On 7 November 2026, the Ministry of Petroleum and Natural Gas put out a detailed statement that is part fuel-quality report, part procedural argument. The Government of Karnataka's food and legal-metrology department had said that petrol at certain retail outlets in the state contained 26% to 31% ethanol. The three public-sector oil marketing companies (OMCs), Indian Oil (IOCL), Bharat Petroleum (BPCL) and Hindustan Petroleum (HPCL), replied that those claims are not supported by tests done under the prescribed procedure. The Ministry added its own data: 893 E20 samples from 27 States and Union Territories, all within the permitted ethanol range.
Who is right on those particular outlets is a question for a joint, properly documented re-test, and the Ministry's own account is that of one party to the dispute. For an exam aspirant, the lasting value lies elsewhere. The episode shows how India decides what is in a litre of petrol: who may draw a sample, what the standard is, which laboratory test counts, and why a number from the wrong test can mislead. It also gives a reason to revisit the ethanol-blending roadmap that started it all.
What the release says
The key points, in the order PIB gives them:
- The Karnataka release claimed ethanol of 26-31% in petrol at some outlets. The OMCs say E20 supplied by them, including in Karnataka, conforms to IS 17021, the Bureau of Indian Standards (BIS) specification for ethanol-blended petrol.
- The OMCs object to the sampling procedure and test method used in an October 2026 exercise. They say samples were drawn without OMC representatives, that they have not received the retention samples, outlet-wise details or laboratory reports, and that the findings rest on a third-party laboratory certificate rather than a laboratory specified under the Control Order.
- Joint quality monitoring by the OMCs and the Centre for High Technology (CHT), a body under the Petroleum Ministry, tested 893 E20 samples drawn from IOCL (330), BPCL (280) and HPCL (283) depots and retail outlets. All 893 were within the prescribed range of 19-21% ethanol.
- In Karnataka, all 56 samples, from several locations and all three OMCs, showed 19% to 20%, with an average of 19.30%.
- The OMCs have asked the state for the full sampling papers and counterpart samples, and for joint sampling and independent testing by the referee method.
How a fuel sample is supposed to be taken
Fuel retailing in India sits under a Control Order: the Motor Spirit and High Speed Diesel (Regulation of Supply, Distribution and Prevention of Malpractices) Order, 2005, issued under the Essential Commodities Act, 1955. The OMCs' Marketing Discipline Guidelines (MDG) 2024 supplement it. Together they prescribe a chain-of-custody procedure that is worth knowing in outline:
- Six one-litre samples are drawn from the outlet.
- Two go to the dealer, against a written acknowledgement.
- Two are retained by the oil company or the inspecting department.
- Two go to a laboratory specified in Schedule III of the Control Order, or one notified in the Official Gazette.
- Labels are jointly signed, and results are sent to both the dealer and the oil company within a set time.
The logic is the same as in any investigation involving physical evidence. If the dealer is accused of selling bad fuel, he must be able to test his own samples. If the result is disputed, the retained pair allows a referee test. Break the chain, and the result becomes hard to defend in either direction. That is the heart of the OMCs' complaint, and, in fairness, it is also the reason a joint re-test is the sensible next step for both sides.
The legal ground is also worth a line. Petroleum and petroleum products are a Union subject (Entry 53 of the Union List), while the Essential Commodities Act is a Concurrent List law that States also enforce. That is why a state department can inspect pumps even though the fuel specification is set nationally.
How ethanol content is measured
A reading of "26-31% ethanol" is a claim about a test method as much as about petrol. IS 17021:2018, as amended (Amendment No. 3, August 2025), says ethanol content in E20 must be found by one of three routes:
| Method | What it does |
|---|---|
| FTIR (Fourier Transform Infrared Spectroscopy), ASTM D5845 | Shines infrared light through the sample; ethanol absorbs at characteristic wavelengths, and the absorbance gives the percentage |
| Water extraction, Annex C | Shake the fuel with water; ethanol dissolves in the water layer, so the change in volume of the water layer shows how much ethanol was present |
| Gas chromatography, ASTM D4815 / D6839 | Separates the components in a heated column and measures each; the sample must first be diluted 1:1 with oxygenate-free petrol, and the result corrected against an E10 certified reference material |
The OMCs' technical point is that the Karnataka certificates say only "Ethanol % by Gas Chromatography". They do not show the standard method, the dilution or the reference material. Without those, the OMCs say, the figures cannot be independently verified. This is a general lesson in measurement: the same instrument gives different answers if the sample is prepared differently.
