E20 Ethanol Blending: Costs and Benefits

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India has achieved around 20% ethanol blending in petrol, but concerns are emerging over whether the benefits from reduced crude oil consumption justify the economic, agricultural and environmental costs.
The debate centres on ethanol's lower energy content, diversion of farmland towards feedstock crops, rising imports of pulses and edible oils, and pressure on groundwater resources.

E20 contains approximately 20% ethanol and 80% petrol.
Ethanol has only about two-thirds the energy content of petrol by volume.
Therefore, a 20% ethanol blend does not displace 20% of petrol consumption on an energy-equivalent basis.
The effective displacement is estimated at around 14%.
The Petroleum Ministry states that E20 can reduce mileage by around 1–2% in calibrated vehicles and 3–6% in older vehicles.
The government has reported savings of around ₹1.97 lakh crore and substitution of about 316 lakh tonnes of crude oil since 2014-15 through ethanol blending.
However, crude oil import dependence has continued to remain high despite the expansion of ethanol blending.

In 2019, India moved ethanol imports from the free list to the restricted category for fuel blending.
Domestic distillers increasingly shifted ethanol towards fuel blending because oil marketing companies offered assured offtake and administered prices.
Industrial ethanol production declined, increasing dependence of pharmaceutical and chemical industries on imported ethanol.
At one point, imported ethanol accounted for more than half of ethanol consumed by these industries.
Ethanol becomes relatively economical compared with petrol when crude oil prices are substantially higher, with the article citing around $120–130 per barrel as the level at which the economics become more favourable.

In 2024-25, around 126 lakh tonnes of maize, or approximately 29% of total production, went to distilleries.
In states such as Maharashtra and Karnataka, farmland has reportedly shifted from pulses, soybean, millets and cotton towards maize.
This raises concerns over food security and competition between fuel and food uses.

India imported around 16 million tonnes of edible oil in 2024-25.
Pulses imports reached a record 7.3 million tonnes.
India also became a net importer of maize in 2024.
The increased use of maize for ethanol can intensify pressure on water resources.
The article cites an estimate that producing 1 litre of ethanol requires around 4,670 litres of water from maize and around 3,630 litres from sugarcane.
Distilleries additionally use around 3–5 litres of processed water per litre of ethanol.
This is particularly concerning because expansion of maize cultivation is occurring in regions dependent on hard-rock aquifers.

The article argues that the government's primary objective of ethanol blending should remain reducing petroleum import dependence rather than simply supporting the expansion of the distillery sector.
The government should provide a clear accounting of crude oil actually substituted by ethanol in both energy and volume terms.
The land and water footprint of ethanol production should also be assessed, including additional acreage brought under feedstock crops.
Excessive dependence on first-generation feedstocks such as maize and sugarcane can create competition with food crops and increase pressure on water resources.
Policy incentives should progressively shift towards second-generation biofuels derived from crop residues, agricultural waste and forestry waste.
The 2018 National Policy on Biofuels had envisaged greater use of such advanced feedstocks, but their expansion remains limited.
A comprehensive assessment should therefore consider not only crude oil savings but also food security, land use, water consumption, foreign exchange expenditure and environmental sustainability.