Willy Clingan, the journalist present, recalled that "The Ecology Party introduced its seven election candidates at the nicest and most endearingly honest press conference of the whole campaign".

Following a name change to the Green Alliance, it contested the 1984 European elections, with party founder Roger Garland winning 1.9% in the Dublin constituency.

In the 1994 European election, Patricia McKenna topped the poll in the Dublin constituency and Nuala Ahern won a seat in Leinster.

[9][10] Neither the outgoing government nor an alternative of Fine Gael, Labour and the Green Party had sufficient seats to form a majority.

Fine Gael ruled out a coalition arrangement with Sinn Féin,[11] opening the way for Green Party negotiations with Fianna Fáil.

The Green Party had, at its last annual conference, made an inquiry into the irregularities surrounding the project (see Corrib gas controversy) a precondition of entering government[20] but changed its stance during post-election negotiations with Fianna Fáil.

The 2008 budget did not include a carbon levy on fuels such as petrol, diesel and home heating oil, which the Green Party had sought before the election.

As a result, the Green Party did not have an official campaign in the first Lisbon Treaty referendum, although individual members were involved on different sides.

[29] On 23 February 2010, Trevor Sargent resigned as Minister of State for Food and Horticulture owing to allegations over contacting Gardaí about a criminal case involving a constituent,[30] with Ciarán Cuffe being appointed as his replacement the following March.

The Greens were angered at not having been consulted about this effort, and went as far as to threaten to pull out of the coalition unless Cowen set a firm date for an election due that spring.

On 23 January 2011, the Green Party met with Cowen following his resignation as leader of senior coalition partner Fianna Fáil the previous afternoon.

[45] The Greens continued to pick up momentum in 2019, performing quite well during the concurrent 2019 local elections[46] and 2019 European Parliament election[47][48] while in November that same year the party saw Pippa Hackett win a seat in the Seanad and Joe O'Brien bring home the party's first ever by-election win in the 2019 Dublin Fingal by-election.

She said it proposed the "most fiscally conservative arrangements in a generation" and that "the economic and finances behind this deal will really lead to some of the most vulnerable being hit the hardest", as well as it not doing enough on climate and social justice.

[50] She also said the deal "fails to deliver on our promise to tackle homelessness and provide better healthcare", "represents an unjust recovery" and "sets out an inadequate and vague pathway towards climate action".

[59][60][61] Amongst the resignations were councillors Lorna Bogue and Liam Sinclair, who subsequently formed a new left-wing green party called Rabharta in June 2021.

[64][65][66] Senators Pippa Hackett, Pauline O'Reilly and Róisín Garvey tabled a motion of no confidence in Chu as Cathaoirleach of the party.

[69] Chu ran in the 2022 Dublin University by-election and was commended by the party for "championing climate action and inclusion".

[71][72] Hourigan was suspended again in March 2023, this time for 15 months, after she voted against the government on the issue of ending a ban on evictions.

[76] The party also secured significantly increased budgets for active and sustainable travel including greenways and cycle lanes, the LocalLink rural bus network, decreases in public transport fares, a new forestry programme, increased incentives for solar and for retrofit, and the recognition of the circular economy.

Outside of the core climate and environmental policies the party also implemented a pilot scheme for a basic income for the arts sector and large cuts in childcare costs.

[77] In June 2024, the European Union Environment Council approved the Nature Restoration Law which was described as "among the EU's biggest environmental policies".

[80] On 19 June, Roderic O'Gorman and Senator Pippa Hackett both announced that they would be seeking nominations for the leadership position.

[83] On 14 July, Senator Róisín Garvey narrowly defeated Neasa Hourigan with 51% of the vote to become deputy leader.

It also states that "such a right would only apply where the person has a clear and settled intention to end their own life which is proved by making, and signing, a written declaration to that effect.

The 'Fundamentalists' advocated more radical policies and rejected appeals for pragmatism, citing that the looming effects of Climate Change would leave no time for compromise.

It comprises the party leader Roderic O'Gorman, the deputy leader Róisín Garvey, the Cathaoirleach Pauline O'Reilly, the National Coordinator, the General Secretary (in a non-voting role), a Young Greens representative, the Treasurer and ten members elected annually at the party convention.

Sargent and the party negotiated a coalition government; at the 12 June 2007 membership meeting to approve the agreement, he announced his resignation as leader.

Following the election defeats of 2011, Gormley announced his intention not to seek another term as Green Party leader.

Monaghan-based former councillor Catherine Martin defeated Down-based Dr John Barry and former Senator Mark Dearey to the post of deputy leader on 11 June 2011 during the party's annual convention.

Ryan's leadership was challenged by deputy leader Catherine Martin in 2020 after the 2020 government formation; he narrowly won a poll of party members, 994 votes (51.2%) to 946.