Energy Resource Regions of India

India’s energy resource distribution is highly unequal, heavily governed by the country’s geological structure. The peninsular shield houses the bulk of coal, metallic minerals, and mica, while the sedimentary basins on the flanks of the peninsula (in Assam and Gujarat) and offshore basins hold major petroleum and natural gas reserves.

1. Coal Resource Regions

Coal is the mainstay of India’s energy sector, accounting for over 55% of the country’s commercial energy needs. Indian coal belongs to two distinct geological eras: Gondwana formations and Tertiary formations.

Gondwana Coalfields (Permian Era)

Gondwana coal constitutes 98% of India’s total coal reserves and 99% of its production. It is largely free from moisture but contains variable sulfur and high ash content.

• Damodar Valley Region (Jharkhand-West Bengal): This is the premier coal region of India, yielding the finest metallurgical coking coal.
  • Key Fields: Jharia (largest coking coal repository), Raniganj (oldest coalfield, first mined in 1774), Bokaro, Giridih, and Karanpura.
• Son Valley Region (Madhya Pradesh-Chhattisgarh): ” Key Fields: Singrauli (contains the thickest coal seam in India, the Jhingurda seam), Umaria, Sohagpur, Korba, and Tatapani.
• Mahanadi Valley Region (Odisha-Chhattisgarh):
  • Key Fields: Talcher (highest reserves in Odisha) and Ib Valley.
• Wardha-Godavari Valley Region (Maharashtra-Andhra Pradesh-Telangana):
  • Key Fields: Singareni (Telangana), Chanda, Wardha, and Kamptee (Maharashtra).

Tertiary Coalfields (Eocene to Oligocene Era)

Tertiary coal is of younger geological age, has high moisture and sulfur content, and consists mostly of lignite and brown coal.

• Neyveli Region (Tamil Nadu): Contains India’s largest lignite deposits.
• Northeast Region: Found in the Namchik-Namphuk (Arunachal Pradesh), Makum (Assam), and Langrin (Meghalaya) fields.

2. Petroleum and Natural Gas Regions

Hydrocarbon reserves in India are distributed across 26 sedimentary basins covering an area of 3.14 million square kilometers.

Onshore Oil and Gas Regions

• The Brahmaputra Valley (Assam): The oldest oil-producing region in India.
  • Key Fields: Digboi (India’s oldest operating refinery, commissioned in 1901), Naharkatiya, Moran-Hugrijan, and Rudrasagar.
• Gujarat Coast / Cambay Basin: ” Key Fields: Ankleshwar (termed the ‘Fountain of Prosperity’), Kalol, Nawagam, and Sanand.
• Barmer Basin (Rajasthan): A major recent onshore success story.
  • Key Fields: Mangala, Bhagyam, and Aishwarya (MBA fields), which contribute significantly to India’s domestic crude production.

Offshore Oil and Gas Regions

• Western Offshore Basin: * Key Fields: Mumbai High (discovered in 1974, largest producing field), Bassein (rich in natural gas), and Aliabet Island (Gulf of Khambhat).
• Eastern Offshore Basin (Krishna-Godavari & Cauvery Basins):
  • Key Fields: KG-D6 block, known for deep-water natural gas reserves and methane hydrate deposits.

3. Uranium and Thorium (Nuclear Resource) Regions

Nuclear energy resources are vital for India’s three-stage nuclear power program.

Uranium Deposits

• Singhbhum Shear Zone (Jharkhand): The primary source of domestic uranium. Jaduguda is the first uranium mine cleared in India. Other mines include Bhatin, Narwapahar, and Turamdih.
• Cuddapah Basin (Andhra Pradesh): Large reserves discovered at Tummalapalle. The Uranium Corporation of India Limited (UCIL) confirms this as one of the world’s largest uranium reserves.
• Mahadek Basin (Meghalaya): Significant sandstone-type uranium deposits located at Domiasiat and Wahkyn.

Thorium Deposits

• Monazite Sands: India possesses the world’s largest reserves of Thorium, primarily extracted from Monazite sands.
• Key Regions: Coastal tracts of Kerala (Chavara), Tamil Nadu (Manavalakurichi), Odisha (Chhatrapur), and Andhra Pradesh (Visakhapatnam).

4. Renewable Energy Resource Regions

India’s geographic positioning gives it high potential across various renewable energy zones.

Solar Energy Belts

• Thar Desert Region (Rajasthan & Gujarat): Highest solar insolation zone in India due to cloud-free days throughout the year.
  • Key Facilities: Bhadla Solar Park (Rajasthan), one of the largest automated solar installations globally, and Khavda Renewable Energy Park (Gujarat).
• Deccan Rain Shadow Region: Areas in Madhya Pradesh (Rewa), Karnataka (Pavagada), and Andhra Pradesh (Kurnool) take advantage of low cloud cover to host mega-solar parks.

Wind Energy Corridors

• Western Coastal and Peninsular Regions: Wind energy generation is highly concentrated due to the southwest monsoon winds breaking over coastal terrains.
• Key States: Tamil Nadu (Muoppandal wind farm, the largest onshore wind farm in India), Gujarat (Jakhau), Maharashtra, and Karnataka.

Geothermal and Tidal Energy Sites

• Geothermal Regions: Puga Valley (Ladakh – location of India’s first geothermal power project), Tatapani (Chhattisgarh), Manikaran (Himachal Pradesh), and Bakreshwar (West Bengal).
• Tidal Energy Regions: The Gulf of Khambhat and Gulf of Kutch (Gujarat), alongside the Sundarbans delta region (West Bengal), showcase maximum tidal ranges suited for tidal power generation.

Key Facts and Trivia for Prelims

• National Coal Index (NCI): A price index combining coal prices from all sales channels, used as a benchmark for revenue sharing in commercial coal mining.
• HELP vs NELP: The Hydrocarbon Exploration and Licensing Policy (HELP) replaced the New Exploration Licensing Policy (NELP). HELP introduced an Open Acreage Licensing Policy (OALP) and a uniform licensing system for all hydrocarbons (coal bed methane, shale oil, gas, and crude).
• Strategic Petroleum Reserves (SPR): India has built underground rock caverns to store crude oil for energy security at three locations: Visakhapatnam (Andhra Pradesh), Mangaluru (Karnataka), and Padur (Karnataka).
• Coal Bed Methane (CBM): An unconventional form of natural gas found in coal deposits. Major CBM blocks are located in the Raniganj field (West Bengal), Jharia (Jharkhand), and Sohagpur (Madhya Pradesh).