Daily Current Affairs

August 11, 2025

Current Affairs

E20 Blend Fuel: Benefits and Concerns

Context: India has mandated E20 petrol (20% ethanol, 80% petrol) and aims for E27 in the future, achieving the E20 milestone five years ahead of the original 2030 target. 

However, concerns are emerging over mileage loss, engine damage, and lack of consumer choice, especially for vehicles manufactured before 2023.

Relevance of the topic:

Prelims: About E20, Flex fuel vehicles.

Mains: E20 Fuel in India: Challenges, Concerns & Lessons from Brazil

Ethanol Blending

  • Ethanol Blending refers to the process of mixing ethanol, a biofuel derived from plant-based sources, with petrol to create a more sustainable and cleaner fuel. 
  • Ethanol is often produced from renewable sources such as corn, sugarcane, or other biomass. 
image 7

India's Ethanol Blending Programme

The Government of India launched the Ethanol Blended Petrol Programme in 2003 to promote ethanol use in transportation fuel. 

  • 2003: EBP launched in 9 States & 4 UTs with 5% ethanol blend (E5).
  • 2013: National Policy on Biofuels notified.
  • 2018: National Policy on Biofuels revised — target of 20% blending by 2030.
  • 2021: The target of 20% blending advanced to 2025-26.
  • 2023: E20 fuel introduced in select cities.
  • 2025-26: Pan-India rollout of E20 planned.

Objectives: 

  • Reduce Crude Oil Import Bill: India imports >85% of crude oil needs. Blending ethanol with petrol helps reduce dependence on non-renewable fossil fuels. 
  • Enhance Energy Security: Diversify fuel sources.
  • Lower Carbon Emissions: Ethanol contains oxygen which can improve the combustion of fuel. This aids the complete burning of fuel and lowers emissions of certain pollutants like Carbon dioxide and carbon monoxide. 
  • Waste Utilisation: Use damaged grains, surplus rice and stubble will reduce waste. 
  • Boost Farmer Income: Assured procurement of surplus crops and farm residue will boost farmers' income. 

What is E20 Fuel? 

  • E20 is a fuel blend that comprises 20% ethanol produced from plant products such as sugarcane, rice, and maize, and 80 % gasoline. 
image 8

Challenges and Concerns with E20 in India: 

  • Engine Compatibility Issues:
    • The majority of vehicles manufactured before 2023 are designed for E10 fuel only. 
    • Ethanol’s higher water content can corrode metals and damage non-ethanol-rated rubber seals, valves, and pistons.
    • Cold-start problems in winter due to ethanol’s higher ignition temperature.
  • Performance and Mileage Loss: Ethanol has a lower energy density (around 33% lower calorific value) than petrol and may cause a marginal decrease in mileage (fuel economy). 
  • Lack of Consumer Choice: Petrol pumps rarely disclose the blending percentage. No option for customers to buy pure petrol or lower blends like E10. 
  • No Price Incentive: Unlike Brazil, where ethanol is 25-35% cheaper, E20 in India is priced at parity with petrol, reducing consumer motivation.
  • Warranty and Liability Risks: Car manuals of popular models (Hyundai i20, Mahindra Thar, etc.) explicitly warn against using >10% ethanol; damage may void warranties.
  • Rapid Policy Transition: Moving from E10 to E20 in a short time frame has created adjustment challenges for both manufacturers and consumers.
  • Infrastructure and Awareness Gaps: Limited roll-out of flex-fuel compatible vehicles and inadequate readiness of service and repair networks to address ethanol-related issues. 
  • Feedstock and Environmental Concerns: High dependence on water-intensive crops like sugarcane for ethanol production may exacerbate water scarcity and raise food-versus-fuel debates.

Case Study: Brazil’s Ethanol Blending Success

  • Brazil is a global leader in ethanol fuel adoption, offering a valuable model for India’s E20 programme. It launched its Ethanol blending scheme (EBS) in 1975 in response to the global oil crisis. 

