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How is ethanol used in Sustainable Aviation Fuel?

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Ecology Impact

The transition to ethanol-based Sustainable Aviation Fuel (SAF) reduces the ecological risks of habitat destruction and oil spills associated with conventional crude oil extraction. However, the intensive cultivation of biofuel feedstocks like sugarcane can lead to land-use changes, soil degradation, and severe water depletion in ecologically fragile, water-stressed agricultural basins.

Science & Tech Angle

The Alcohol-to-Jet (ATJ) process is a thermochemical pathway that converts ethanol into aviation-grade fuel. It involves the dehydration of ethanol to produce ethylene, oligomerization to lengthen the hydrocarbon chains, and hydrogenation to saturate the molecules, producing synthesized hydrocarbons that meet the IS 17081 standard.

Climate Change Link

Utilizing SAF can reduce lifecycle carbon dioxide emissions by up to 80% compared to conventional jet fuel. This transition directly supports India's Nationally Determined Contributions (NDCs) under the Paris Agreement and helps fulfill international aviation emission reduction targets.

Sustainable Development

This initiative advances SDG 7 (Affordable and Clean Energy) and SDG 13 (Climate Action) by introducing low-carbon alternatives to a hard-to-abate sector. It also supports SDG 9 (Industry, Innovation, and Infrastructure) by building domestic refining capabilities and reducing India's heavy reliance on imported crude oil.

International Frameworks

Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA)
An International Civil Aviation Organization (ICAO) framework requiring airlines to offset CO2 emissions. India's targets of 1% SAF blending by 2027, 2% by 2028, and 5% by 2030 for international flights directly align with CORSIA.
Paris Agreement
An international treaty on climate change under which India has committed to reducing the emissions intensity of its GDP by 45% by 2030 (from 2005 levels) and achieving net-zero emissions by 2070.

Sources consulted

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