BharatNotes Why this chapter matters for UPSC: Fossil fuels — coal, petroleum, and natural gas — sit at the intersection of India's energy security, climate commitments, and developmental needs. GS3 questions on energy transition, India's coal sector, petroleum import dependence, alternative fuels, and carbon emissions are directly rooted in this foundational chapter.
PART 1 — Quick Reference Tables
Coal Types by Carbon Content
| Type | Carbon Content | Energy Value | Characteristics |
|---|---|---|---|
| Peat | ~60% | Lowest | Partially decomposed; first stage |
| Lignite | ~60–70% | Low | Brown coal; high moisture; India: Tamil Nadu (Neyveli) |
| Bituminous | ~70–86% | Moderate–High | Most abundant in India; used for power + coking |
| Anthracite | >86% | Highest | Hard, lustrous; rare in India; cleanest coal |
Petroleum Refinery Products (Fractional Distillation)
| Fraction | Boiling Range | Primary Use |
|---|---|---|
| LPG (Liquefied Petroleum Gas) | Below 30°C | Cooking fuel; auto fuel |
| Petrol (Gasoline) | 30–200°C | Motor vehicles |
| Kerosene | 150–275°C | Aviation fuel (ATF); rural cooking; lamps |
| Diesel | 200–350°C | Trucks, buses, trains, power generators |
| Lubricating oil | 300–400°C | Engine lubrication |
| Fuel oil | >400°C | Ships; industrial furnaces |
| Bitumen (Tar) | Residue | Road construction; waterproofing |
India's Key Energy Statistics
| Indicator | Data | Source/Year |
|---|---|---|
| Coal reserves | ~389 billion tonnes (389.42 BT as of 1 April 2024; CMPDI National Coal Inventory 2024) | 4th largest globally; Gondwana coal = 99.57% of reserves |
| Coal production | 1,047.67 million tonnes | FY2024-25 (first time crossing 1 billion tonnes; India 2nd largest producer globally) |
| Coal imports | ~268 million tonnes | FY2023-24 |
| Petroleum import dependence | ~87% | MoPNG, 2023-24 |
| India's refining capacity | ~254 million tonnes/year | 2nd largest in Asia after China |
| Ethanol blending in petrol | ~19.2% average; 20% in October 2025 | ESY 2024-25 (Nov 2024-Oct 2025); E20 target effectively achieved a year early |
PART 2 — Detailed Notes
Fossil Fuels — Formation
Fossil fuels are energy-rich substances formed from the remains of ancient organisms over millions of years under high heat and pressure. They contain solar energy stored in organic molecules. Because they take millions of years to form, they are classified as non-renewable resources.
- Coal: From ancient land plants/forests buried under sediment → heat + pressure → carbonisation over 250–300 million years (Gondwana/Permian period; India's coal is predominantly Gondwana-origin, ~250–300 Ma; European coal is older Carboniferous ~300–360 Ma)
- Petroleum/Crude oil: From marine microorganisms (plankton, algae) in ocean floors → buried in sedimentary rock basins → heat + pressure → petroleum + natural gas
Coal — Formation, Types and Uses
Coal formation stages (coalification): Dead vegetation → Peat → Lignite → Bituminous → Anthracite
Uses of coal and its products:
- Direct combustion: Thermal power plants generate ~50% of India's electricity from coal
- Coking coal: Converted to coke (nearly pure carbon) for steel manufacturing in blast furnaces; Jharia (Jharkhand) has India's best coking coal reserves
- Coal tar: By-product of coke production; source of benzene, naphthalene, anthracene, phenol — raw materials for dyes, explosives, medicines, roads, plastics
- Coal gas: Historically used for street lighting in 19th century; now mainly as by-product in coke ovens
UPSC GS3 — India's Coal Sector: Coal India Limited (CIL): State-owned enterprise; world's largest coal mining company by production. Produces ~80% of India's domestic coal. Major coalfields: Jharia (Jharkhand — best coking coal, also famous for underground mine fires burning since 1916), Raniganj (West Bengal — India's oldest coalfield), Singrauli (MP-UP border), Korba (Chhattisgarh), Talcher (Odisha).
