The Headline: Progress, But Nowhere Near Enough
Earlier in July 2026, the Environmental Protection Agency published Ireland's provisional greenhouse gas emissions for 2025, and the figures tell a story that is simultaneously encouraging and sobering. Total national greenhouse gas emissions fell by 2.2%, or 1.2 million tonnes of CO2 equivalent, compared to 2024 — the fourth consecutive year of decline, achieved against the backdrop of a growing economy and growing population. Every major sector contributed to the reduction. Energy industries reached an all-time low. Residential emissions fell to their lowest level in over three decades.
And yet the EPA's own assessment is unambiguous about what the numbers mean in the context of Ireland's legally binding climate commitments: greenhouse gas emissions now need to decrease by over 10% each year from now to 2030 for Ireland to meet its national climate target of a 51% reduction on 2018 levels. In 2025, Ireland achieved 2.2%. The gap between the rate of reduction being delivered and the rate required is, in the EPA's own terms, "extremely challenging."
The National Target: Where Ireland Actually Is
Ireland's national climate objective, set under the Climate Action and Low Carbon Development Acts 2015 to 2021, requires a 51% reduction in greenhouse gas emissions by 2030 compared with 2018 levels. As of the end of 2025, with four years remaining, emissions have fallen by 14.5% from the 2018 baseline. The provisional national total including Land Use, Land Use Change and Forestry was 55.16 Mt CO2eq in 2025.
To reach the 51% target from where Ireland stands today would require reducing emissions from 55.16 Mt CO2eq to the level implied by a 51% cut on the 2018 base — a reduction that, spread across four years, averages out to over 10% per year for each of the remaining years to 2030. The largest annual reduction Ireland has achieved in recent years was approximately 6.8% in 2024. The 2025 reduction of 2.2% is a significant step back from that pace, though the EPA has noted that 2024's reduction was unusually large and partly driven by one-off factors.
EPA Director General Dr Eimear Cotter, who took up the role in March 2026, put the position plainly: "This is the fourth year in a row that Ireland's greenhouse gas emissions have reduced which is welcome in the context of a growing economy and population. However, with just four years to 2030, Ireland needs to accelerate delivery and achieve much deeper annual reductions to meet our climate targets."
The EU Target: An Even Bigger Gap
Ireland's obligations under EU law — specifically the Effort Sharing Regulation, which sets binding annual national limits for emissions outside the Emissions Trading System — present a picture that is more difficult still. Under EU legislation, Ireland must reduce greenhouse gas emissions in key sectors, such as Agriculture, Transport and Buildings, by 42% by 2030 compared with 2005 levels. As of 2025, a reduction of only 12% has been achieved in those sectors.
The compliance data in the EPA report makes the scale of the EU challenge concrete. Ireland's Effort Sharing Regulation emissions in 2025 were 41,951 kilotonnes CO2eq against an EU target of 36,845 kilotonnes — a gross distance to target of 5,106 kilotonnes. Even applying the full available flexibility from the Emissions Trading System (1,908 kilotonnes), Ireland's net distance to its EU ESR target in 2025 stands at negative 3,198 kilotonnes — meaning Ireland is 3,198 kilotonnes over its EU limit for the year even after flexibilities are applied. This is the fifth consecutive year in which Ireland has missed its EU Effort Sharing target, and the distance to target has widened every year from 547 kilotonnes in 2021 to 3,198 kilotonnes in 2025.
Dr Conor Quinlan, EPA Programme Manager, commented: "Sectoral ceilings are intended to make climate progress measurable and accountable. The fact that some sectors, such as Energy Industries and Buildings, are provisionally on track is encouraging, but the overshoots in Transport and Industry show that the overall carbon budget remains at risk unless delivery strengthens across all sectors."
The Sector Breakdown: Who Is Delivering and Who Is Not
The sector-by-sector data in the EPA report provides the granular picture of where Ireland's emissions story is being written in 2025 — and where it is being resisted.
Energy Industries delivered the strongest performance, with emissions falling 7.1% to 6.59 Mt CO2eq — an all-time low, achieved for the fourth consecutive year. The reduction was driven by a significant increase in renewable electricity generation, which accounted for 40.6% of total electricity generation in 2025, combined with an increase in electricity imports, which made up 16.4% of electricity supply in 2025 compared with 14.1% in 2024. This is the sector most directly shaped by Ireland's renewable energy build-out, and the trend confirms that investment in wind and solar is translating into real, measurable emissions reductions at national scale.
