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. Josar Holdings (Kentech)

Kentech provides engineering, procurement, construction, commissioning and maintenance services to the energy industry. Its customers are in the oil, gas, power, and petrochemical industries in the Middle East, Russia and Mexico. The company was founded in Ireland...

4. 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 ...

5. Dragon Oil

Dragon Oil is a 100 per cent operator of the Cheleken Contract Area, offshore Turkmenistan, where it re-develops two oil and gas fields. The Group also has exploration assets in Tunisia, Iraq, Afghanistan, Egypt, Algeria and the Philippines. It is based in Dubai and ...

6. 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...

7. Topaz

Topaz energy was formed in 2008 by Ion Equity following the merger of the former Shell and Statoil forecourt networks. It operates about 330 petrol stations across the country and accounts for about a quarter of the market. In December 2015 the group announced it was...

8. Ervia

Ervia (formerly known as Bord Gáis Éireann (Bord Gáis)) has evolved in recent years from an energy company to a multi-utility company responsible for strategic national gas and water infrastructure and services. A commercial enterprise owned by the Irish State, it buil...

9. Kenmare Resources

Kenmare Resources plc has been a mining and exploration company since 1972. The company is a member of the FTSE 250 Index and has a primary listing on the London Stock Exchange and secondary listing on the Irish Stock Exchange. The principal activities of the group are ...

10. C&F Group

C&F provides contract manufacturing services to the IT, motor and refrigeration industries from bases in Ireland, eastern Europe, the US and China. It also makes wind-turbines and renewable energy solutions. The group is entering the small-scale wind turbine market, d...

11. Bord na Mona

Bord Na Móna is an integrated utility service provider encompassing electricity, heating, resource recovery, water, growing media and related services. It is headquartered in Newbridge, Co Kildare and employs over 2,000 people.

12. 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 ...

13. KN Network Services

KN Network Services is an infrastructure and utilities services provider operating in Ireland, UK and internationally. Its areas of expertise span civil engineering, telecoms, construction, wireless technologies, rail infrastructure and home energy services. Its Irish o...

14. Suretank

Suretank manufactures cargo carrying units for the offshore oil industry. Established in 1995 in Ireland to supply the North Sea, the company is now a global supplier with design and manufacturing facilities in Ireland, UK, Brazil, USA, Poland, Thailand and China as w...

15. Esbi Engineering & Facility Management

The primary activity of Esbi Engineering & Facilitiy Management Limited is the provision of electrical, mechanical, civil and environmental engineering services. The company is part of ESB International (ESBI), a growing international energy company and one of Europ...

16. Stafford Group

The privately-owned Stafford Group is involved in sports retail, oil/solid fuel importation and distribution, shipping, storage and property development. The Stafford Group's energy division consists of Campus Oil and Stafford Fuels. The company also owns the Lifestlye ...

17. 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...

18. Corrib Oil

Ballinasmalla Holdings is the company behind Corrib Oil, which is involved in the sale and distribution of petrol products and the operation of service stations and shops. It operates 15 service stations around the country, mainly in the west, north west and midlands ...

19. CG Power Systems

CG Ireland comprises two entities CG Automation & CG Power Systems. The company provides distribution transformers, power transformers, automation, service division, T & D systems and solutions, switchgear products and instrument transformers. The wider CG group is ...

20. 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 Group; ...