The release also raises a density check. The certificates quoted densities of 0.742 to 0.749 g/cc, while E20 samples tested by the OMCs in earlier surveys came in at 0.752 to 0.760 g/cc. Ethanol is denser than petrol (about 0.79 g/cc against roughly 0.72 to 0.77 for petrol), so a sample with more ethanol should read higher, not lower. This is a simple physical cross-check, and a good example of how a number can be tested against another property of the same fluid. It is an argument made by the OMCs; a referee test is what would settle it.
Memory line: Control Order 2005 (Essential Commodities Act) = how to sample. IS 17021 (BIS) = what the fuel must be. Referee method = how to settle a dispute.
The roadmap: from E5 to E20
The sampling row matters because India has made a large public bet on blending. The milestones:
- 2001: pilot ethanol-blended petrol programme begins.
- June 2018: the National Policy on Biofuels, 2018 is notified (4 June 2018) by the Petroleum Ministry, replacing the 2009 policy of the Ministry of New and Renewable Energy. It set an indicative 20% ethanol blend target.
- June 2021: the NITI Aayog roadmap for ethanol blending in India 2020-25 is released on World Environment Day (5 June), laying out a path to E20.
- 18 May 2022: the Union Cabinet approves amendments to the 2018 policy: more feedstocks allowed, and the 20% target advanced to Ethanol Supply Year (ESY) 2025-26 from 2030.
- June 2022: E10 is achieved, five months ahead of the November 2022 deadline.
- ESY 2025-26 (the ESY runs November to October; this one ended 31 October 2026): PSU OMCs procured 1,089 crore litres of ethanol and blended 1,134 crore litres against petrol sales of about 5,673 crore litres, which works out to about 20%, the national target.
For a deeper walk through the programme, see our earlier explainer on ethanol blending and the E20 milestone.
Feedstocks: first and second generation
Ethanol (C₂H₅OH) is made by fermenting sugars. The source decides the label.
- First-generation (1G) ethanol uses food-crop material: sugarcane juice, B-heavy and C-heavy molasses (by-products of sugar manufacture), and grains such as maize and surplus or damaged foodgrain.
- Second-generation (2G) ethanol uses non-food biomass: crop residues such as rice straw and sugarcane bagasse. India's flagship 2G plant at Panipat, Haryana, was dedicated to the nation on 10 August 2022, World Biofuel Day, and is meant to turn paddy stubble (parali) into fuel instead of smoke.
The Ministry's own August 2025 note records that procurement prices have risen: the average cost for ESY 2024-25 was about ₹71.32 a litre, with C-heavy molasses ethanol up from ₹46.66 (ESY 2021-22) to ₹57.97 and maize ethanol from ₹52.92 to ₹71.86. That is higher than the cost of refined petrol, which is why critics say consumers are not seeing a saving at the pump. The government's answer is that the programme is justified on energy security, farm income and emissions, not on pump price alone.
The claims on each side
What critics say. The Karnataka statement, as quoted in the release, put the annual consumer cost at about ₹62,000 crore in lost mileage and ₹39,000 crore in vehicle repairs, around ₹1.01 lakh crore in all.
What the Ministry replies.
- Fleet evidence. More than 30 crore two-wheelers and 4 crore four-wheelers have run on E20 for over three years, and over 6 crore people refuel every day. A widespread fault would, it says, have shown up as breakdowns.
