⚡ Energy Resources (Part 2) — Conventional & Non-Conventional Sources

Classification of Energy Sources

Section A — Conventional Sources

1. Coal

Types of Coal (by Carbon Content)

Uses of Coal

• Thermal power generation (~70% of coal use): Coal-fired thermal power plants generate ~70% of India's electricity. Major thermal plants: Vindhyachal (MP), Singrauli (UP), Korba (Chhattisgarh), Ramagundam (Telangana), Neyveli (TN — lignite).
• Steel industry (~10%): Coking coal (high-grade bituminous) is essential for making steel in blast furnaces. India imports ~50% of its coking coal from Australia because domestic coking coal is limited and low-grade.
• Industrial uses: Cement, brick kilns, ceramics, glass, paper, chemicals, fertilisers — coal is used as fuel and as a raw material.
• Household fuel: Coal and coal products (coke, coal gas) are used for cooking and heating in some regions, though this use is declining.
• By-products: Coal tar (chemicals, medicines, dyes, paints), coal gas (fuel, lighting, heating), coke (fuel for steel, smokeless fuel), ammonia (fertilisers).

Distribution of Coal in India

Advantages of Coal Energy

• Abundant in India — we have enough reserves for ~100+ years at current consumption.
• Relatively cheap compared to other sources (petroleum, nuclear, solar).
• Established technology and infrastructure — thermal power plants, mining, transport.
• Can be stored easily — unlike solar or wind which are intermittent.
• Versatile — used for electricity, steel, cement, chemicals, and household fuel.

Disadvantages of Coal Energy

• Non-renewable and exhaustible — will eventually run out.
• High pollution — burning coal releases CO₂, SO₂, NOₓ, mercury, and particulate matter. Major contributor to climate change and air pollution (India has 14 of the world's 20 most polluted cities).
• Ash generation — Indian coal has high ash content (30-45%) — generates millions of tonnes of fly ash, which contaminates water and soil.
• Mining hazards — underground mining is dangerous (accidents, fires in Jharia coal field since 1916).
• Water intensive — thermal power plants need large amounts of water for cooling.
• Environmental damage — deforestation, land subsidence, pollution of rivers and groundwater near mining areas.

2. Petroleum (Mineral Oil)

Major Oil Fields of India

Advantages of Petroleum

• High calorific value — more energy per unit weight than coal. Burns cleaner than coal (less ash, less SO₂).
• Liquid fuel — easy to transport (pipelines, tankers, road), store, and handle.
• Versatile — used in transportation (petrol, diesel, jet fuel, marine fuel), industry, power generation, and as raw material for petrochemicals (plastics, synthetic fibres, detergents, fertilisers, medicines, cosmetics).
• Essential for modern transport — no viable large-scale substitute for liquid fuels in aviation, shipping, and road transport.
• Efficient power generation: Oil-fired power plants can be started and stopped quickly (used for peak load management).

Disadvantages of Petroleum

• Non-renewable and exhaustible — India's reserves will last only ~20-25 years at current consumption.
• High import dependence (~80%) — drains foreign exchange (~₹7-8 lakh crore annually). Geopolitical vulnerability (Middle East instability affects oil prices and supply).
• Pollution — burning petroleum releases CO₂, NOₓ, and particulate matter. Contributes to global warming and air pollution. Oil spills (e.g., ship accidents, pipeline leaks) cause devastating marine damage.
• Price volatility — crude oil prices are determined globally and fluctuate wildly (geopolitical factors, OPEC decisions, supply-demand imbalances).
• Subsidies burden — the government spends heavily on fuel subsidies (LPG, kerosene, diesel historically).

3. Natural Gas

Major Gas Fields

• Krishna-Godavari (KG) Basin (Andhra Pradesh — offshore) — largest gas field, D6 block (Reliance Industries) produces ~50% of India's natural gas.
• Mumbai High (offshore Maharashtra) — associated gas from oil production.
• Gujarat — Gandhar, Hazira, