The ACT Greens had a surprise power surge claiming five seats across the city and ushering in four new MLAs.

Alongside the Greens, one new Liberal member and two for Labor will soon enter their first term in parliament.

In the seat of Yerrabi, covering Gungahlin, the Greens' Andrew Braddock and the Liberals' Leanne Castley will become MLAs.

The Greens saw a swing across the city towards them, with 3.2 per cent in Yerrabi cementing Mr Braddock's position.

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He said he had been nervous ahead of the vote in what was a key battleground between Labor and Liberal, but that an alternative voice had been missing from the diverse electorate.

"I still can't quite believe it," he said.

Further south, the electorate of Murrumbidgee covering the Woden and Molonglo valleys welcomed Labor's Marisa Patterson and the Greens' Emma Davidson into the fold.

"I am extremely excited today. This is fantastic. I can't say thank you enough to the people of Murrumbidgee for supporting me and supporting Labor," Ms Patterson said.

Ms Davidson retained the seat for her party after MLA Caroline Le Couteur retired.

In Kurrajong, the Greens' Rebecca Vassarotti was in the lead for the final seat, which would make her the second member for her party in that electorate if she holds it as counting continues.

In the Belconnen-based electorate of Ginninderra, the Greens Jo Clay will be the fifth MLA for the party.

Labor's Taimer Werner-Gibbings is just ahead of the Greens' Johnathan Davis in the electorate of Brindabella in Canberra's south.

He said his party had played a commonsense campaign that had won them a sixth term.

"We turned over every single pebble to try and make our case about why a third Labor representative for Brindabella was the best outcome in the next parliament," Mr Werner-Gibbings said.

ACT Greens leader Shane Rattenbury said he had a "quiet optimism" from the outset of the campaign coming off the back of the Greens' performance in the 2019 federal election.

"We knew from the start of the campaign if we could replicate that we could win a seat in every part of Canberra," he said.

The result was proof his party resonated beyond the city's inner suburbs, Mr Rattenbury said.

"We've seen right across the city a growth in the Greens vote, this is not just about the central parts of Canberra," he said.

"From the south of Tuggeranong, to the northern tip of Gungahlin to the western edge of Belconnen, right across the city the Greens vote has grown and we have seen support for our ideas."

He said addressing the climate crisis and housing would be key issues in the next parliament, but it is not yet known what role the party will play in a Labor cabinet after Chief Minister Andrew Barr downplayed the notion of multiple Greens MLAs taking ministerial positions.

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