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 ~319 billion tonnes GSI; 4th largest globally
Coal production ~997 million tonnes FY2023-24 (record)
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 ~13–14% FY2024 average

PART 2 — Detailed Notes

Fossil Fuels — Formation

Key Term

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 300–350 million years
  • 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 Connect

UPSC GS3 — India's Coal Sector: Coal India Limited (CIL): State-owned enterprise; world's largest coal mining company by production. Produces ~85% 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 Connect

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:

  1. Ethanol Blending Programme (EBP): India achieved ~13% blending in petrol in FY2024; target of E20 (20% ethanol) by 2025-26. Ethanol sourced from sugarcane (molasses, juice), maize, damaged foodgrains. Benefits: reduces import bill, reduces vehicular emissions, provides income to farmers.

  2. 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).

  3. Electric Vehicles (EVs): FAME-II (Faster Adoption and Manufacturing of Electric Vehicles) scheme — incentives for EV purchase; National EV Mission targets 30% EV sales by 2030 (EV30@30). Production Linked Incentive (PLI) for advanced battery manufacturing.

  4. 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 Connect

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.

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 by 2025-26 (NOT E10 or E15)
  • 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

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

Previous Year Questions

Prelims:

  1. 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 reserves

  2. The "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:

  1. 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)

  2. 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)