Commercial coal mining: Opened to private sector in 2020 (Mines and Minerals Act amendment) — previously only CIL could commercially mine coal.
Clean coal technologies:
- Coal gasification (converting coal to syngas — H₂ + CO — for fertilizer/fuel)
- Coal liquefaction (converting coal to liquid fuels)
- Ultra-supercritical (USC) and advanced ultra-supercritical (AUSC) power plants — operate at higher temperatures/pressures for greater efficiency (~46%) and lower CO₂ per unit electricity
- Flue Gas Desulphurisation (FGD): Mandatory for coal power plants to reduce SO₂ emissions (MOEFCC notification 2015, deadline extended multiple times)
Petroleum — Formation, Refining and India's Reserves
Crude oil is found trapped in sedimentary rock formations (anticlines, fault traps) beneath impermeable rock layers — often alongside natural gas.
India's petroleum landscape:
- Mumbai High (Bombay High): Offshore field in the Arabian Sea — India's largest oil producer; operated by ONGC since 1976
- Digboi (Assam): India's oldest oil refinery (1901); still operational
- KG Basin (Krishna-Godavari): Significant gas and some oil; KG-D6 block by Reliance was a major 2002 discovery (large natural gas field); production declined substantially by 2012–14, now recovering
- ONGC (Oil and Natural Gas Corporation): Largest state-owned oil company; produces ~60% of India's domestic crude
UPSC GS3 — Reducing Petroleum Import Dependence:
India spends ~₹12–14 lakh crore annually on crude oil imports — the single largest import item. Key strategies to reduce dependence:
Ethanol Blending Programme (EBP): India achieved ~19.2% average blending in petrol in ESY 2024-25 (Ethanol Supply Year: November 2024 to October 2025), touching 20% in October 2025 -- effectively meeting the E20 target a year ahead of the ESY 2025-26 deadline. Total ethanol blended in ESY 2024-25: ~1,022 crore litres (PIB / ChiniMandi). Ethanol sourced from sugarcane (molasses, juice), maize, damaged foodgrains. Benefits: reduces import bill, reduces vehicular emissions, provides income to farmers.
Compressed Biogas (CBG): SATAT scheme (Sustainable Alternative Towards Affordable Transportation) — targets 15 million tonnes/year of CBG from biomass waste (agricultural residue, cattle dung, urban waste) by 2023 (delayed; ongoing).
Electric Vehicles (EVs): FAME-II ended March 2024; bridged by EMPS (April–Sep 2024). [Additional] PM e-DRIVE (PM Electric Drive Revolution in Innovative Vehicle Enhancement) launched October 2024; outlay ₹10,900 crore; extended to March 2028. Covers: 24.79 lakh e-two-wheelers, 3.2 lakh e-three-wheelers, 14,028 e-buses (9 cities). National EV Mission targets 30% EV sales by 2030 (EV30@30). Production Linked Incentive (PLI) for advanced battery manufacturing (₹18,100 crore).
Strategic Petroleum Reserves (SPR): India maintains underground SPR at Visakhapatnam, Mangalore, and Padur — total ~5.33 million tonnes (≈9.5 days of consumption) — to buffer against supply disruptions.
Natural Gas — India's Gas Sector
Natural gas is found with petroleum or in independent gas fields; primarily methane (CH₄); burns more cleanly than coal or oil (lower CO₂ per unit energy; very low sulphur/particulate emissions).
Uses:
- PNG (Piped Natural Gas): For household cooking; 14+ million PNG connections in India
- CNG (Compressed Natural Gas): For auto-rickshaws, taxis, buses — significantly less polluting than petrol/diesel (Delhi's famous CNG transition for public transport, 2001–2002, under Supreme Court orders)
- Power generation: Gas-based power plants (peaking capacity)
- Fertilizer feedstock: Natural gas → ammonia → urea (most Indian urea plants use natural gas or naphtha)
- LNG (Liquefied Natural Gas): Imported in cryogenic tankers; India imports from Qatar (Rasgas), USA, Australia, UAE
UPSC GS3 — Fossil Fuels and Climate Change: Burning fossil fuels releases CO₂ — the primary greenhouse gas driving anthropogenic climate change. Fossil fuels account for ~80% of global energy supply and ~75% of global CO₂ emissions.