- Mileage. E20-calibrated vehicles may lose about 1-2% of mileage, others 3-6%, depending on category and calibration. A blanket 10% loss, the Ministry says, is not a scientifically established figure. (These are the numbers from its 12 August 2025 note, which said older vehicles may need rubber parts and gaskets replaced earlier.)
- Octane. Ethanol's octane number is about 108.5 against 84.4 for petrol, which suits high-compression engines. The 2025 note cited pump petrol at RON 91 moving to about 95 with E20.
- Cumulative benefits since ESY 2014-15: forex savings above ₹1.97 lakh crore; about 316 lakh tonnes of crude oil substituted; about 952 lakh tonnes of CO₂ avoided; over ₹1.66 lakh crore paid to farmers.
- Blending is automated. Calibrated proportioning at refineries and depots, not manual mixing, and the OMCs have no commercial reason to over-blend, since each extra litre of ethanol costs them more.
Both sets of numbers are claims until independently tested, and the right approach for an answer-writer is to say so, then explain how the dispute should be resolved: joint sampling, a Schedule III laboratory, the referee method and the retained samples.
What to watch next
- A joint re-test in Karnataka. The OMCs have asked for the counterpart samples and a test in the presence of both sides. Whatever it finds will be reported through the same Control Order channels.
- Vehicle compatibility. Standards for materials and calibration are published by BIS and the automotive industry; the debate is now about older vehicles. The same fuel debate links to the CAFE-III fuel-economy norms, which shape how carmakers tune engines for ethanol blends.
- Beyond E20. A move to higher blends would need more feedstock, vehicles built for it (flex-fuel vehicles) and further study. Brazil, often cited, has made E30 the mandatory blend for regular petrol since August 2025 (raised from E27), with a legal ceiling of 35%.
🔑 Revision block
The news. 7 November 2026: Petroleum Ministry says 893 E20 samples (IOCL 330, BPCL 280, HPCL 283) from 27 States/UTs met the 19-21% range; 56 Karnataka samples read 19-20% (average 19.30%). Karnataka had reported 26-31% at some outlets; OMCs question the sampling and method.
Sampling rules. Control Order 2005 (Essential Commodities Act, 1955) + MDG 2024: six one-litre samples = 2 dealer + 2 retained + 2 laboratory (Schedule III or gazetted). Petroleum products = Union List Entry 53.
Standard and methods. IS 17021:2018 (Amendment 3, Aug 2025, by BIS): FTIR (ASTM D5845), water extraction (Annex C), gas chromatography (ASTM D4815/D6839) with 1:1 dilution and E10 reference-material correction. Check: ethanol is denser than petrol.
Roadmap. Pilot 2001 → NPB 2018 (4 Jun 2018) → NITI roadmap (Jun 2021) → E10 in Jun 2022 → Cabinet amendment 18 May 2022: E20 target to ESY 2025-26 (Nov-Oct) → 1,134 crore litres blended vs 5,673 crore petrol (~20%).
Feedstock and benefits. 1G = cane juice, molasses, grain; 2G = residue (Panipat, 10 Aug 2022). Since ESY 2014-15: forex ₹1.97 lakh crore, crude 316 lakh tonnes, CO₂ 952 lakh tonnes, farmers ₹1.66 lakh crore.
🎯 Practice MCQs
Q1. According to the Petroleum Ministry, the ethanol content of the E20 samples tested by the OMCs and CHT fell within the range of:
(a) 9-11%
(b) 19-21%
(c) 26-31%
(d) 29-31%
→ (b)
All 893 samples were within 19-21%. The 26-31% figure is the claim made in the Karnataka press release.
Q2. Under the fuel-sampling procedure described in the release, the number of one-litre samples drawn at an outlet is:
(a) Two
(b) Three
(c) Four
(d) Six
→ (d)
Six samples are drawn: two to the dealer, two retained by the oil company or department, and two to a specified laboratory.
