Mr Barr sensed a mood for change among voters, especially in Canberra, where he said Prime Minister Scott Morrison was "on the nose".

The Labor Chief Minister made the comments as he accused the Morrison government of short-changing the ACT on infrastructure funding.

Mr Barr said if the federal budget didn't include more than the $51 million in funding announced ahead of Tuesday's fiscal update, then the nation's capital wasn't getting its fair share.

But ACT Liberal senator Zed Seselja has shot back at Mr Barr, saying he had delivered more infrastructure funding for Canberra than any federal government in the past three decades.

The Coalition's pre-election budget will include $46.7 million toward the Athllon Drive duplication, $2.8 million to upgrade the Kent Street/Novar Street intersection in Deakin and $1.5 million for work titled "inner Canberra corridor planning package".

The ACT's share represents about 0.28 per cent of the $17.9 billion which will be included for infrastructure projects nationwide in Tuesday's budget. The territory is home to about 1.7 per cent of Australia's population.

"It [$51 million] is not enough when you look at it even on a per capita basis, the ACT would be entitled to more," Mr Barr told reporters on Monday.

"I'll be looking tomorrow night through the budget papers with a somewhat optimistic hope that there might be some more commitments for the ACT, but we'll also then move to the election campaign as well, to ensure that we get our fair share of national infrastructure spending."

Asked if he would feel dudded if the $51 million was the extent of the ACT's share, Mr Barr said: "if that's all it was, clearly that would the case."

Senator Seselja said while Mr Barr was underinvesting in roads and failing to start work on his long-promised Athllon Drive upgrade, the federal government was spending record amounts in the ACT.

He said the Coalition had since 2018 committed more than $2.1 billion in funding for infrastructure projects in Canberra, which was equivalent to spending almost $40 billion in NSW.

The $500 million Australian War Memorial upgrade and $316 million Ngurra Cultural Precinct are among the local projects funded by the Morrison government.

On Monday, Mr Barr joined federal opposition climate change and energy spokesman Chris Bowen and the ACT's three Labor MPs as they announced community batteries would be built in the suburbs of Dickson, Fadden and Casey if Anthony Albanese wins the May election.

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Mr Barr said he was "cautiously optimistic" that Mr Albanese would end the Coalition's near nine years in office, but cautioned federal Labor always faced a tough task.

He revealed he was even more optimistic about a Labor victory than he was ahead of the 2019 election, when Bill Shorten was widely expected to sweep to power.

Mr Shorten was consistently ahead in the polls in the lead up to the election, with his defeat to Scott Morrison surprising most political observers and casting doubts about the accuracy of opinion polling.

But Mr Barr suggested the polls mightn't be so wrong in 2022.

"Having poured over the data and the public opinion polls, and we have been assured by those who conduct them that they've corrected for some of the errors that have occurred previously, there's cause for optimism," he said.

"But it ain't done until it's done," he said.