Union Minister for Road Transport and Highways Nitin Gadkari has announced that the government is actively developing a plan to allow up to 15 per cent isobutanol blending in diesel, positioning the biofuel as a viable substitute for conventional diesel and a key lever to reduce India's dependence on crude oil imports. The disclosure came on 4 June during the launch of India's first flex-fuel passenger vehicle by Maruti Suzuki India Limited, held on the occasion of World Environment Day.

Why Isobutanol, Not Ethanol

Gadkari explained that ethanol cannot be blended directly with diesel — a technical constraint that has pushed the government toward isobutanol, which is derived from ethanol. 'Isobutanol can be an alternative to diesel. We are also working on allowing 15 per cent isobutanol blending in diesel,' the minister said at the event, which was also attended by Union Minister for Petroleum and Natural Gas Hardeep Singh Puri.

Testing of isobutanol has already commenced for construction and agricultural equipment, with initial trials reportedly demonstrating the fuel's technical viability. Gadkari added that he had launched two generator sets running entirely on ethanol and isobutanol, calling it proof that engines can be engineered to operate on these alternative fuels.

Part of a Broader Clean Energy Push

The isobutanol blending initiative sits within a wider government strategy to diversify India's energy basket and reduce fossil fuel imports. Gadkari highlighted the government's simultaneous focus on ethanol, sustainable aviation fuel (SAF), bio-CNG, methanol, biodiesel, LNG, hydrogen, and electric mobility as complementary pillars of the country's clean energy transition.

Notably, despite significant strides in alternative fuels — including the near-achievement of the 20 per cent ethanol blending target in petrol — India continues to import large volumes of fossil fuels, making energy diversification a strategic priority.

Call to Automakers on Flex-Fuel

At the same event, Gadkari urged automobile manufacturers to accelerate development of flex-fuel technologies and explore converting existing Euro-VI vehicles into flex-fuel-compatible models through authorised service centres. The launch of Maruti Suzuki's flex-fuel passenger vehicle marks a milestone in that direction, signalling growing industry alignment with the government's alternative fuel roadmap.

What This Means for India's Oil Import Bill

India spends hundreds of thousands of crores annually on crude oil imports, and diesel accounts for a significant share of domestic fuel consumption. A 15 per cent isobutanol blend in diesel, if scaled nationally, could meaningfully reduce the import burden while simultaneously creating demand for domestically produced biofuels. The policy, once finalised, is expected to benefit the agricultural sector as a feedstock supplier and reduce emissions from heavy transport and farm equipment. Further regulatory and technical guidelines are awaited before the programme moves to commercial rollout.