Coal and Petroleum Reserves in India Distribution, Production & Energy Security
India sits on over 400 billion tonnes of coal but imports nearly 89% of its crude oil. That contrast explains most of what UPSC asks about coal and petroleum reserves in India: where they are, how much we produce, and why the two fuels behave so differently.
Here's a question that trips up even serious aspirants: if India has the fifth-largest coal endowment in the world, why does it still import coal? And if Assam struck oil back in 1889, why does India buy almost nine of every ten barrels it refines?
The answers lie in the geography of coal and petroleum reserves in India. The location of these resources, their quality and their age shape everything from power prices to foreign policy. This guide gives you the latest numbers, the maps you need in your head, and the analysis that turns a Prelims fact into a Mains answer.
At Legacy IAS Academy, we teach this topic as one story. Coal is the fuel India has but struggles to use cleanly. Oil is the fuel India needs but does not have.
Why Coal and Petroleum Reserves in India Matter for UPSC
The topic sits at the junction of two papers. In GS1, it falls under distribution of key natural resources. In GS3, it connects to energy security, infrastructure and environment. Prelims tests locations and rankings. Mains tests your ability to link the two.
- Prelims: state rankings, coalfield–state matching, oilfield–basin matching, types of coal
- GS1 Mains: factors behind the location of mineral and energy resources
- GS3 Mains: import dependence, energy transition, coal gasification, strategic reserves
- Essay: energy security versus climate commitments
Coal Reserves in India: The Gondwana Story
According to the Geological Survey of India's national coal inventory, India's total geological coal resources stood at 4,00,715.45 million tonnes as on 1 April 2025, assessed to a depth of 1,200 metres. Of this, the Tertiary coalfields contribute only 1,694.65 MT, which means over 99% of Indian coal is Gondwana coal.
Gondwana vs Tertiary Coal
Gondwana coal formed roughly 250 million years ago in river valleys of the ancient Gondwana landmass. It is found along the Damodar, Mahanadi, Son, Godavari and Wardha valleys. It is mostly bituminous, with high ash content.
Tertiary coal is much younger, about 15–60 million years old. It occurs in Assam, Meghalaya, Arunachal Pradesh and Nagaland. It has low ash but high sulphur and moisture, which limits its industrial use.
The "resources" figure (400.72 BT) is not the same as "proved reserves." It includes Measured (proved), Indicated and Inferred categories. Measured resources are roughly 220 BT. When a question says "proved reserves," do not quote the 400 BT figure.
Types of Coal by Carbon Content
- Anthracite — highest carbon (80–95%), best quality; found in small quantity in Jammu & Kashmir.
- Bituminous — 60–80% carbon; the bulk of Indian coal; includes coking coal used in steel making.
- Lignite (brown coal) — 40–55% carbon, high moisture; Neyveli in Tamil Nadu is the main deposit.
- Peat — below 40% carbon; the first stage of coal formation.
State-wise Distribution of Coal Reserves in India
Here's the update many aspirants miss: Odisha has overtaken Jharkhand as the state with the largest coal resources. Older textbooks still put Jharkhand on top. The latest inventory does not.
| Rank | State | Coal Resources (MT, as on 01.04.2025) | Approx. Share | Key Coalfields |
|---|---|---|---|---|
| 1 | Odisha | 1,00,975.78 | 25.2% | Talcher, Ib Valley |
| 2 | Jharkhand | 93,254.06 | 23.3% | Jharia, Bokaro, North & South Karanpura, Giridih, Rajmahal |
| 3 | Chhattisgarh | 85,263.22 | 21.3% | Korba, Mand-Raigarh, Hasdeo-Arand |
| 4 | West Bengal | 34,386.09 | 8.6% | Raniganj, Birbhum |
| 5 | Madhya Pradesh | 33,563.62 | 8.4% | Singrauli, Sohagpur, Pench-Kanhan |
| 6 | Telangana | 23,288.62 | 5.8% | Godavari Valley (Singareni) |
| 7 | Maharashtra | 13,586.70 | 3.4% | Wardha Valley, Kamptee |
The top three states, Odisha, Jharkhand and Chhattisgarh, together hold nearly 70% of India's coal. That clustering in the eastern and central plateau explains why power plants, steel mills and rail freight corridors concentrate there.
