The Republic's next government will be formed tomorrow after the Green Party voted resoundingly to enter coalition with two larger rivals.
Members of the environmentalist party decided by a 76% majority to form an administration with Fine Gael and Fianna Fail, a party statement tonight said.
It signed up to a programme which promises radical action on climate change but will also have to shoulder the burden of leading the country's economic recovery from Covid-19.
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Deputy leader Catherine Martin said: "Now we will move forward together, respecting the democratic wishes of the majority of our party at all times, listening to each other ... working in unity to protect our country and our planet."
Fianna Fail leader Micheal Martin will take over the role of Taoiseach in an historic reconciliation of a political feud with Fine Gael dating back to the foundation of the state a century ago.
The two larger parties needed the support of the Greens to have a working majority in the Irish parliament, equating to around 80 seats.
February's election was inconclusive and efforts to strike an agreement were hampered as the country's caretaker Government coped with the pandemic.
Mr Martin said he was "delighted" with the result.
Speaking in Dublin after 8,194 Fianna Fail members backed the deal, he said: "Democracy in our party is alive and well, and I'm delighted that the recommendation that I gave to the party membership, recommending this programme for government, has been so overwhelmingly endorsed by the party membership.
"I'm very grateful to the members for doing that and I think what it says to me is that the vast majority of the party are very anxious, and I'm sure those who voted against it are too, that we get on with the business of helping the country to get through this crisis.
"To engineer economic recovery in the aftermath of Covid-19, to deal with the ongoing health dimension and risks associated with Covid-19, but critically to get people back to work, to get the different sectors back to work, to create a better type of society, a greater quality of life for people.
"I think that's what informed the decision of our membership.
"Essentially, the function and obligation of elected representatives in parliament is to assist in the formation of a government and to facilitate that and be part of it if that is their objective."
