Greens leader Shane Rattenbury is the ACT's new Attorney-General, as part of a new-look cabinet unveiled by Chief Minister Andrew Barr on Tuesday.
Mr Rattenbury will be joined in cabinet by his Greens colleagues Rebecca Vassarotti, who has been handed the environment and heritage portfolios, and Emma Davidson, who is the ACT's new minister for mental health and disabilities.
The Greens leader will also be the minister for gaming, and hold responsibility for water, energy and emissions reduction.
Mr Rattenbury said he was honoured to take on the role of Attorney-General and said he believed the high-profile ministry was a reflection of the working relationship he had built with the Labor party over eight years in cabinet.
Mr Barr agreed to hand the Greens three ministerial positions in his cabinet, as part of the power-sharing agreement which guarantees Labor's hold on power for the next four years.
The Greens would work cooperatively with Labor, Mr Rattenbury said.
"You will never see me be the John Barilaro of this government, we will agitate for the issues that matter but I think that John has a very unique style, it's not one I am hoping to replicate," he said.
The Chief Minister has allocated himself the new climate action portfolio, meaning he'll be in charge of delivering the big battery project promised during the election campaign.
Mr Barr said that Labor promise, as well a scheme to deliver interest-free loans for electric appliances, was part of the reason he was taking on the portfolio, which was previously held by Mr Rattenbury.
"I had this discussion with Shane and believed that it was appropriate as first minister given the importance of the portfolio and the fact [it included] two signature Labor party commitments... it would be appropriate for me as first minister to deliver," he said.
As reported in the The Canberra Times, Suzanne Orr has been dumped from Mr Barr's cabinet in place of Tara Cheyne, who will take on the new human rights portfolio. Ms Cheyne has also been handed arts, business, multicultural affairs and assistant for economic development.
Ms Orr's demotion means there are no ministers in the northern suburbs electorate of Yerrabi, where Labor suffered an almost 10 per cent swing against it at the October 17 election.
Mr Barr defended the lack of cabinet representation in Yerrabi by saying it would give members more time to be "on the ground" in the electorate. He said he would also spend more time in Yerrabi.
"One of the lessons we learnt there was we need to do more on the ground in that electorate," he said.
The Chief Minister said Ms Cheyne was chosen by the Labor caucus to hold a ministerial position. He said Ms Orr would have been included if more cabinet positions were available.
"We had an unfortunate situation in where we had more qualified candidates than available ministerial votes," Mr Barr said.
"The legislation as it is at the moment limits the executive to nine. Labor had seven ministers in the previous parliament we've got six in this parliament.
"Suzanne will have opportunities to serve again in the executive. She has a long parliamentary career ahead of her and in a situation where there was seven Labor ministers Suzanne would have been one of those seven."
Health minister Rachel Stephen-Smith, education minister Yvette Berry, transport minister Chris Steel and planning minister Mick Gentleman have retained their primary portfolios in Mr Barr's cabinet shakeup.
Ms Vassarotti's immediate elevation to cabinet means there are four ministers in the inner-city seat of Kurrajong, which is also home to the three home party leaders - Mr Barr, Mr Rattenbury and Liberals leader Elizabeth Lee.
The Chief Minister said it would be a challenge to balance local member responsibilities but said it was justified as the Legislative Assembly is located in the Kurrajong electorate.
"It is a little bit different, to be frank, for the outer suburban electorates where it has been observed that being in Civic is a long way from your constituents, in this electorate you are always in Kurrajong," he said.
The new-look cabinet has seen the split of a number of ministerial portfolios, which Mr Barr said would enable greater collaboration.
Environment and planning have been split, Mr Gentleman retained planning while Ms Vassarotti will take on environment.
Ms Vassarotti has also taken on a newly-created ministerial role as the Minister for Homelessness and Housing Service. This was previously under the Minister for Housing and Suburban Development, which Ms Berry has retained.
The Deputy Chief Minister will oversee land supply and construction but Ms Vassarotti will take on the delivery of the services.
Mr Barr said the role was split as it was a priority area in the parliamentary agreement.
Ms Vassarotti will also take on building quality, which will fall under her role as Minister for Sustainable Building and Construction.
"For along time we know we have had a real challenge around construction and around building quality in particular," she said.
"I'm really looking forward to working with industry because I think everyone wants to develop buildings that are the very best quality, that are climate ready and are actually meeting the needs of residents."
Ms Cheyne said her ministerial appointments were areas she had showed interest in.
"My number one priority is always going to be the Belconnen community but I think if you look at the portfolios that I have been very lucky to receive they are much an extension of my areas of interest and the areas I have already been doing a lot of work in," she said.