Canberrans are heading to the polls today to vote in a new government.

Polls suggest ACT Labor, led by Katy Gallagher, is well ahead of the Liberal Opposition and will buck the national trend and stay in power.

If Ms Gallagher's team triumphs today, it will be the first time a Labor government has retained power at a state or territory election since Julia Gillard's 2010 election win.

The polls put Labor in front, but it is widely tipped that the party will again have to rely on the support of the Greens to form government.

The Greens are expected to get a ministry if Labor retains power.

Ms Gallagher says it has been a hard campaign.

"Stress, nervous, exhausted. It's the end of what's been a long year and a pretty tough campaign," she said.

ACT Liberal leader Zed Seselja casts his vote. ( AAP: Alan Porritt )

The Liberal Opposition, led by Zed Seselja, has fought its campaign on local issues, claiming that household rates will triple under Labor, something the Government denies.

Labor has mainly focused its efforts around health and education.

Mr Seselja says the Liberal Party is offering something different by focusing on local services and addressing cost of living pressures.

"We're getting a very good response, I'm not a pundit and I'm not going to predict the result but I would suggest that some of the predictions others have made will be proven wrong," he said.

"I think we can win, I think this election is still there to be won.

"We don't believe they deserve 15 years. Fifteen years of Labor would be disastrous for this city."

Earlier, polling officials took issue with a hot air balloon emblazoned with Liberal Party insignia that was inflated as Mr Seselja arrived to vote at Gordon primary school.

Political advertising is not allowed within 100 metres of a polling place under ACT election rules, and the stunt was quickly deflated.

The Liberals have also been asked to take down oversized election signage from polling booths around Canberra.

The ACT Greens have expressed concern about the signage, saying it is above the size permitted in the ACT.