The Greens could hold the balance of power in NSW if Labor fails to form a majority government but the third party says their support is not automatic, even though they would like to kick the Coalition out.
NSW Greens MLC Cate Faehrmann said she was "very confident that we are going to see a very similar result for the Greens at the state election as we saw in the federal election".
She was speaking on election eve surrounded by other Greens MPs and candidates including Kobi Shetty in the crucial inner Sydney seat of Balmain.
The Greens scored major electoral wins in last year's federal elections, picking up seats in Queensland.
"We know this election is going to be very tight and more voters are choosing to turn away from the major parties and come to the Greens," Ms Faehrmann told reporters on Friday.
In a pointed message to both Premier Dominic Perrottet and Labor leader Chis Minns, Greens MP Jenny Leong said the vote for the major parties was falling rapidly and "no longer can we see the idea that it's a winner-take-all approach to our democracy".
"We're absolutely committed that we want to kick this Liberal-National government out but we are also not happy and satisfied with the dark days of old NSW Labor," she said.
Ms Leong said Labor's campaign for Balmain, which the opposition is gunning hard to win, has been marred by misinformation such as saying the Greens and Liberals were cutting a preferencing deal.
The Greens are hoping to retain three lower house seats - Newtown, held by Ms Leong, Ballina held by Tamara Smith and the inner-Sydney seat of Balmain where Ms Shetty is hoping to replace the retiring Jamie Parker as the Greens MP in the former Labor stronghold.
The party is also hopeful of gaining ground with 26-year-old Izabella Antoniou in another inner-city seat of Summer Hill, where they are preferencing Animal Justice Party candidate Sandra Haddad above Labor incumbent Jo Haylen.
They are also pushing for Lynda-June Coe, a Wiradjuri and Badu Island woman running for the Greens in the upper house, to be elected in an historic first.
Ms Faehrmann said the Greens support for a Labor government would be contingent on implementing a cashless gaming card, which Mr Minns has been resistant to accepting, opting instead for a limited trial of 500 poker machines statewide.
