The Greens, with their three ministers in cabinet and 12 portfolios between them, now have oversight of (I suggest you take a deep breath); Canberra's parks and wildlife, Canberra's water, Canberra's energy, Canberra's gaming machines, Canberra's homelessness, mental health and communities services, Canberra's heritage and the quality of Canberra's buildings.

With Mr Rattenbury appointed Attorney-General, the ACT has a Green as its first law officer and constitutional adviser to the territory government.

For a progressive party, these appointments are akin to being handed the keys to the castle.

If these positions were mirrored federally, Greens leader Adam Bandt, not Christian Porter, would in charge of designing the federal ICAC and Sarah Hanson-Young, not Sussan Ley, would be overseeing changes to the nation's environment and biodiversity laws.

The Greens' ACT election haul has handed them power, the likes of which haven't been held by a minor (can the Greens even been called that?) party in the history of the ACT Legislative Assembly.

The Greens won four of the 17 seats at the 2008 election, but none of their members sat in cabinet.

They are very much inside the tent now.

As to how the Greens intend to exercise their power, look no further than the terms of the power-sharing agreement inked with Labor on Monday.

The list of "shared priorities" shows just how far the Greens have been able to use their collective force to pull Labor to adopt policy positions which more closely reflect its own, in areas including housing, climate action, planning, and gambling harm reduction.

When the Greens pull Labor further to the left, all of Canberra gets pulled along with them - for better or worse.

And make no mistake, the Greens' ascension will strike fear into sections of the community.

Following Andrew Barr's cabinet shakeup, the ACT now has a Minister for Gaming who believes community clubs need to be weaned off their "addiction" to pokie revenue.

Some would argue this is all too much power for a party which won just 13.5 per cent of the vote on October 17. The Canberra Liberals, by comparison, received 33 per cent of the vote.

But that is how the cards have fallen.

Greens would be prudent not to overestimate their support in the electorate as they set about exercising their new-found power, for the sake Canberra and their own electoral fortunes.

If Should Rattenbury's Greens abuse their power - should they seek to "Build a Better Normal" for themselves and their followers, rather than the broader community - Canberrans will retaliate at the ballot box in 2024.