How IOC, BPCL, and HPCL Manage E20 Distribution Across 80,000 Pumps

Three companies control virtually all of India’s petrol distribution: Indian Oil Corporation (IOC), Bharat Petroleum (BPCL), and Hindustan Petroleum (HPCL). They are the ones who blend ethanol into petrol and deliver E20 to over 80,000 fuel stations. This article explains how E20 reaches your tank, and what happens along the way.

The oil marketing companies

India’s fuel distribution is dominated by three government-owned Oil Marketing Companies (OMCs):

The OMCs procure crude oil, refine it, blend ethanol into the petrol stream, and distribute the finished product to retail outlets. They are also the entities that procure ethanol from distilleries under government-set prices. Together, the three public-sector OMCs control approximately 87 percent of India’s retail fuel market, which means their blending decisions affect nearly every vehicle owner in the country.

How ethanol blending works at scale

Ethanol procurement

OMCs procure ethanol through a tendering process. The government sets the procurement price for each feedstock category (C-heavy molasses, B-heavy molasses, sugarcane juice, maize, damaged food grains). Distilleries bid to supply ethanol, and OMCs are mandated to purchase it at the fixed prices.

In Ethanol Supply Year (ESY) 2024–25, OMCs contracted approximately 700 crore litres of ethanol. The supply comes from over 350 distilleries across India, concentrated in Uttar Pradesh, Maharashtra, Karnataka, and increasingly in Bihar, Madhya Pradesh, and Haryana (maize-based). These contracts are awarded annually, and the procurement prices are revised each year by the Cabinet Committee on Economic Affairs (CCEA). For ESY 2024–25, the prices ranged from approximately ₹56.28/litre for C-heavy molasses-based ethanol to ₹71.86/litre for sugarcane juice-based ethanol, with grain-based ethanol priced at approximately ₹65.61/litre.

The depot blending process in detail

Ethanol is blended into petrol at OMC depots and terminals, not at individual fuel stations. Understanding what happens at a depot is important because it determines the consistency and quality of the fuel that eventually reaches consumers. Here is the step-by-step process:

1. Base petrol receipt: Base petrol (typically 85–88 RON before additives) arrives at the depot from refineries via pipeline, rail, or road tanker. It is stored in large above-ground tanks, each with a capacity of 500–5,000 kilolitres depending on the depot size.
2. Ethanol receipt and testing: Ethanol arrives from contracted distilleries, typically by road tanker. Each incoming ethanol tanker is sampled and tested for purity, water content, and contaminants before being accepted. Ethanol must meet IS 15464 specifications, with a minimum purity of 99.5 percent (anhydrous grade). If a tanker fails quality testing, it is rejected and returned to the distillery.
3. Ethanol storage: Accepted ethanol is transferred to dedicated ethanol storage tanks at the depot. These tanks are constructed with ethanol-compatible materials (typically stainless steel or specially coated carbon steel) and are equipped with nitrogen blanketing systems to prevent moisture ingress. Ethanol is hygroscopic — it readily absorbs water from the atmosphere — so storage integrity is critical.
4. In-line blending: Most OMC depots use automated in-line blending systems. As base petrol is pumped from its storage tank towards the loading gantry, ethanol is injected into the petrol stream through a metered injection point. Flow meters on both the petrol and ethanol lines ensure the correct volumetric ratio (80:20 for E20). A static mixer downstream of the injection point ensures thorough mixing of the two liquids.
5. Quality verification: After blending, the E20 mixture passes through an online analyser that checks ethanol content, density, and other parameters. The blended fuel must conform to IS 2796:2017 specifications before being cleared for loading into tanker trucks.
6. Loading into tanker trucks: The blended E20 is loaded into tanker trucks at the depot’s loading gantry. Each tanker compartment is sealed, and the volume is electronically recorded.

How blending ratios are maintained

Maintaining an exact 20 percent ethanol ratio across millions of litres is a significant engineering challenge. The in-line blending systems have a tolerance band, typically plus or minus 1–2 percentage points. This means fuel labelled as “E20” might actually contain 18–22 percent ethanol in any given batch.