Buildings performed well, with emissions falling 4.7% overall. Residential emissions, down 5%, fell to their lowest level in over three decades — currently 2.7 tonnes CO2eq per household, down from a 1990 baseline of 7.5 tonnes. The reduction was driven by a warmer winter and decreased use of fossil fuels for heating. However, the EPA has cautioned that weather-related reductions of this kind are not the same as structural transitions away from fossil fuel heating — and that without the accelerating rollout of heat pumps and home energy upgrades, the underlying baseline remains fragile.
Transport achieved a 1.5% reduction, its second consecutive year of decline. A 14.9% increase in biofuel use and a 35.4% increase in electricity consumption for road transport contributed to the improvement. However, Transport is one of the two sectors that exceeded its Sectoral Emission Ceiling for the 2021-2025 period, overshooting by 8.1%. The pace of EV adoption and public transport investment has not yet been sufficient to drive the structural emissions reduction that Ireland's transport sector targets require.
Agriculture, Ireland's largest emissions sector at 20.4 Mt CO2eq, achieved a reduction of just 0.2% in 2025. A 3.3% reduction in cattle numbers was partly offset by a 12.7% increase in nitrogen fertiliser use and a 4.8% increase in milk production. Agriculture remains the most politically and economically sensitive part of the emissions picture, representing approximately 37% of Ireland's total national emissions excluding LULUCF — and the sector where the distance between current trajectory and required reduction is most structurally entrenched.
Industry fell by 3.3% to 6.0 Mt CO2eq, driven by marked reductions in coal (down 25.5%), oil (down 6.2%) and gas (down 2.7%) usage, alongside a 3.6% reduction in cement sector emissions. However, like Transport, Industry exceeded its Sectoral Emission Ceiling for the 2021-2025 period, overshooting by 9.1%.
F-gases — used in refrigeration, air conditioning and semiconductor manufacture — were the only sector to record an increase in 2025, rising 5.4% to 0.636 Mt CO2eq.
The Carbon Budget Position
Provisionally, Ireland is under its first Carbon Budget by 1.1 Mt CO2eq — a narrow margin of compliance that reflects the cumulative effect of four years of emissions reductions. The Carbon Budget framework, established under the Climate Act, sets five-year limits on total national emissions, and the provisional undershoot of the first budget period provides a small degree of compliance confidence. However, the EPA is explicit that the trajectory from here needs to change materially for the second and subsequent Carbon Budgets to be met.
What Dr Cotter's Assessment Points Toward
In her commentary on the 2025 figures, EPA Director General Dr Eimear Cotter drew a specific and instructive comparison. Since 2005, emissions from the Emissions Trading System — covering large point sources like power generation — have fallen by over 52%. By contrast, greenhouse gas emissions from Agriculture, Transport and Buildings have collectively fallen by only 12% over the same period. This comparison is not accidental. It illustrates the fundamental structural challenge for the second half of Ireland's climate decade: the easy reductions, concentrated in large, regulated point-source emitters, have largely been delivered. What remains is the dispersed, politically complex, infrastructure-dependent task of reducing emissions from the millions of cars, boilers, farms and businesses that make up the non-ETS economy.
"The priority now is to accelerate delivery in these sectors by removing barriers and making low-carbon choices practical, affordable and attractive," Cotter said. That framing — low-carbon choices that are practical, affordable and attractive — is the policy challenge that sits at the centre of Ireland's remaining climate decade. Heat pumps that are too expensive for lower-income households, EV charging infrastructure that doesn't reach rural communities, public transport that doesn't serve the journeys people actually need to make — these are not abstract policy failures. They are, in aggregate, the reason the 2025 emissions figure is 2.2% rather than 10%.
The Bottom Line
Ireland's fourth consecutive year of emissions reductions is a genuine achievement, delivered against a backdrop of economic growth and population expansion that typically push emissions upward. The 2025 figures are also an honest account of an unresolved structural problem: four years remain to the 2030 deadline, emissions have fallen 14.5% from the 2018 baseline, and the target requires 51%. The gap is large, the annual reduction required is over 10% per year, and the sectors where that reduction must come — Transport, Agriculture, Buildings — are the ones where progress has been slowest. The EPA's assessment is clear. The work of the next four years is of a different order of difficulty than the work of the last four.