1. DCC

The DCC group provides sales, marketing, distribution and business support services and operates across five divisions: Energy, SerCom (which encompasses IT and entertainment products) Healthcare, Environmental and Food and Beverage.

2. ESB

ESB is Ireland’s leading sustainable energy company, comprising power generation, networks, supply and international divisions.

3. Applegreen

Motorway service station operator Petrogas is the company behind the Applegreen service stations. Applegreen is part of a consortium that holds a public-private partnership (PPP) contract with the National Roads Authority (NRA) to build and operate six motorway service ...

4. Circle K Ireland Energy Group Limited

Circle K Ireland is the largest fuel and convenience retailer in Ireland. Part of the global fuel and convenience store brand Circle K, it is owned and operated by the Canadian company Alimentation Couche-Tard. With 2,300 employees across the island of Ireland, its reta...

5. Whitegate Refinery

In July 2016 Irving Oil, which operates the largest oil refinery in Canada, acquired the Whitegate Refinery, formerly owned by Phillips 66. It comprises three business segments, the Whitegate Refinery, Ireland's only refinery, a wholesale marketing business and the Ba...

6. Valero Energy Corporation

Valero Energy Corporation, through its subsidiaries, is an international manufacturer and marketer of transportation fuels, petrochemical products and power. Valero subsidiaries employ approximately 10,000 people, and assets include 15 petroleum refineries with a combin...

7. Tullow Oil

Tullow oil is an independent oil and gas exploration and production company. Its focus is on finding and monetising oil in Africa and the Atlantic Margins. Its portfolio of over 135 licences spans 22 countries and is organised into three regions. It is headquartered in ...

8. CMC

CMC distributes and markets coal products which is mined at Cerrejón, Colombia. It has an office in Dublin where it employs 31 people. Europe is the largest single market for CMC and it also sells to central and south america, the US and Asia. It is owned in equal par...

9. Tedcastle

Tedcastle Holdings is one of the largest fuel importers and distributors with a diverse range of other businesses right across the island of Ireland. Founded in 1960, Tedcastle Oil Products (TOP) Oil is the most widely known company within the Tedcastle Holdings Gro...

10. Energia

Energia is the retail arm of the Viridian Group in the deregulated Irish energy market. Energia supplies both electricity and gas to a wide range of customers (industrial and commercial) and has some 60,000 customers. It is based in Dublin and employs 30 people.

11. SSE Airtricity

SSE Airtricity is in independent energy provider, supplying over half a million domestic and commercial gas, electricity and home energy services customers in the Republic of Ireland and Northern Ireland. The company is a wholly-owned division of the Top 40 FTSE listed ...

12. Bord Gáis Energy

Bord Gáis Energy is a gas and electricity supplier and supplier of energy services. It generates, sells and trades energy for use in the Republic of Ireland. It has been in operation since 1976 and today supplies over 750,000 customers with energy in Ireland. In 2014...

13. EirGrid

EirGrid plc is a leading Irish energy business, dedicated to the provision of transmission and market services for the benefit of electricity consumers. It is a state-owned commercial company. EirGrid holds licences as independent electricity Transmission System Ope...

14. Maxol

McMullan Bros is the family-owned company behind the fuel wholesaler and retailer Maxol. Maxol has a network of more than 230 service stations and 22 authorised oil distributors.

15. Schneider Electric

Schneider Electric sell uninterruptible power supply products and services. This offers businesses a power supply to protect against outages. It also offers solutions to deal with the safety and efficiency of power provision. Its headquarters are in Maynooth and it empl...

16. Inver Energy

Inver Energy is a leading independent oil importer and supplier in Ireland. It supplies a full range of oil products, including automotive, heating, industrial, and marine fuels. Inver sells fuel to Distributors on an ex-rack basis in Foynes and also delivers product...

17. Caterpillar Northern Ireland

Founded in 1966, Caterpillar (NI) Limited is Europe's largest diesel generating set manufacturer. The company houses eight Caterpillar divisions across four sites in Northern Ireland and has global manufacturing facilities in Brazil, China, India and the USA. The compa...

18. Scottish Power Renewables

Scottish Power Renewables is part of Iberdrola, the world’s largest wind energy developer, with an operating portfolio of over 14,000 megawatts. Scottish Power Renewables is responsible for progressing a number of onshore wind and marine energy projects in the UK and I...

19. Diesel Card Ireland

Diesel Card Ireland Limited is Ireland's largest fuel card provider with over 1000 sites. It has offices in Galway and Derry. The principal activity of the group is the resale of oil products. DCI Ireland, which has offices in Derry and Galway. provides fuel card ser...

20. Nicholl Fuel Oils

Nicholl Oils was founded by the Nicholl family in 1964 and now is one of the leading distributors of oil in Northern Ireland. The company's products include home heating oil, kerosene and low sulphur gas oil. The company has 15 branches across Northern Ireland. It is ...