Discover everything about oil refineries in India – history, refining process, public & private players, total capacity, and the world’s largest refinery.
Oil refineries form the backbone of India’s energy sector. They transform raw crude oil into everyday fuels and products that keep the country moving — from the petrol in your car to the LPG in your kitchen. With a mix of history, scale, and global importance, India’s refining industry is both fascinating and vital. Let’s explore how it works and what makes it unique.
Understanding the role of refineries in India’s energy sector
An oil refinery is essentially a giant conversion plant. It takes crude oil — a thick, dark liquid pulled from beneath the earth — and breaks it down into usable products like petrol, diesel, kerosene, aviation turbine fuel, and even lubricants. Think of it as a “filtering house” that transforms raw material into multiple forms of energy and products we depend on daily.
2. What is Crude Oil?
The raw material that powers refineries
Crude oil is a naturally occurring fossil fuel made up of hydrocarbons, sulfur, nitrogen, oxygen, and traces of metals. Crude oil is often called “black gold”. It is extracted from underground reservoirs and serves as the primary raw material for producing fuels like petrol, diesel, LPG, aviation fuel, and petrochemicals used in plastics, fertilizers, and more. On its own, crude has limited use. It is only after refining that it becomes the fuel that powers cars, airplanes, industries, and homes.
3. Types of Crude Oil
Once crude oil is extracted, it can vary widely in physical properties, composition, and quality. Understanding these types is crucial because they determine refining processes and the kinds of products that can be obtained.
Light Crude Oil
Contains a higher proportion of light hydrocarbons (like gasoline and naphtha).
Flows easily and has lower viscosity.
Easier and cheaper to refine.
Example: Brent Crude (North Sea), West Texas Intermediate (WTI).
Medium Crude Oil
Balanced composition of light and heavy hydrocarbons.
Requires moderate refining effort.
Example: Bonny Light (Nigeria).
Heavy Crude Oil
Contains more long-chain hydrocarbons; higher viscosity and density.
Harder to pump and refine; yields more residual fuel oils.
Example: Maya (Mexico), Western Canadian Select (Canada).
Extra Heavy Crude Oil / Bitumen
Extremely dense and viscous; often needs heating or dilution for transport.
Mainly used for producing asphalt, heavy fuels, or synthetic crude after upgrading.
Example: Orinoco Belt (Venezuela), Athabasca Oil Sands (Canada).
Sweet vs. Sour Crude
Sweet Crude: Low sulfur content (<0.5% sulfur). Easier to refine and produces cleaner fuels.
Sour Crude: High sulfur content (>0.5% sulfur). Requires additional desulfurisation during refining to meet environmental standards
4. The Process of Oil Refining and Distillation
How crude oil is transformed into usable products
The heart of refining lies in fractional distillation:
- Crude oil is first heated in a furnace.
- As it vaporizes, it enters a tall column where temperatures vary from bottom to top.
- Different components condense at different levels — lighter products like LPG and petrol rise to the top, while heavier ones like diesel, lubricants, and bitumen settle at lower levels.
This is just the first step. Advanced processes such as cracking, reforming, and blending further refine the fractions to improve quality and efficiency.
5. How Many Oil Refineries are in India?
Total number of refineries across sectors
India currently operates 23 oil refineries. Of these, 18 are in the public sector, 3 in the private sector, and 2 are in the joint sector. Together, they make India a refining powerhouse in Asia.
6. The Oldest Oil Refinery in India
Digboi Refinery – India’s first step in refining history
India’s oil refining story began in 1901 with the Digboi Refinery in Assam. Often called the “Oil City of Assam,” Digboi is not only India’s first refinery but also one of the oldest operating refineries in the world.
7. Major government-owned companies and their contribution
The public sector dominates refining in India, driven by major state-run giants such as:
- Indian Oil Corporation Limited (IOCL)
- Bharat Petroleum Corporation Limited (BPCL)
- Hindustan Petroleum Corporation Limited (HPCL)
- ONGC (via Mangalore Refinery and Petrochemicals Limited)
These companies account for the majority of refining capacity and ensure energy security across the nation.
8. Oil Refineries in the Private Sector
How private players like Reliance and Nayara changed the game
Private companies also play a major role, especially in terms of scale:
- Reliance Industries Limited (RIL) – Runs the Jamnagar refinery complex, the largest in the world.
- Nayara Energy – Operates a major refinery at Vadinar, Gujarat.
These players have placed India on the global refining map with massive export capacities.
9. Oil Refineries in the Joint Sector
Collaboration between public and private entities
Joint sector refineries emerged as collaborations between government entities and private or foreign partners. Examples include:
- Numaligarh Refinery Limited (NRL) in Assam.
- MRPL (Mangalore Refinery and Petrochemicals Limited), which began as a joint venture and later became an ONGC subsidiary
10. Refinery-wise Capacity in India
A breakdown of refining capacities across companies
Refining capacity varies widely across facilities:
- Reliance Jamnagar Complex – ~68 million metric tonnes per annum (MMTPA)
- Nayara Energy, Vadinar – ~20 MMTPA
- IOCL Refineries (Panipat, Mathura, Paradip, Haldia, Barauni, etc.) – Combined ~70+ MMTPA
- BPCL Refineries (Mumbai, Kochi, Bina) – ~35 MMTPA
- HPCL Refineries (Mumbai, Visakhapatnam) – ~20 MMTPA
- Other refineries (MRPL, CPCL, NRL, etc.) – Significant regional contributors.
11. India’s Total Refining Capacity
Where India stands globally in oil refining
Together, India’s refineries boast a capacity of around 254 MMTPA. This makes India the second-largest refiner in Asia (after China) and the fourth-largest globally.
12. The Largest Oil Refinery in India
Jamnagar Refinery – India’s crown jewel and global leader
The crown jewel of India’s refining industry is the Reliance Jamnagar Refinery Complex in Gujarat. With a capacity of 68 MMTPA, it holds the title of the largest refinery in the world, producing fuels not only for domestic use but also for export markets across Asia, Africa, and Europe.
13. Conclusion India’s Refining Future
Growth, energy security, and global importance
From the historic Digboi refinery in Assam to the world-class Jamnagar complex, India’s refining journey tells a story of growth, ambition, and global relevance. With 23 refineries and a capacity that rivals the biggest in the world, India is not just meeting its energy needs but also strengthening its position as a global refining hub. As demand for clean and efficient fuels rises, India’s oil refining industry will remain a cornerstone of the country’s energy security and economic growth.
