Incoming Victorian premier Daniel Andrews has been warned to "green up" his platform after the Greens snared at least one lower house seat and could end up with five in the upper house.
Ellen Sandell beat Labor's Jennifer Kanis in the Melbourne district to win the minor party's first lower house seat in the Victorian parliament, while the Greens are also hoping to win the lower house seats of Richmond from Labor and Prahran from the Liberals.
State leader Greg Barber says the new Labor government will need his party in the upper house where they already have three MPs and are hopeful of another two.
"We're still waiting for more information from the upper house but it's clear the government will need the Greens' support," he said.
"The five Greens, if that's what we end up with, will be crucial to every vote."
Mr Barber brushed off suggestions of a chaotic upper house if it comprises a mixed bag of minor parties and said the prospect of working with parties such as the Shooters and Fishers just meant "we'll have to make a few more phone calls".
He said Mr Andrews faced further losses at the next poll in 2018 if he didn't come up with more environmentally friendly policies.
He also accused the incoming premier of trying to roll back his pledges to dump the controversial East West link.
Federal Melbourne MP Adam Bandt said Saturday's result sent a strong message to Prime Minister Tony Abbott that Victoria did not want the East West Link.
In federal parliament on Monday, the Greens will move for the $3 billion in federal funds seat aside for the project be redirected into the Doncaster rail and Melbourne metro rail projects, he said.
Mr Bandt said he was hopeful of what the Victorian result meant for future state elections.
"This is the Greens' time. The issues of climate change are going to get a lot more pressing and we're the only ones talking about it," he said.
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