Greens hope to take sixth upper house seat, for party record

NSW 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.

"We're hoping to gain another seat in the upper house (where) we currently have five MPs," he told reporters before placing his vote at Rozelle Public School in Sydney's inner west.

"That'll be our highest ever amount of seats.

"The last election was a record vote - the highest amount of MPs - and we're hoping to break that record this year."

Mr Parker was speaking from Balmain, where he's running a close race against former ALP minister Verity Firth, who is attempting to reclaim her old seat.

"It'll be very tight again this time but that's the wonderful thing about democracy, it keeps us all on our toes," he said.

"I'm really looking forward to seeing the result but hopeful I'll get elected for another term."

It was looking to be a close race for The Greens in the newly-created seat of Newtown as well, where Jenny Leong is being tightly contested by Labor MP Penny Sharpe.

"It's very close at the moment," Mr Parker said of the notionally Green seat.

"It'll be incredibly difficult to know the outcome until probably the next few days but we're confident we'll do a really good showing in Newtown."