Now the turn of diesel cars! Government made plan for 15% isobutanol blending

After the success of blending E20 ethanol in petrol, the Indian government is now preparing to mix isobutanol in diesel. Union Road Transport and Highways Minister Nitin Gadkari had recently said that the government is working towards blending up to 15 percent isobutanol in diesel. This step is part of reducing the country's dependence on crude oil imports, strengthening energy security and promoting clean fuels.

Ethanol cannot be blended directly into diesel, hence isobutanol is being prepared from ethanol. Isobutanol is a better biofuel, which can mix better with diesel. Positive results have been found in pilot projects. Many companies are going to start trials of 2 percent blend. This initiative can have a bigger impact than E20 considering the consumption of diesel, because the consumption of diesel in India is almost double that of petrol. With this, farmers are expected to get additional income, lower import bill and reduction in pollution.

development so far

Attempts at ethanol-diesel blending were unsuccessful because ethanol does not mix well with diesel and creates problems for the engine. After this the government focused on isobutanol. ARAI (Automotive Research Association of India) started the study of 10 percent blending in 2025. Pilot trials of 2 percent isobutanol-diesel blend with organizations like HPCL, BPCL, Praj Industries and Tata Motors are scheduled to begin from Q2 FY2027. Many generator sets have been successfully run on 100 percent ethanol and isobutanol. This can make India the first big step in the diesel biofuel program.

What did Gadkari say?

Nitin Gadkari has clarified that ethanol cannot be blended directly into diesel, hence we are preparing isobutanol from ethanol. Isobutanol can become an alternative to diesel. We are moving towards 15 percent isobutanol blending. Referring to the good results of the pilot demonstration, he said that the engines can run on these fuels. This step is important for energy self-reliance, reducing imports and clean transportation. Gadkari had also discussed this at the launch of Maruti Suzuki WagonR flex-fuel.

Blend Percentage and Rollout

The government will initially conduct trials of 2 percent blend, which can later increase to 15 percent. Compulsory blending may start from 2027. Companies like Praj Industries are increasing production capacity.

Advantages:

Higher energy density: Better than ethanol, less impact on mileage.
Low Corrosive: Safe for engines, pipelines and storage.
Eco-Friendly: Low emissions, clean fuel.

Potential disadvantages:

• There may be slight mileage reduction in some vehicles in the initial phase.
• A lot of money will be invested in production scale-up and infrastructure.