If insulating oil in transformers has aged and parameters such as the dielectric loss factor, colour number, interfacial tension or neutralisation number are poor, the insulating oil should be replaced. The question is whether it is more economical to simply dispose of the aged transformer oil and to replace it with new oil or to ensure that it is regenerated on site in the transformer. After all, oil reclamation contributes to resource conservation and greater sustainability - and is also reflected positively in the costs. Read more about this.
Dispose of insulating oil or recycle it? What are the arguments for recycling?
In general, recycling insulating oil is more environmentally friendly than its disposal. In addition, recycling is also more cost-efficient. Read these facts:
1. The cost of disposing of transformer oil is usually higher and varies by region:
Generally speaking, new oil has higher financial costs due to the process of exploration, extraction, transportation and refining of the raw material and the final product. Also, new insulating oil depends on the international oil market and currency fluctuations, while reclaimed oil is less under pressure from global trade and can be reprocessed with local resources.
The cost of insulating oil disposal is determined by the amount of oil concerned, the recycling services available and local regulations. It is best to check with regional disposal service providers to find out exact prices for your specific case.
2. The quality of recycled certified insulating oil can be as good as new virgin oil
Both new, unused and recycled insulating oils must follow the same specifications for transformers and switchgear in the IEC 60296:2020 standard. Certified recycled transformer oils is therefore just as good as new, unused insulating oils.
3. Disposing of insulating oils increases waste and contributes to global warming – not so oil recycling:
Insulating oil recycling optimally reuses what would otherwise be irrevocably lost in waste incineration. In this way, resources are available for longer. In principle, all mineral insulating oils made from naphthenic material can be fully recycled. Exceptions here are transformer oils that are unsuitable for recovery due to cross-contamination with other substances or that show exceptionally severe signs of ageing.
4. On-site treatment is particularly cost-effective
An additional economic benefit arises when the regeneration or treatment of the insulating oil is carried out directly on the operator’s premises. In many cases, this means the transformer does not need to be transported or taken out of service for long periods. This significantly reduces downtime, transport costs and organisational effort.
Particularly in the case of large power transformers, on-site treatment can therefore represent a significantly more cost-effective alternative to a complete oil change. At the same time, professional oil regeneration sustainably extends the service life of both the transformer and the insulating oil. Companies thus benefit not only from lower operating costs, but also from improved plant availability and greater security of supply.
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Companies are well advised to recycle transformer oil
The legal requirements with regard to environmental protection are increasing and are now also reflected in the costs.
Therefore, measures for environmental protection or for energy efficiency and recycling are increasingly at the centre of many corporate targets. They are an integral part of corporate policy and are systematised by integrated management systems, such as the ISO 14001 environmental management system standard. The recycling of transformer oil is among such environmental protection measures.
Read the following article to find out when to choose recycled insulating oil and what to look for at the manufacturer or recycling service provider.
This article explores the following points in more depth:
- Why transformer oil recycling is not only cost-efficient and sustainable, but also promotes your image.
- How you can safeguard the quality of recycled transformer oils.
- Which standards and certificates are important when dealing with transformer oil.
Conclusion: Acting sustainably whilst reducing costs
In the event that you really need to dispose of your transformer oil, Electrical Oil Services (EOS) will be happy to assist you. Because EOS works - cost-transparently - with fully documented and approved procedures and testing mechanisms: EOS is a certified specialist transformer oil disposal company. We can dispose your insulating oils including a disposal certificate and send you all the documents.
But we are also experts and certified in this:
EOS recycles your transformer oils - with a complete oil regeneration or with an oil processing that includes drying, filtering and degassing. Both can be done on site - even during operation.
In addition, Electrical Oil Services offers you a high-quality recycled transformer oil product (EOS® Premium Insulating Oil), which is an attractive alternative for companies. This reclaimed transformer oil helps small and large companies from the energy supply sector and industry to protect the environment and to reduce waste and greenhouse emissions from insulating oils to a minimum.
Find out more in this blog article:
There you will find, among other things, the advantages and technical specifications of our recycled EOS® Premium Insulating Oil.
If you have any questions, please feel free to send us a message. We will contact you directly:
FAQs: Dispose of or recycle insulating oil?1. What is cheaper – disposing of insulating oil or having it recycled?In many cases, recycling or regenerating insulating oil is more cost-effective than complete disposal and refilling. Particularly with large volumes of oil, disposal, transport and replacement costs can be significantly reduced. 2. Can recycled transformer oil achieve the same quality as new oil?Yes. Certified recycled transformer oil meets the same requirements of IEC 60296 as new insulating oil and can be used as a technically equivalent substitute. 3. When should transformer oil be replaced or regenerated?Regeneration or replacement becomes advisable when key parameters such as the neutralisation number, interfacial tension, colour number or dielectric loss factor reach critical levels. An analysis can show the quality of the transformer oil. 4. Is it possible to treat insulating oil whilst the equipment is in operation?Yes. Modern processes enable drying, filtering, degassing or even complete regeneration, often directly on-site and in some cases even whilst the equipment is in operation. 5. What are the benefits of recycling insulating oil for businesses?Businesses benefit from lower costs, less waste, reduced CO₂ emissions and an improved sustainability record. At the same time, recycling supports environmental and ISO 14001 targets. |
This blog was first published on June 27, 2023 and updated on June 30, 2026.