Several factors can cause the ratio to deviate:

• Flow-rate fluctuations: If the ethanol pump or petrol pump speed varies, the ratio drifts until the control system corrects it.
• Start-up and shut-down: At the beginning and end of a blending run, the ratio may be outside spec until steady-state flow is achieved.
• Ethanol supply shortfalls: If a depot runs low on ethanol, the control system may reduce the blending percentage rather than halt petrol dispatch entirely.
• Seasonal variation: During the sugarcane crushing season (October–March), ethanol supply is more plentiful. In the off-season, supply can tighten, leading to lower blending ratios at some depots.

The consumer has no way to know where on this range their tank-fill falls. The pump display does not show ethanol percentage, and OMCs do not publish batch-level blending data.

Delivery to stations: the tanker logistics

Tanker trucks deliver the pre-blended E20 to fuel stations. This last-mile delivery is a massive logistical operation in itself:

• Fleet size: The three public-sector OMCs collectively operate or contract over 30,000 tanker trucks for fuel delivery across India.
• Trip frequency: A busy urban fuel station may receive 2–4 tanker loads per day (each tanker carrying 12,000–16,000 litres). A rural station may receive one load every 2–3 days.
• Transit time: Depots serve stations within a radius of 50–300 km. Longer distances increase the risk of temperature changes and moisture ingress during transit.
• Tanker compartment integrity: Tankers that previously carried pure petrol are now carrying E20. Internal coatings and seals in older tankers may not be fully ethanol-compatible, creating a potential contamination pathway.

The station receives the fuel into underground storage tanks and dispenses it to customers. Fuel station operators do not perform any blending themselves — the fuel arrives ready to dispense.

Quality control challenges

The blending and distribution system faces several practical challenges:

• Blend ratio accuracy: The target is 20 percent ethanol, but the actual blend at any given station depends on the depot’s blending accuracy and the ethanol supply available. During supply shortages, some batches may have less than 20 percent ethanol; during surplus, the blend is more consistent.
• Moisture contamination: Ethanol is hygroscopic. During transport and storage, the fuel can absorb moisture from the atmosphere, particularly during monsoon. Depot storage tanks, tanker trucks, and station underground tanks are all potential moisture-ingress points. Once water content exceeds approximately 0.5 percent, phase separation can occur — the ethanol-water mixture separates from the petrol, forming a corrosive layer at the bottom of the tank.
• Regional variation: Ethanol supply is not uniform across India. Sugarcane-belt states (UP, Maharashtra, Karnataka) have more ethanol availability than states without major distilleries. In supply-deficit regions, actual blending percentages may be lower.
• No consumer verification: There is no mechanism for a consumer at the pump to verify the ethanol content of the fuel being dispensed. The pump display shows volume and price, not fuel composition.
• Underground tank condition: Fuel station underground tanks were originally installed for pure petrol or low-ethanol blends. Ethanol can degrade the internal coatings of these tanks over time, leading to rust particles and sediment entering the fuel. Some stations have upgraded their tanks; many have not.

What happens when ethanol supply falls short

Ethanol supply is not guaranteed year-round. When a depot does not have enough ethanol to maintain the 20 percent blend, several things can happen:

• The depot reduces the blending ratio — dispatching E15, E12, or even lower blends while labelling the fuel as the same product. The consumer does not know.
• The depot prioritises ethanol supply to high-volume stations and reduces supply to lower-volume ones.
• In extreme shortage situations (rare but documented during inter-seasonal periods), a depot may dispatch near-E0 petrol for a few batches until ethanol supply resumes.

This inconsistency is problematic for vehicle owners because engines behave differently on E20 versus E10 versus E5. A vehicle’s ECU (on fuel-injected models) adjusts to the fuel it receives. Frequent changes in ethanol percentage force the ECU to continuously re-adapt, which can cause inconsistent performance and fuel economy.

Storage challenges for ethanol-blended fuel

Storing E20 is more demanding than storing pure petrol, at every point in the supply chain:

• Material compatibility: Ethanol is a solvent. It attacks certain rubbers, plastics, and coatings that are stable in contact with petrol. Storage tanks, gaskets, valve seals, and hose linings throughout the supply chain must be upgraded to ethanol-resistant materials (typically Viton, PTFE, or stainless steel).
• Shelf life: E20 has a shorter effective shelf life than pure petrol. If blended fuel sits in a tank for extended periods (more than 30–45 days), especially in humid conditions, the risk of phase separation increases. This is particularly relevant at low-throughput rural stations.
• Temperature sensitivity: Ethanol’s vapour pressure characteristics differ from petrol. In hot weather (common across most of India for most of the year), E20 has higher evaporative emissions, requiring better-sealed storage and dispensing equipment.
• Water drainage: Underground storage tanks at fuel stations need regular water draining when storing E20. Water that would simply sit at the bottom of a pure-petrol tank gets absorbed into the ethanol fraction of E20. If water accumulates beyond the ethanol’s absorption capacity, the entire batch can degrade.

