What’s good for a dielectric fluid is also good for the environment.


Mineral oil has been the predominant transformer fluid for the past century.  However, in order to meet today’s increased energy demands and offer environmentally-preferred solutions, utilities and their OEM partners are evaluating bio-based solutions that can deliver both the required thermal performance (e.g. high temperature capability and increased fire safety) as well as significant environmental benefits.



Natural ester environmental credentials

Natural ester transformer oil is made from renewable vegetable oils originating from plants which actually sequester CO2 during the crop growing process. Through the BEES® 4.0 lifecycle analysis, natural ester fluid has been shown to produce 56x less carbon emissions than mineral oil and is essentially carbon neutral.

Should a spill occur, the impact on the environment is minimal and spill remediation costs are reduced since natural ester transformer fluid is biodegradable and non-toxic and non-hazardous in soil and water.

Natural ester oil has achieved numerous industry validations including:

  • Environmental Protection Agency Environmental Technology Verification
  • Lowest environmental impact performance score by BEES® 4.0 lifecycle analysis
  • USDA Certified Biobased Product
  • Underwriters Laboratory and Factory Mutual Research Corporation Less Flammable Fluid Certification
  • 2013 Environmental Protection Agency’s Presidential Green Chemistry Award

Direct and indirect environmental benefits

Because natural ester fluid is a vegetable-oil based fluid, it has twice the flash and fire points compared to mineral oil making it a safer and more reliable dielectric fluid. In fact, there have been no known fires in more than a million transformers filled with natural ester fluid since the product was launched.

To address the sustainable supply chain initiatives of most organisations, natural ester fluid can help out there too. Since it can operate at 20°C warmer than mineral oil (or restated, transformers require 20°C less cooling), smaller unit designs can use less fluid and construction materials, yet maintaining the same or up to 20% more load capability, are possible.

Contact our team to help you improve your environmental footprint by incorporating natural ester transformer fluid into your power and distribution transformer fleets.