Greenhouse gas emissions of companies in Ireland
24 Mt CO2e in 2025 from 144 EU ETS installations, aircraft and shipping companies registered in Ireland, run by 92 companies; 5.9 Mt of it covered by free allowances. Source: Arcadium Data, data as of .
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Largest operating companies
| Operating company | Installations | Emissions 2025 | Free allocation | Allowances to buy |
|---|---|---|---|---|
| Electricity Supply Board | 5 | 2.1 Mt | ||
| CRH plc | 3 | 1.3 Mt | 1.3 Mt | 1 kt |
| Limerick Alumina Refining Limited | 1 | 1.1 Mt | 0.5 Mt | 0.6 Mt |
| Synergen Power Limited Power Plant | 1 | 0.9 Mt | ||
| Bord Gais Energy Limited | 1 | 0.8 Mt | ||
| Aer Lingus Limited AOHA | 1 | 0.8 Mt | 0.1 Mt | 0.6 Mt |
| Huntstown Power Company Limited | 1 | 0.7 Mt | ||
| Mannok Cement Limited | 1 | 0.6 Mt | 0.6 Mt | 18 kt |
| Energia Power Generation Limited | 1 | 0.6 Mt | ||
| SSE Generation Ireland Limited | 4 | 0.5 Mt | ||
| Breedon Cement Ireland Limited | 1 | 0.4 Mt | 0.4 Mt | none |
| Irving Oil Whitegate Refinery Limited | 1 | 0.3 Mt | 0.2 Mt | 0.1 Mt |
| Tynagh Energy Limited | 1 | 0.2 Mt | ||
| Arrabawn Cooperative Society Limited | 7 | 0.2 Mt | 90 kt | 0.1 Mt |
| Tirlán Limited | 3 | 0.2 Mt | 74 kt | 83 kt |
| Stena Line Limited | 1 | 0.1 Mt | ||
| Ryanair UK Limited | 1 | 0.1 Mt | 21 kt | 90 kt |
| Kerry Ingredients (Ireland) Limited | 2 | 92 kt | 36 kt | 55 kt |
| Contarga Limited | 1 | 84 kt | ||
| ASL Airlines (Ireland) Limited | 1 | 78 kt | 21 kt | 56 kt |
| Clogrennane Lime Limited | 1 | 63 kt | 50 kt | 13 kt |
| Intel Ireland Limited | 1 | 58 kt | 6 kt | 52 kt |
| CLDN RORO LIMITED | 1 | 45 kt | ||
| Vermilion Exploration and Production Ireland Limited | 1 | 42 kt | 8 kt | 34 kt |
| Carbery Food Ingredients Limited | 1 | 40 kt | 14 kt | 26 kt |
Largest installations
| Installation | Activity | Country | Operating company | Emissions 2025 |
|---|---|---|---|---|
| Aircraft operator activities | Aircraft operator activities | Ireland | 12 Mt | |
| Aughinish Alumina | Combustion of fuels | Ireland | Limerick Alumina Refining Limited | 1.1 Mt |
| Irish Cement Limited (Platin Works) | Production of cement clinker | Ireland | CRH plc | 0.9 Mt |
| Dublin Bay Power Plant | Combustion of fuels | Ireland | Synergen Power Limited Power Plant | 0.9 Mt |
| Whitegate Power Station | Combustion of fuels | Ireland | Bord Gais Energy Limited | 0.8 Mt |
| Aer Lingus Limited AOHA | Aircraft operator activities | Ireland | Aer Lingus Limited AOHA | 0.8 Mt |
| Aghada CCGT | Combustion of fuels | Ireland | Electricity Supply Board | 0.7 Mt |
| ESB Poolbeg Generating Station | Combustion of fuels | Ireland | Electricity Supply Board | 0.7 Mt |
| Huntstown Power Station | Combustion of fuels | Ireland | Huntstown Power Company Limited | 0.7 Mt |
| Scotchtown Cement Works | Production of cement clinker | Ireland | Mannok Cement Limited | 0.6 Mt |
| CCGT HPC2 (Huntstown Power Station Phase II) | Combustion of fuels | Ireland | Energia Power Generation Limited | 0.6 Mt |
| ESB Moneypoint Generating Station | Combustion of fuels | Ireland | Electricity Supply Board | 0.5 Mt |
| Great Island Generating Station | Combustion of fuels | Ireland | SSE Generation Ireland Limited | 0.5 Mt |
| Breedon Cement Ireland Limited | Production of cement clinker | Ireland | Breedon Cement Ireland Limited | 0.4 Mt |
| Irish Cement Limited (Limerick Works) | Production of cement clinker | Ireland | CRH plc | 0.3 Mt |
| Irving Oil Whitegate Refinery Limited | Refining of mineral oil | Ireland | Irving Oil Whitegate Refinery Limited | 0.3 Mt |
| Tynagh 400MW CCPP | Combustion of fuels | Ireland | Tynagh Energy Limited | 0.2 Mt |
| Stena Line Limited | Maritime operator | Ireland | Stena Line Limited | 0.1 Mt |
| Ryanair UK Limited | Aircraft operator activities | Ireland | Ryanair UK Limited | 0.1 Mt |
| Glanbia Ireland DAC Ballyragget | Combustion of fuels | Ireland | Tirlán Limited | 94 kt |
| Contarga Limited | Maritime operator | Ireland | Contarga Limited | 84 kt |
| ASL Airlines (Ireland) Limited | Aircraft operator activities | Ireland | ASL Airlines (Ireland) Limited | 78 kt |
| Bailieboro Foods Limited | Combustion of fuels | Ireland | Arrabawn Cooperative Society Limited | 75 kt |
| Maritime operator | Maritime operator | Ireland | 67 kt | |
| Clogrennane Lime Limited (Toonagh Lime Works) | Production of lime, or calcination of dolomite/magnesite | Ireland | Clogrennane Lime Limited | 63 kt |
By sector
- Power and heat (106 installations)
- Cement, lime, glass and ceramics (9 installations)
- Aviation (16 installations)
- Shipping (11 installations)
Emissions are verified EU Emissions Trading System emissions in tonnes of CO2 equivalent for 2025: the installations, aircraft operators and shipping companies covered by the ETS, not a company's total footprint (no scope 2 or 3, no sites outside the ETS). Free allocation is the free allowances allocated for the same year; "allowances to buy" is emissions minus free allocation, the exposure that grows as free allocation is phased out under CBAM from 2026. Companies only: an account holder that is not a company is never shown. Data as of 2026-10-25, updated yearly.
Emissions and allocation: European Commission, Union Registry of the EU ETS (verified emissions, free allocation, compliance and the list of operators; Commission reuse policy, CC BY 4.0). Parent company and pollutant releases of facilities: European Environment Agency, Industrial Emissions Portal (CC BY 4.0). Legal-entity identifiers: GLEIF (CC0).
Questions
Where does this data come from?
The European Commission publishes verified emissions, free allocation and compliance of every installation in the EU Emissions Trading System, and the list of operators with company registration number and LEI. We join them to the operating company, its website and its ultimate parent, and record changes each year.
Is this a full carbon footprint?
No. It covers emissions that fall under the EU ETS (power and heat, heavy industry, aviation within Europe, shipping). It has no scope 2 or scope 3 emissions and no sites outside the ETS.
Does the list show private persons?
No. Operators are shown only when they are companies. Account holders that could be natural persons are left out, and the data has no addresses or contact details.
Cite as: Arcadium Data, "Greenhouse gas emissions of companies in Ireland: 24 Mt in 2025", https://arcadiumdata.io/emissions/ie/, data as of 2026-10-25.