Q3. The Motor Spirit and High Speed Diesel (Regulation of Supply, Distribution and Prevention of Malpractices) Order, 2005 is issued under the:
(a) Essential Commodities Act, 1955
(b) Petroleum Act, 1934
(c) Bureau of Indian Standards Act, 2016
(d) Legal Metrology Act, 2009
→ (a)
The Control Order is a delegated law under the Essential Commodities Act. BIS sets the product specification (IS 17021) but does not issue the Order.
Q4. An Ethanol Supply Year (ESY) in India runs from:
(a) April to March
(b) January to December
(c) November to October
(d) July to June
→ (c)
ESY 2025-26 ended on 31 October 2026, so the year runs November to October.
Q5. The 2022 amendment to the National Policy on Biofuels advanced the 20% ethanol-blending target to:
(a) 2023
(b) 2024
(c) ESY 2025-26
(d) 2030
→ (c)
The Cabinet approved the change on 18 May 2022. The target had originally been set for 2030.
Q6. Consider the following statements:
1. Ethanol is denser than petrol, so a blend with more ethanol is expected to be somewhat denser.
2. Under IS 17021, a gas-chromatography result can be reported without dilution or reference-material correction.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
→ (a)
Statement 1 is correct. For statement 2, the standard requires a 1:1 dilution with oxygenate-free petrol and correction against an E10 certified reference material.
Q7. The 2G ethanol plant dedicated to the nation on 10 August 2022, meant to use paddy residue, is located at:
(a) Bargarh
(b) Numaligarh
(c) Mathura
(d) Panipat
→ (d)
The Panipat plant in Haryana was dedicated on World Biofuel Day 2022. Second-generation ethanol uses non-food biomass.
Q8. The Centre for High Technology (CHT), which monitors ethanol blending and fuel quality with the OMCs, functions under the Ministry of:
(a) Heavy Industries
(b) Petroleum and Natural Gas
(c) New and Renewable Energy
(d) Science and Technology
→ (b)
CHT works under the Ministry of Petroleum and Natural Gas and runs the quality coordination exercise with the OMCs.
📋 How this gets asked (PYQ pattern)
Biofuels and energy come up in the CDS economy and general-science sections in three shapes.
The first is basic identification: what E20 means, what ethanol is made from, which feedstock is first or second generation. Expect options that swap E10, E20 and E85, or put molasses and rice straw in the wrong generation.
The second is policy dates and targets: the National Policy on Biofuels (2018), its 2022 amendment, and the year E20 was due. Remember the direction, a target advanced from 2030 to 2025-26, and the one-line fact that E10 came in June 2022.
The third, and the freshest hook, is the institutional layer: who sets the standard (BIS), who regulates sampling (Control Order 2005) and who tests (OMC and CHT laboratories). A statement pair mixing up BIS and the Control Order is likelier than a question on the Karnataka dispute itself. For descriptive papers and interviews, practise a balanced paragraph: benefits (energy security, farm income, emissions), costs (higher ethanol price, older vehicles, food-versus-fuel) and the principle that disputes are settled by procedure.
Preparing for CDS? Make a one-page table of blends (E10, E20, E85, E100) with feedstocks and agencies, and revise the energy basics in our notes on economic geography of energy and agriculture and the economy. Follow the daily CDS current affairs, and learn with experienced faculty in the upcoming Cavalier courses in Delhi.
Source: PIB / Ministry of Petroleum & Natural Gas, "E20 Petrol Supplied by PSU Oil Marketing Companies Meets Prescribed Quality Standards; 893 Samples Across 27 States and UTs Found Compliant", 7 November 2026; PIB, "Cabinet approves Amendments to the National Policy on Biofuels - 2018", 18 May 2022; PIB, "India has achieved the target of 10 percent ethanol blending, 5 months ahead of schedule", 5 June 2022; PIB, "Response to concerns on 20% blending of ethanol in petrol and beyond", 12 August 2025; PIB, "PM dedicates 2G Ethanol Plant in Panipat", 10 August 2022. Claims on both sides are as reported in the Ministry's statement.
✍️ Written by Aditya Tiwari — Economy & current-affairs faculty at The Cavalier. Reviewed by the Cavalier Faculty Desk.