That was the message from new Chief Minister Andrew Barr and balance of power Greens minister Shane Rattenbury as the pair reaffirmed the existing parliamentary agreement signed with Katy Gallagher in the wake of the 2012 election.

Mr Rattenbury voted for Mr Barr to succeed Ms Gallagher during a special sitting on Thursday, after an exchange of letters to continue the deal which brought Mr Rattenbury into the cabinet room.

A joint communique released before the vote said the majority of items in the existing agreement were completed or under way including after some received funding in the 2014-15 budget.

The 15-page deal prioritises the $800 million light rail project, renewable energy targets, taxation reform, social housing projects and cost of living issues.

Some aspects of the agreement are yet to be delivered, including a long-contested needle exchange program at the Alexander Maconochie Centre. A dispute between the union, prison guards and the government has blocked progress to date.

The government has yet to ban coal seam gas from its energy contracts and at least one overdue promise is the launch of a car-share program allowing drivers to pick up vehicles from central areas for short term loan.

A new solar scheme giving homeowners 20-year guaranteed payments for rooftop power fed into the grid is still yet to be announced, as an existing Council of Australian Governments agreement bans premium prices for householders.

In August, Ms Gallagher said new freedom of information laws, based on Queensland's system and providing greater scrutiny, were being drafted.

Mr Barr said he had held discussions with Mr Rattenbury in recent days, outlining plans for the period leading up to the October 2016 territory election.

Neither party will seek to ditch its governing partner ahead of the election, Mr Barr said, as happened in previous partnerships in state and federal governments.

"I am very optimistic and I think we've been able to forge close working relationships, respecting the areas we disagree and there will be some ... it's not in the interests of this city or in the interests of progressive politics for there to be some sort of faux divorce perhaps like we've seen in Tasmania," he said.

Mr Rattenbury said no new items were added to the agreement as Mr Barr took power.

"I think the most important part of the agreement for me is that we've been able to deliver a stable and effective government here in the territory where the two parties have together to get on with simply delivering for the people of Canberra," he said.

"I am pleased to support Andrew at a personal level ... I think we will work very well together in the future, focusing on the things we need to get done."