INDIA'S BIOFUEL STRATEGY AND ENERGY SECURITY: LIMITATIONS OF ETHANOL BLENDING

01 Nov 2026

Tags: Economy   Infrastructure   Energy Sector

Source: The Indian Express

Context: India is promoting higher ethanol blending in petrol, including E100 (100% ethanol), following amendments to the Central Motor Vehicles Rules, 1989, allowing vehicles to operate on pure ethanol.

• India has already achieved the E20 target (20% ethanol blending in petrol), aimed at reducing crude oil imports, saving foreign exchange and strengthening energy security.
• However, the article argues that an ethanol-centric strategy has limited potential to reduce overall crude oil dependence because diesel accounts for a much larger share of petroleum consumption than petrol.

India's Dependence on Crude Oil

• India imports over 80% of its crude oil requirements, exposing its economy to international price volatility and geopolitical disruptions, as highlighted by the ongoing West Asian conflict.
• Reducing crude oil imports is important for energy security, foreign exchange conservation and economic stability.

Limitations of an Ethanol-Centric Biofuel Strategy

• Difference in Petrol and Diesel Consumption
  • Share in petroleum products: Petrol accounts for only 15–18% of petroleum products obtained from a barrel of crude oil, whereas diesel accounts for approximately 44–45%.
  • Consumption pattern: Between FY2020–21 and FY2024–25, India consumed approximately 503 million tonnes of diesel, compared with 200 million tonnes of petrol.
  • Economic significance: Diesel is essential for freight transportation, agriculture and industrial logistics; hence, its demand is expected to remain substantial.
  • Consequently, ethanol blending addresses a relatively smaller component of India's overall petroleum demand.
• Limited Impact of E20 on Crude Oil Imports
  • Impact on petrol consumption: Modelling that accounts for ethanol's lower energy content and the resulting reduction in vehicle fuel economy suggests that E20 could reduce petrol consumption by approximately 15.56%.
  • However, this reduction cannot be equated with an equivalent decline in crude oil imports because crude oil refining produces multiple products, including petrol, diesel, Liquefied Petroleum Gas (LPG), Aviation Turbine Fuel (ATF) and naphtha.
  • Refining constraints: Although refineries can adjust product yields to some extent, increasing diesel production is technically constrained; therefore, reduced petrol demand does not automatically reduce crude oil processing proportionately.
  • Three distinct outcomes: Policymakers must distinguish between petrol displaced by ethanol, expenditure avoided on petrol supply and actual reduction in crude oil imports.

Need to Strengthen Biodiesel Blending

• Policy gap: Biodiesel blending has lagged behind ethanol despite an earlier target of 5% blending.
• Feedstock challenges: Earlier efforts to promote non-edible oil feedstocks and used cooking oil faced difficulties in collection, availability and commercial viability.
• Required interventions: Greater investment in research and development, improved feedstock collection mechanisms, sustainable supply chains and commercially viable production technologies is necessary.
• Strategic importance: Since diesel constitutes a much larger share of petroleum consumption, biodiesel can contribute more directly to reducing dependence on diesel-derived fossil fuels.

Way Forward for India's Biofuel Strategy

• Diversify biofuel strategy: Balance ethanol blending with greater emphasis on biodiesel to address both petrol and diesel consumption.
• Strengthen feedstock ecosystem: Develop reliable collection networks for used cooking oil and promote sustainable non-edible oilseed cultivation.
• Promote research and development: Improve biofuel production efficiency, feedstock conversion technologies and commercial viability.
• Improve policy assessment: Measure biofuel success through actual reductions in crude oil demand, import expenditure and foreign exchange outflows rather than blending percentages alone.
• Adopt a comprehensive energy strategy: Integrate biofuels with electric mobility, public transport, fuel efficiency and alternative energy sources.

Important Concepts for UPSC

Ethanol Blending

• Ethanol is an alcohol-based biofuel generally produced through fermentation of sugarcane, maize and other biomass.
• E20: Petrol containing 20% ethanol and 80% petrol by volume.
• E100: Fuel consisting of 100% ethanol.
• Benefits include reduced petrol consumption, lower dependence on imported crude oil and potential reduction in certain vehicular emissions.
• Limitation: Ethanol has lower energy content than petrol, which can affect fuel economy and requires compatible vehicle technology.

Biodiesel

• A renewable diesel substitute generally produced by converting vegetable oils, animal fats or used cooking oil through transesterification.
• Can be blended with conventional diesel to reduce fossil diesel consumption.
• Common feedstocks include non-edible oilseeds such as jatropha, used cooking oil and other waste oils.
• Its large-scale adoption depends on sustainable feedstock availability, collection infrastructure and production economics.

Ethanol vs Biodiesel

Parameter	Ethanol	Biodiesel
Conventional fuel replaced	Petrol	Diesel
Major feedstocks	Sugarcane, maize, biomass	Vegetable oils, used cooking oil, animal fats
Main application	Petrol engines	Diesel engines
India's progress	Relatively advanced	Lagging behind
Strategic relevance	Reduces petrol demand	Addresses larger diesel demand