Coalfields Worth Remembering
- Jharia (Jharkhand): India's main source of prime coking coal; also known for decades-old underground fires.
- Raniganj (West Bengal): the oldest coalfield in India, mining since 1774.
- Singrauli (MP–UP border): India's "energy capital," packed with pithead thermal power plants.
- Korba (Chhattisgarh): home to Gevra, among the largest opencast mines in Asia.
- Talcher (Odisha): large non-coking reserves; the site of India's coal gasification push.
Lignite Reserves
India's lignite resources are estimated at about 47,370.54 MT as on 01.04.2025. Tamil Nadu holds the largest share, followed by Rajasthan, Gujarat, Puducherry, Jammu & Kashmir and Kerala. Neyveli (Tamil Nadu), Barsingsar (Rajasthan) and Panandhro (Gujarat) are the key fields.
Coal Production in India: Crossing the Billion-Tonne Mark
In FY 2024-25, India produced 1,047.52 MT of coal, the first time the country crossed one billion tonnes. In FY 2025-26, provisional output came in at 1,040.83 MT, a marginal dip of about 0.6%. Weaker power demand and high pithead stocks kept the year flat.
| Producer | FY 2024-25 | FY 2025-26 | Trend |
|---|---|---|---|
| Coal India Ltd (CIL) | 781.1 MT | 768.1 MT | ▼ 1.7% |
| Captive & Commercial Mines | 190.95 MT | 210.46 MT | ▲ 10.2% |
| All India (Provisional) | 1,047.52 MT | 1,040.83 MT | ▼ 0.6% |
The real story is the shift in who mines India's coal. Captive and commercial mines crossed 200 MT for the first time in FY 2025-26, a jump of over 80% from FY 2022-23. Commercial coal block auctions, launched in 2020, are slowly loosening CIL's dominance.
Top Producing States
Odisha is now the largest coal-producing state (about 270 MT in FY 2024-25), followed by Chhattisgarh and Jharkhand (about 206 MT). Note the trap: Jharkhand ranks second in resources but not first in production.
"Reserves tell you where coal is. Production tells you where the railway lines, the clearances and the capital went. UPSC rewards the aspirant who can explain the gap between the two." — Legacy IAS Faculty
Petroleum Reserves in India: Distribution Across Basins
Petroleum is found in sedimentary rocks of the Tertiary age, mostly in anticlines and fault traps. India's oil therefore lies in the young sedimentary basins, not on the old peninsular plateau where the coal is. That single geological fact explains why the coal map and the oil map of India barely overlap.
India's proved crude oil reserves stood at about 672 MT (2025, provisional), down from about 763 MT in 2014. Under the Petroleum Resources Management System, the Estimated Ultimate Recovery is about 1,948 MMT of crude oil.
| Region / Basin | Major Oilfields | Notes |
|---|---|---|
| Western Offshore (Mumbai) | Mumbai High, Neelam, Heera, Bassein (gas) | Largest share of national reserves (~37–38%); Mumbai High discovered 1974 |
| Assam (Assam–Arakan Basin) | Digboi, Naharkatiya, Moran, Lakwa, Rudrasagar | Digboi (1889) is India's oldest oilfield; largest onshore reserves |
| Gujarat (Cambay Basin) | Ankleshwar, Kalol, Mehsana, Gandhar, Nawagam | Ankleshwar was the first major post-Independence find |
| Rajasthan (Barmer Basin) | Mangala, Bhagyam, Aishwariya, Baghewala | Largest onshore discovery in decades; major onshore producer |
| Krishna–Godavari Basin | KG-D6, KG-DWN-98/2 | Mainly gas, with growing deepwater oil |
| Cauvery Basin (Tamil Nadu) | Narimanam, Kovilkalappal | Small onshore and offshore reserves |
Petroleum Production in India: An 11-Year Decline
Domestic crude production stood at 27.96 MT in FY 2025-26, down from 28.70 MT in FY 2024-25 and 29.36 MT in FY 2023-24. It is the eleventh straight year of decline. Meanwhile, crude import dependence reached a record 88.7%.
