Ethanol-Blended Diesel Fails Safety Tests Over Flash Point Drop, Government Informs Parliament
Scientific evaluations conducted by public-sector oil marketing companies have revealed that ethanol-blended diesel fails to meet mandatory safety specifications due to a steep reduction in the fuel’s flash point. Minister of State for Petroleum and Natural Gas Suresh Gopi shared these findings in a written reply to Parliament, noting that the technical issue limits the wider adoption of ethanol-diesel blends for the time being.
What Happened
Public-sector oil marketing companies (OMCs), through their research and development centres, partnered with accredited laboratories and vehicle manufacturers to assess the feasibility of blending ethanol with diesel. The technical assessments concluded that adding ethanol caused the flash point of the diesel to drop drastically, failing required safety benchmarks. The minister also clarified that isobutanol is not currently being blended with diesel.
Key Highlights
- Safety Standards Unmet: Blending ethanol into diesel significantly lowers the fuel’s flash point, falling short of safety criteria.
- Petrol Blending Baseline: India’s ethanol initiative continues to focus on petrol, where the current blending target is 20 percent.
- No Expansion Beyond 20% Yet: The government has not taken a decision to increase ethanol blending in petrol past 20 percent, noting that any future increase will require technical studies and stakeholder consultations.
- Supply Surplus: In a September 2025 tender for the 2025–26 supply year seeking 10.5 billion litres of ethanol, suppliers offered roughly 17.6 billion litres. OMCs allocated 10.485 billion litres across 378 suppliers.
- Alternative Uses Explored: The government is examining ethanol as a clean cooking alternative to help absorb surplus production and reduce liquefied petroleum gas (LPG) import dependence.
Why This Matters
India has been seeking ways to expand domestic ethanol consumption to absorb growing domestic capacity and cut fossil fuel import reliance. While petrol blending has advanced toward a 20 percent target, applying the same blending model to diesel faces clear safety constraints due to altered physical and chemical properties like flash points. To address domestic production surplus, authorities are looking at alternative avenues, such as household cooking fuels.
What to Watch Next
The LPG Equipment Research Centre—a joint venture between Indian Oil, Hindustan Petroleum, and Bharat Petroleum—is currently working alongside public-sector OMCs to evaluate and develop ethanol-based cooking fuel options. Additionally, any potential changes to petrol blending levels beyond 20 percent remain subject to future scientific research and formal consultations with automakers, refiners, and research bodies.
Frequently Asked Questions
Why did ethanol-blended diesel fail safety evaluations?
Evaluations showed that mixing ethanol with diesel causes the fuel’s flash point to drop drastically, making it non-compliant with standard safety specifications.
Is the government expanding ethanol blending in petrol beyond 20 percent?
No decision has been made to exceed the 20 percent blending level in petrol. Any future move will depend on technical assessments and consultations with OMCs, automakers, and research institutions.
What alternative applications for surplus ethanol are being considered?
The government is actively exploring ethanol as an alternative clean cooking fuel to reduce LPG import dependence and utilize surplus domestic distillation capacity.
Source: Based on statements provided by Minister of State for Petroleum and Natural Gas Suresh Gopi to Parliament, reported by PTI via The Times of India.