to cast his vote today.

Mr Abbott is in Melbourne to address the Victorian Liberal Party State Council.

He'll also be in a short security meeting to discuss aviation safety after a plane crashed in the French Alps this week.

The PM - who played a low-key role throughout the New South Wales election campaign - has cast a pre-poll vote.

New South Wales Greens MP Jamie Parker is hoping his party will win a record-breaking number of seats in the state election.

And it will only take one more upper house seat to achieve that.

Mr Parker told reporters at Rozelle Public School - where he's voting - he is hopeful the Greens will win six seats in the upper house.

Mr Parker is running a close race in Balmain against former Labor minister Verity Firth, who is attempting to reclaim her old seat.