How does FR3 transformer oil price compare to mineral oil?

FR3, a natural ester fluid, is typically more expensive per liter than mineral oil due to different feedstock economics and specialized production and certification. However, total project cost can improve in some cases because FR3 offers higher fire safety and biodegradability, which may reduce requirements for fire protection or containment complexity in sensitive locations. Utilities also factor lifecycle benefits such as moisture tolerance and insulation aging performance. Final price depends on region, volume, and supply contracts.