Why Production Keeps Falling
- Ageing fields: Mumbai High and the Assam fields are decades past their plateau phase.
- Long gestation: discoveries take years to reach production.
- Limited exploration: large parts of India's sedimentary basins remain under-explored.
- Weak private interest: most licensing rounds have been dominated by public-sector firms.
Policy Response
- Strategic Petroleum Reserves (SPR): 5.33 MMT capacity at Visakhapatnam, Mangaluru and Padur. Phase II adds 6.5 MMT at Chandikhol (Odisha) and Padur (Karnataka).
- Samudra Manthan: an ₹84,084-crore scheme for offshore and deepwater exploration, aiming to raise domestic oil and gas output from about 62 to 80 MMTOE.
- OALP and HELP: open acreage licensing replacing the older NELP regime.
- Refining strength: India's refining capacity of about 258 MMTPA makes it the fourth-largest refiner globally, and a net exporter of petroleum products.
Coal vs Petroleum: The UPSC Comparison
- Gondwana age, peninsular plateau
- Abundant: 400+ BT resources
- ~1 BT annual production
- Imports mainly for coking coal and blending
- Challenge: pollution, ash content, land and forest conflicts
- Tertiary sedimentary basins, offshore and northeast
- Scarce: ~672 MT proved reserves
- ~28 MT annual production, falling
- Nearly 89% import dependence
- Challenge: geopolitical supply shocks, forex outgo
Common Prelims Traps
- Largest coal resources: Odisha, not Jharkhand (as per the 01.04.2025 inventory).
- Largest lignite resources: Tamil Nadu.
- Oldest coalfield: Raniganj. Oldest oilfield: Digboi.
- Prime coking coal: Jharia.
- Tertiary coal is low-ash, high-sulphur; Gondwana coal is high-ash.
Practice Mains Question
Q. "India is coal-rich but oil-poor." Examine the geological reasons behind this asymmetry and its implications for India's energy security. (15 marks, 250 words)
Want structured answer-writing practice on questions like this? Explore the Legacy IAS UPSC programmes for GS Geography and GS3 economy coverage.
FAQs on Coal and Petroleum Reserves in India
Which state has the largest coal reserves in India?
Odisha, with about 1,00,975.78 MT as on 1 April 2025, followed by Jharkhand and Chhattisgarh. Together, these three hold nearly 70% of India's coal resources.
Which state is the largest producer of coal in India?
Odisha, which produced about 270 MT in FY 2024-25. Chhattisgarh and Jharkhand follow.
Where are India's largest petroleum reserves?
The Western Offshore basin, which includes Mumbai High, holds the largest share. Among onshore states, Assam and Gujarat lead, with Rajasthan's Barmer basin a major producer.
Why is India's crude oil production declining?
Mainly because of ageing fields like Mumbai High and the Assam fields, long gestation periods for new discoveries, and limited exploration of sedimentary basins.
Key Takeaways
- Update your notes: Odisha now leads in both coal resources and coal production.
- Remember the split: over 99% of Indian coal is Gondwana, while oil lies in Tertiary sedimentary basins.
- Quote the right numbers: 400.72 BT coal resources, ~1,041 MT coal output (FY26), 27.96 MT crude output (FY26).
- Use 88.7% crude import dependence as your anchor statistic in any GS3 energy-security answer.
- Link policies to problems: commercial coal mining for output, SPRs and Samudra Manthan for oil security.
- Practise map-based revision: coalfields along river valleys, oilfields along basins and offshore.
Ready to begin? Legacy IAS offers both Classroom and Online batches across Bengaluru and pan-India.
