A green revolution is set to transform the Republic's politics after more than a month of high-stakes government talks.
The two Civil War parties, Fianna Fail and Fine Gael, are on the brink of forming an historic coalition after making a series of concessions to secure Green Party support.
Now all sides face an anxious wait to see if the Programme for Government will be approved by the membership of the three parties. Most in doubt is the position of the Green Party's grassroots, where a two-thirds majority is needed to get the deal over the line.
Negotiating teams from all three parties broke up in the early hours of yesterday morning after finishing a draft Programme for Government to be considered by their party leaders.
Fianna Fail's Micheal Martin, Taoiseach Leo Varadkar of Fine Gael and Green leader Eamon Ryan met last night to thrash out outstanding issues like the state pension age, plans for income tax and future increases in carbon tax. But Fianna Fail and Fine Gael have agreed to the Green Party's red-line demand that carbon emissions be cut by an average of 7%-a-year.
The position of the party's deputy leader Catherine Martin - who is challenging Mr Ryan for his job - will be closely watched as a signal of whether or not the Greens' wider membership will approve the deal.
Her supporters in the looming leadership battle have been among the most vocal sceptics of entering government with the two larger parties.
Ms Martin - who had been opposed to entering talks with Fianna Fail and Fine Gael - was silent last night, though sources involved in the talks believe she will back the agreed deal.
A Fianna Fail source said Ms Martin has "given no indication" that she's not on board with the deal while a senior Fine Gael figure said it would be hard for her not to back it as she was at "all the meetings where the agreement was reached".
A Green source said Ms Martin worked "incredibly hard" on the draft Programme and has been "part of every call we've made during this process".
TDs and senators from all three parties are to examine the fine details of the proposed coalition today before their wider memberships are consulted.
The Green Party source insisted the deal represents "a strong Programme for Government".
They added: "It contains very significant Green Party policy wins across a wide range of areas - environmental, social, housing and equality.
"I believe our members will see the real progress that can be achieved over the next five years and I think they'll support it." Five-year 'Carbon Budgets' setting out greenhouse gas emissions cuts for every sector are to feature as part of the battle against climate change.
Other environmental initiatives like funding of €360m-a-year for walking and cycling as well as a ban on single use plastics have been agreed in the deal.
A Fianna Fail source said the expectation in the party is that Mr Martin would take the first stint in a rotating Taoiseach role.
Mr Martin was tight-lipped on the matter when he spoke to reporters as he arrived at Government Buildings for the talks, merely saying that the first Taoiseach in the coalition would be revealed "in due course".
RTE reported that he said the proposed deal "can represent a new departure for Irish society".