The economics for OMCs

The OMCs are both implementers and beneficiaries of the blending programme. Understanding their economics helps explain why E20 is priced the way it is:

Procurement costs and margins

• Ethanol procurement cost: Ethanol is procured at ₹56–72/litre depending on feedstock. At current crude oil prices, this is comparable to or slightly higher than the petrol it replaces, depending on refining margins.
• Refining cost of petrol: The cost of refining crude oil into petrol (the “refining margin”) varies with global crude prices but typically falls in the range of ₹4–8/litre. When crude oil prices are high, ethanol becomes relatively cheaper; when crude prices drop, ethanol is the more expensive component.
• Blending infrastructure cost: OMCs have collectively invested thousands of crores in depot-level blending equipment, ethanol storage tanks, pipeline modifications, and tanker upgrades. IOC alone has reported spending over ₹2,000 crore on E20 infrastructure. These capital costs are amortised over 15–20 years and factored into the OMCs’ overall operating costs.

Retail pricing: the consumer disconnect

E20 is sold at the same pump price as the petrol it replaced. The OMCs do not offer a discount for the lower energy content. The consumer pays the same price per litre for fuel that delivers ~6–7 percent fewer kilometres. Effectively, the consumer’s cost per kilometre has risen by ~6–7 percent without any line-item increase in the pump price.

In countries like the United States and Brazil, ethanol-blended fuel (E10 or E85) is typically priced lower than pure petrol, reflecting its lower energy content. India’s approach of pricing E20 the same as E0 means the consumer absorbs the energy-content penalty without any price offset. The government’s position is that the foreign exchange savings from reduced crude oil imports benefit the economy as a whole, but this macro benefit does not translate into a tangible benefit at the pump.

Who profits from the blending programme

The ethanol blending programme creates a guaranteed domestic market for ethanol producers. Distilleries receive government-fixed prices and guaranteed offtake from OMCs. Sugar mills that have invested in ethanol distillation capacity have a new revenue stream that reduces their dependence on volatile sugar prices. For OMCs, the blending programme reduces their crude oil procurement costs when crude prices are high, but this saving is not passed on to the retail consumer.

What happens at the pump

From the consumer’s perspective, the fuel station experience has not changed. You ask for “petrol” and get E20. There is no option to choose a different blend. The pump nozzle is the same. The price display works the same way. What changed is invisible: the fuel in the underground tank has 20 percent ethanol instead of 10 percent (or less, before blending ramped up).

Some stations display a small sticker indicating E20 or “E-20 Ethanol Blended Petrol.” Labelling requirements are minimal compared to international standards. See our article on labelling and transparency for a detailed comparison.

Can you get E0 or E10?

As of July 2026, no. The nationwide mandate means all petrol distributed through OMC channels is E20. There is no separate E0 or E10 product at any retail fuel station in India. This is unlike countries such as the United States, Brazil, or several European nations where consumers can choose between different ethanol blends. In the US, for example, many stations offer E0 (“recreational fuel”), E10 (regular), and E85 (flex-fuel) side by side. In Brazil, consumers choose between “gasolina comum” (E27) and ethanol (E100). India offers no such choice.

Private-sector retailers like Reliance-BP, Nayara Energy, and Shell also distribute E20. They follow the same BIS specifications and blending mandates as the public-sector OMCs. No retailer in India currently offers an E0 alternative.

The E20 supply chain is a massive logistical operation involving hundreds of distilleries, dozens of depots, thousands of tanker trucks, and over 80,000 fuel stations. It works — the fuel gets to the pump. But the consumer has no visibility into the blend ratio, no choice of fuel grade, and no way to verify what they are buying. The blend can vary by depot, by season, and by ethanol supply conditions — and the consumer is never told. The infrastructure delivers E20 efficiently; whether it delivers transparency, consistency, or consumer value is a different question.