Chief Minister Andrew Barr has promised there would be no cuts to the ACT public services or sale of territory assets under a re-elected Labor government.
Mr Barr will use a speech at Saturday's ACT Labor conference to launch "Labor's Guarantee", the party's first major policy announcement ahead of next year's territory election.
Labor made a similar commitment ahead of the 2016 election.
The speech will be delivered moments before Mr Barr faces a push to give rank-and-file Labor members the power to help choose the party's leader.
Mr Barr will tell the party faithful that a re-elected Labor government would seek to grow the territory's 22,000-strong public sector workforce in the coming years, insisting that "now more than ever ... we cannot take these services backwards".
He will make an iron-clad guarantee not to privatise government assets, including ACTION buses and CIT.
"Public services will stay in public hands," Mr Barr will say in the speech.
"That means education and public transport services will not be sold off, 'outsourced', put into 'alternative arrangements' or any other weasel words that are used to dress up a harmful privatisation agenda.
"We can make this guarantee because we've put the territory's finances on strong and responsible footing."
Labor intends to use the pledge to put pressure on the Canberra Liberals, which it claims will be forced to cut essential services as a result of plans to freeze rates and abolish payroll tax.
Opposition leader Alistair Coe has already ruled out cuts to the public service if the Liberals win the October 2020 ballot, even floating the idea of bringing water services back under government control.
After Mr Barr delivers his address to the conference, the Lanyon branch will seek support to change the process for choosing a leader, in a move aimed at bringing ACT Labor closer into line with the party's rules federally and in other states, such as NSW.
At present, Labor MLAs vote to elect the party's leader.
Under the Lanyon proposal, a ballot of rank-and-file members would be conducted to help select the leader.
The Canberra Times understands the results of the member ballot and caucus vote would be evenly weighted.
The NSW Labor Party used a similar process for the first time last month to elect Jodi McKay as the leader of its parliamentary party.
The proposal came as a surprise to ACT Labor powerbrokers, who were not consulted on the idea.
Labor party members are also scheduled to consider a proposal to make public transport free for school children, along with motions relating to public housing and homelessness, sexist advertising, animal welfare and licensing of property developers.
Member will also debate changing the party's rules to ensure that 12 of the 25 candidates pre-selected for next year's territory election are women.
The party wants that number to grow to 13 at future ACT elections, as part of its affirmative action agenda.
The structure of ACT Young Labor could also be set for a shakeup, with a proposal put forward to install co-presidents and hold less frequent meetings.
The proposed changes are aimed, in part, at reforming the culture within the organisation, following controversies involving it and other youth branches of major political parties across the country.