The scheme leveraged Brazil’s abundant sugarcane resources to create a sustainable alternative to petroleum fuels. Key points of Brazil’s EBS: 

  • Phased Rollout: Gradual progression from E10 to E27, alongside introduction of E100 (pure ethanol), avoiding sudden stress on existing vehicle stock.
  • Flex-Fuel Technology: Cars capable of running on any blend of petrol and ethanol; by the late 1980s 90% of new cars were ethanol-compatible.
  • Transparent Consumer Choice: Fuel pumps display ethanol content; consumers select blends based on price and preference.
  • Economic Incentives: Ethanol priced 25-35% lower than petrol at the pump.
  • Public Engagement: Strong awareness campaigns highlighting both environmental and performance benefits.

Way Forward

  • Phased Rollout: Introduce E15 as an intermediate step for older fleets before full E20 coverage.
  • Mandate Flex-Fuel Engines: All new vehicles should be compatible with higher ethanol blends.
  • Transparent Labelling: Display blending levels at every pump.
  • Introduce Price Incentives: Ensure ethanol blends are cheaper to encourage voluntary adoption.
  • Consumer Awareness Campaigns: Address myths, highlight benefits, and explain precautions.
  • Independent long-term studies on E20’s impact on older engines.

India’s ethanol push is a strategic step towards energy self-reliance and climate goals, but its success will depend on harmonising policy ambition with market readiness. 

Also Read: Impact of Ethanol Production on Environment 

Fishing Cat 

Context: India is home to 15 species of the cat family (Felidae). Smaller wild cats like the Fishing Cat remain lesser-known yet ecologically significant. The species faces growing threats from habitat loss and human-wildlife conflict, particularly due to the degradation of wetlands.

Relevance of the Topic: Prelims: Key facts about Fishing Cat. 

Fishing Cat

image 6
  • Description: An elusive nocturnal cat, twice the size of the domestic cat. It weighs 7-12 kgs, and has a greyish brown fur lined with black spots. 
  • Behaviour: 
    • In its territory, this cat is often the apex predator meaning no other creature preys on it. 
    • The diet is primarily fish; it also hunts on rodents, chickens, small animals. 
    • Well adapted to water with webbed paws, a waterproof coat, ability to swim underwater, and claws that stay out to help grip mud and catch fish.
  • Habitat: Wetlands i.e., river floodplains, mangroves, marshes, swamps.
  • Distribution in India: Terai region, marshes of western India, Sundarbans, East coast, Chilika Lake (Odisha), Sri Lanka; rediscovered in Keoladeo National Park (Rajasthan).
  • The fishing cat spends 50% of its hunting time standing, sitting or crouching near the edge of water. Barely 5% of hunting time is spent submerged in water. 

Protection Status: 

  • IUCN Red List: Vulnerable
  • CITES: Appendix II (trade regulated to avoid threats to survival)
  • Indian Wildlife (Protection) Act 1972: Schedule I (the highest level of legal protection in India)

Fishing cat numbers are rapidly declining in the Sundarbans and were once thought extinct in Rajasthan until recent sightings in Keoladeo National Park.

Factors responsible for Decline:  

  • Habitat loss: The decline is largely on account of habitat loss. It has been estimated that 30-40% of India’s wetlands have been lost or severely degraded in the last four decades. Protecting wetland ecosystems is therefore crucial for the fishing cat. 
  • Human encroachment on wetlands and revenge killings of cats by humans. 

Scientific Research & Monitoring:

  • Fishing Cat Project (Tiasa Adhya): Extensive surveys, community engagement.
  • Wildlife Institute of India’s Godavari Estuary Project: GPS collar tracking in Coringa Wildlife Sanctuary (Andhra Pradesh) to map habitat use and human interaction zones.
  • Community-Based Conservation: Awareness campaigns to reduce animosity and promote co-existence.

Ocean Model affirms Fukushima Wastewater release is Safe

Context: A recent simulation study by Japanese researchers using an ocean circulation model has affirmed that Fukushima wastewater release is safe. 

