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Electrical Oil Services celebrates 20th anniversary
Author: Sandra ZirmNov 1, 2019 12:00:00 AM2 min read

Electrical Oil Services celebrates 20th anniversary

Frankfurt a.M., 1. November 2019 – Electrical Oil Services (EOS), a brand of HCS Group and a leading supplier of unused and reclaimed insulating oils and associated services, is celebrating its 20th anniversary. Founded on 1st November 1999 in the United Kingdom, EOS is today a key contributor to the circular economy by offering a “Closed-loop” model in Europe, which allows transformer oils to be regenerated to as new quality for re-use on a sustainable basis.

Acquisitions support expansion

To expand its regional service offerings, two acquisitions were made in 2018 allowing customers in the electricity transmission and distribution markets as well as high-energy demanding industries to benefit from a comprehensive and tailor-made transformer service package also in Germany and Continental Europe.

EOS was founded as a 50:50 joint venture between the electrical oils businesses of Carless Refining & Marketing Ltd and Castrol UK Ltd back in 1999. However, the business originated in the UK after World War II, when crude oil was a rare and a valuable resource. The country’s’ industry had to find solutions to re-use the existing raw materials and the beginning of the EOS “Closed-loop” model was born. Today, customers are still utilising this business model based on the increasing awareness that existing resources can be recycled and treated in a sustainable manner.

Back then and now, EOS is responsible for all insulating oil needs – from mobile processing and regeneration to transformer oil collection, sample testing and vacuum oil filling.



Electrical_Oil_Services-EOS_Premium_X_1100x620px_221111The electricity supply industry and large industrial energy users benefit from the EOS products and services as they help to extend transformer lifetime. Today, EOS is celebrating its 20th anniversary. © HCS Group GmbH


About EOS

Electrical Oil Services (EOS) is a key brand of HCS Group GmbH and a leading supplier of unused and reclaimed insulating oils and associated services in Great Britain and continental Europe. EOS specialists have 60 years’ experience in the production and marketing of insulating oils and supply both large and small customers in the electricity distribution industry with tailor-made solutions. For further details please visit

About HCS Group

The HCS Group is a leading international supplier of solutions for high-value hydrocarbon specialties. The Group includes the brands Haltermann Carless, ETS Racing Fuels and EOS. The HCS Group has about 500 employees and is headquartered in Frankfurt am Main, Germany. The company belongs to H.I.G. Europe, a subsidiary of the US private equity company, H.I.G. Capital. For further details please visit


Author: Sandra Zirm

Sandra Zirm is Head of Corporate & Marketing Communications at HCS Group and is responsible for the company's strategic communications, including press relations and sales communications for the Haltermann Carless, ETS Racing Fuels and Electrical Oil Services (EOS) brands. One focus of her work is the development of online communications and Inbound Marketing. T +49 69 695 386 117 E-mail