Beyond the Pump: Ethanol Blending as a Cornerstone of Energy Security

Ethanol-blended petrol will help India achieve its Net Zero target by 2070. (Image:Reuters)

 Introduction: Ethanol is a clear, colourless, volatile, and flammable organic chemical compound having a peculiar odour. It is a biofuel sourced from sugarcane, corn, and agricultural waste. In recent times, policymakers in India have repeatedly stressed the importance of blending of ethanol with petrol to ensure energy security as it reduces the country's increasing dependence on the import of fossil fuels. Currently, the government has a target of 20% ethanol blending (E20) by 2025-26 (from 12% in 2023).

Sources of Ethanol:

• 1st Generation Ethanol: It is the most prevalent type of ethanol in use today, produced from sugar and starch containing crops-also called food-based feedstocks.

1. Sugar-based Crops: Ethanol is derived from sugar beets, molasses (byproduct in sugal mills) and sugar sorghum. Due to high content of fermentable sugars in these crops, sugar can be directly coverted into ethanol. 
2. Starch-based Crops: Here, enzymes break down starch into simple sugars like glucose before fermentation. Examples of prominent crops include corn, wheat, rice, and barley.

• 2nd Generation Ethanol: 2nd generation ethanol is cellusic in nature, produced from non-food biomass through a complex process that breaks down cellulose and hemicellulose into sugars before fermentation.

1. Agricultural Residues: These include corn stover, wheat and rice straw, sugarcane bagasse which are left over after harvesting.
2. Forestry and Wood Residues: These include waste products from lumbering industry such as wood chips and saw dust, along with residues from trees like poplar and willow.
3. Energy Crops: These are crops exclusively grown for biofuel production, specially on lands unfit for foodgrain production e.g switchgrass which is grown for its high biomass yield.

• Chemical Synthesis: It involves a process called ethylene hydration which reacts ethylene with petroleum and natural gas at high temparatures and presssures to produce ethanol.

Stages of Ethanol Production:

• Milling: Feedstock is crushed into a fine powder or meal which makes the starch more usable for the next steps e.g sugarcane stalks are crushed to extract the juice.
• Liquefaction: The meal is mixed with water to form a mash which is then heated. This process prepares the mash for saccharification.
• Saccharification: An enzyme called gluco-amylase is added to the cooled mash that is converted into simple, fermentable sugars. 
• Fermentation: The mash is transferred to fermentation tanks where yeast cosumes the simple sugars in the mash and produces ethanol and carbon dioxide as byproducts in the absence of oxygen.
• Distillation: The fermented mixture is heated to produce ethanol vapour which is condensed into a liquid, purifying the ethanol in the process.
• Dehydration: Molecular sieves remove the remaining amount of water from the ethanol. Because, in order to be used as fuel, the ethanol must be nearly anhydrous (water-free).
• Denaturing: A small amount of a denaturant (normally gasoline) is added to the fuel-grade ethanol which makes it unfit for human consumption.

Significance of Ethanol for India:

• Energy Security:

1. Blending ethanol with petrol will reduce India's heavy reliance on imported crude oil which is often vulnerable to supply shocks and geopolitical tensions. Reduced import dependence will save billions of dollars in foreign exchange.
2. Ethanol blending programme also aligns with the Aatmanirbhar Bharat initiative by strengthening India's position in the international energy market.

• Supporting Rural Economy and Agriculture:

1. Ethanol production provides a stable source of income to sugarcane farmers when the production of foodgrains fail. This contributes to the goal of doubling of farmers' income.
2. Use of agricultural waste for biofuel production manages agricultural residue and may help reduce the practice of stubble burning.
3. Establishment of distilleries and ethanol production facilities in rural areas will create non-farm jobs and help boost the rural economy.

• Environmental Sustainability:

1. As ethanol is a clean fuel compared to petrol, promotion of ethanol blending will decrease the emission of carbon dioxide and other pollutants, helping India meet its Net Zero target by 2070.
2. Moreover, promotion of ethanol will improve air quality in urban India and ameliorate public health.

Challenges in Ethanol Production:

• Environmental Challenges:

1. The diversion of food crops for biofuel production may lead to food shortages which is a major concern for the food security of India.
2. Ethanol production from water-intensive crops like sugarcane may put strain on the already depeleted groundwater in some parts of India.
3. Waste generated from the distillation process can contaminate local waterbodies, soil, and environment without proper treatment.

• Economic Challenges:

1. Higher cost of ethanol production makes it diffcult to reach economies of scale, impeding a smooth transition from fossil fuels.
2. Volatile prices of agricultural feedstocks can generate fluctuations in the availability of suitable raw material for ethanol production.
3. Setting up distilleries and associated infrastructure is capital intensive in nature which may not be viable in rural areas struggling with economic distress post COVID-19 pandemic.

• Technological and Logistical Challenges:

1. Most vehicles are not designed to run on ethanol-blended fuel, requiring massive upgrade.
2. The seasonal nature of agricultural feedstocks implies that the supply of ethanol may not be constant throughout the year.

Key Government Schemes and Policies:

• The Ethanol Blended Petrol Programme (EBP):

1. Objective: To achieve ethanol blending in petrol for reducing India's import dependence on imported crude oil.
2. Target: 20% ethanol blending (E20) by 2030, later advanced to 2025-26.

• National Policy on Biofuels, 2018:

1. Expanded Feedstock: Surplus food grains like maize and demaged food gains unfit for human consumption.
2. Emphasizes the promotion of 2nd generation ethanol produced from non-food agricultural residues and waste.
3. Categorizes biofuels into 1st, 2nd, and 3rd generations to provide targeted incentives.

• Financial Incentives:

1. Ethanol Interest Subvention Schemes: Provides financial assistance to entrepreneurs for setting up new distilleries or expanding existing ones.
2. The GST on ethanol for EBP has been cosiderably reduced.
3. Fixed and Remunerative Prices: Administered price mechanism for the procurement of ethanol by public sector oil marketing compaines.

• PM-JI-VAN Yojana:

1. Objective: Development of 2nd generation biofuel.
2. Mechanism: Financial help to bio-ethanol projects which produce ethanol from cellulosic biomass and other agricultural residues.

Way Forward:

• Promote ethanol production from non-food sources to ensure food security.
• Provide suitable measures to minimise pollution from the waste generated by distilleries.
• Strengthen existing infrastructure for ethanol production in order to reach economies of scale.
• Ensure uninterrupted supply of agricultural feedstock to mitigate the effects of price volatility.
• Retrofit vehicles in order to make them adaptable to ethanol-blended fuel.

Conclusion: Ethanol-blended fuel can become a gamechanger in India's journey towards a carbon neutral future. By addressing the challenges associated with smooth transition to ethanol, India can build a green future and inspire the world to follow suit.