Relevance of the Topic: Prelims: Key idea about Nuclear contamination; Key facts about Tritium. 

Japan releases wastewater from Fukushima Nuclear Plant

  • An earthquake followed by a tsunami in 2011 wrecked the Fukushima Daiichi Nuclear Power Plant in Japan, destroying its cooling system and causing reactor cores to overheat and contaminate water within the facility with highly radioactive material.
  • Since the disaster, power plant company TEPCO has been pumping in water to cool down the damaged reactors' fuel rods. Every day the plants produce contaminated water which is stored in around 1,000 tanks, which are already filled to 98% of their 1.37 million-ton capacity. 
  • This water has been treated to remove most radioactive contaminants but still contains tritium (a radioactive isotope of hydrogen) and Carbon-14 which are difficult to separate from water.
  • In 2021, Japan’s government announced plans to release over one million tonnes of contaminated water from the Fukushima nuclear plant into the Pacific ocean over the next 30 years.

Rationale to release wastewater

  • There is a lack of available space for additional storage tanks, as well as due to safety risks and expense of managing the accumulating water. 
  • Japan states that the water has been treated and diluted before releasing it into the ocean. The water contains about 190 becquerels of tritium per litre, below the World Health Organisation drinking water limit of 10,000 becquerels per litre (Bq/L). (Becquerel is a unit of radioactivity). 

Associated Concerns: 

The release has raised concerns among China and South Korea, as well as environmental and anti-nuclear groups regarding its potential impact on public health (increase the risk of cancer), seafood and marine environment. 

  • Waste water released into the ocean off Fukushima will not be contained to waters surrounding Japan. It will be carried by ocean currents, particularly the cross-Pacific Kuroshio current, to other parts of the world.
  • Marine animals that migrate great distances, phytoplankton (free-floating organisms) and microplastics can all act as Trojan horses to spread radionucleotides far away. 
image 11

Findings of the latest Research by Japanese Researchers:

  • Low radiation levels: As the nuclear facility is releasing tritiated water gradually, the Tritium levels (radiation level) is even lower than that due to natural and historical sources. The peaks from the routine discharge never exceed 0.002 Bq/L, which is 25x (25 times) lower than natural background radiation levels.
  • Impact of Warming: Warmer oceans might shift the Kuroshio Current a little North and strengthen eastward flow, speeding up tritium dispersion in the mid-Pacific. However, Tritium concentrations will still remain three orders of magnitude below detection threshold.

Since, Tritium has a half life of around 12 years, natural decay reduces long-term risk. Even under extreme warming or a worst-case eddy transport scenario, the levels of the Tritium would remain undetectable across the wider Pacific Ocean by 2099. 

About Tritium:

  • Tritium is a radioactive isotope of Hydrogen with a half-life of about 12 years. Hydrogen has three isotopes:
    • Protium- one proton and zero neutron
    • Deuterium - one proton and one neutron
    • Tritium - one proton and two neutrons
  • Occurrence: Naturally occurring tritium is extremely rare on Earth. The atmosphere has only trace amounts, formed by the interaction of Nitrogen with cosmic rays. It can be produced artificially as a low-abundance byproduct in nuclear reactors.
  • Uses: 
    • Energy source in radioluminescent lights for watches, gun sights, numerous instruments and tools.
    • Radioactive tracer in a medical and scientific setting.
    • Nuclear fusion fuel, along with more abundant deuterium, in tokamak reactors and hydrogen bombs.
  • Concerns: Tritium is easily absorbed by the bodies of living creatures and rapidly distributed via blood. 

Trending now

India Invokes Emergency Powers to Secure LPG Supply Amid West Asia Tensions
China’s New Antarctic Law and Implications for Global Polar Governance
India–EU Deepen Partnership in Peaceful Nuclear Science and Fusion Energy
Solid Waste Management Rules, 2026: Strengthening India’s Waste Governance Framework