India's energy dilemma:
- India has committed to 500 GW of non-fossil electricity capacity by 2030 (NDC) and net zero by 2070 (COP26 pledge)
- Yet coal remains essential during the transition — India's coal consumption is rising even as renewables grow
- Coal transition: G7 and IEA pressure India to phase out coal; India's position is "phase-down" not "phase-out" (COP26 Glasgow compromise language)
- Energy justice: ~700 million Indians still depend heavily on biomass/coal for cooking and heating; abrupt fossil fuel phase-out has equity implications
"Just Transition": Ensuring workers and communities dependent on coal mining are not left behind — retraining, social protection, economic diversification. Jharkhand, Chhattisgarh, Odisha coal belt regions are key concerns.
[Additional] 3a. Coalbed Methane (CBM) — India's Untapped Unconventional Gas Resource
The chapter covers conventional natural gas (from petroleum fields) but completely misses Coalbed Methane — a strategic unconventional gas resource found within India's own coal seams, directly relevant to India's energy security and gas-based economy push.
What is Coalbed Methane (CBM)? CBM is natural gas — predominantly methane (CH4) — naturally trapped within coal seams, adsorbed on the internal surfaces of coal. It is the same gas that causes dangerous explosions in underground coal mines (known as "firedamp"). Unlike conventional natural gas found in sandstone/limestone reservoirs, CBM is locked inside the coal matrix itself.
How CBM is extracted:
- Wells are drilled into coal seams
- Water saturating the coal seams is pumped out (dewatering) — this reduces reservoir pressure
- As pressure drops, methane desorbs from coal surfaces and flows into the wellbore
- Methane is piped to the surface for use
Why it is different from conventional natural gas:
- CBM does not need a separate impermeable "cap rock" trap — the coal itself is both the source rock and the reservoir
- Coal has a very high surface area (micropores) — can store 6-7x more gas per unit volume than conventional reservoirs
- CBM extraction simultaneously reduces mine explosion risk — in underground mining areas, CBM wells can be drilled ahead of mining to "degasify" the seam safely
[Additional] India's CBM Sector — GS3 (Energy Security / Unconventional Hydrocarbons):
India's CBM Resource Base (Directorate General of Hydrocarbons / DGH):
- Total prognosticated CBM resource: ~92 TCF (trillion cubic feet) = ~2,600 BCM across 12 states
- Among the world's largest untapped CBM resource bases
- Key states: West Bengal (Raniganj basin), Jharkhand (Jharia, Bokaro, North Karanpura), Madhya Pradesh (Sohagpur), Chhattisgarh, Rajasthan
- 6 CBM licensing rounds completed; ~40 blocks awarded covering ~21,177 sq. km.
Current production:
- Major producers: Essar Oil & Gas (EOGEPL) at Raniganj East (largest), GEECL (Great Eastern Energy) at Raniganj South, Reliance Industries in MP (Sohagpur blocks)
- ONGC holds Jharia, North Karanpura, Bokaro blocks (~85, 62, 45 BCM each)
- Combined private-sector production: ~2+ MMcmd (million metric standard cubic metres per day)
- Bokaro and North Karanpura fields commenced commercial production in 2024
Strategic importance:
- NITI Aayog estimates that unlocking even 20% of India's CBM resource could replace ~15% of LNG imports by 2030
- India imports ~46% of its gas as LNG (expensive); CBM can substitute imported gas with domestic production
- CBM is a bridge fuel: lower carbon emissions than coal combustion; same molecule (methane) as conventional natural gas; can directly enter the existing gas grid
[Additional] 3b. India's Natural Gas Gap — The 15% Target vs 6.3% Reality
The chapter mentions natural gas uses (CNG, PNG, fertilizer) but does not address India's ambitious gas-based economy policy push or the massive gap between current gas use and the government target.
[Additional] Natural Gas in India's Energy Mix — GS3 (Energy Policy / Climate):
Current reality:
- Natural gas currently accounts for only ~6.3-6.7% of India's total primary energy mix (PIB/MoPNG, 2024)
- India consumes ~185 MMSCMD (million metric standard cubic metres per day) of gas
- ~46% of gas supply is imported LNG (~85-86 MMSCMD); rest is domestic production (~99-100 MMSCMD)
Government target:
- India aims to raise natural gas to 15% of the primary energy mix by 2030 -- more than double the current share
- This target was formally announced by the government; a major infrastructure push is underway to meet it
Why gas matters:
- Natural gas emits ~50% less CO2 per unit electricity than coal; negligible SO2/particulates
- Gas can backup variable renewable energy (when solar/wind is unavailable)
- Gas-based fertilizer plants (urea) are more efficient than coal/naphtha-based ones
- CNG/PNG can displace oil products in transport and cooking
Infrastructure to close the gap:
| Infrastructure | Status |
|---|---|
| National Gas Grid | 24,623 km operational; 10,860 km under construction (PNGRB) |
| City Gas Distribution (CGD) | Expanded to 300+ geographical areas nationwide |
| LNG import terminals | 7-8 terminals; total capacity ~47-52 MMTPA; India became 4th largest LNG importer globally in 2024 |
| Key LNG terminal | Dahej (Petronet LNG, Gujarat): 17.5 MMTPA -- largest in India |
| LNG supply sources | Qatar (largest, long-term contracts), USA, Australia, UAE, spot market |
The challenge:
- Achieving 15% by 2030 requires more than doubling gas's share in ~6 years -- IEA projects India's gas demand will rise ~60% by 2030 but even this may not reach 15%
- Gas is expensive relative to coal for power generation; domestic production growth is slow
- Pipeline infrastructure in many states is still incomplete -- "last mile" gas connectivity is a persistent bottleneck
Exam Strategy
Prelims traps:
- Anthracite has highest carbon content and energy value — lignite (brown coal) has the least
- Jharia = coking coal (for steel), also has India's longest-burning underground mine fire
- Mumbai High = offshore petroleum, NOT natural gas field primarily
- Ethanol blending target E20 = 20% ethanol in petrol; India achieved ~19.2% average in ESY 2024-25 (Nov 2024-Oct 2025), hitting 20% in October 2025 -- effectively a year ahead of the ESY 2025-26 deadline
- India is the 2nd largest refiner in Asia (after China), NOT the 1st
- CNG transition in Delhi public transport = 2001–02 (post Supreme Court order) — not 2010 or later
- India crossed 1 billion tonnes coal production for the first time in FY2024-25 (1,047.67 MT) — India is 2nd largest coal producer globally (after China)
Mains angles:
- India's coal dependency vs climate commitments — the "just transition" challenge
- Ethanol blending programme: progress, potential, limitations
- Strategic petroleum reserves and India's energy security
Practice Questions
Prelims:
With reference to India's coal sector, which of the following statements is correct?
(a) Anthracite coal is the most abundantly found type in India
(b) Lignite deposits are mainly found in Jharkhand and Odisha
(c) Coal India Limited is the world's largest coal mining company by production
(d) India does not import coal as it is self-sufficient in reservesThe "SATAT" scheme, seen in the news, is related to:
(a) Solar energy storage
(b) Strategic petroleum reserves
(c) Compressed Biogas as a transport fuel
(d) Electric vehicle charging infrastructure
Mains:
India's commitment to net zero by 2070 requires a major overhaul of its energy mix dominated by coal. Discuss the challenges and opportunities in India's coal-to-clean energy transition, with specific reference to "just transition" concerns. (CSE Mains 2023, GS Paper 3, 15 marks)
Examine the significance of the Ethanol Blending Programme (EBP) for India's energy security and agricultural economy. What are the limitations in achieving the E20 target? (CSE Mains 2021, GS Paper 3, 15 marks)
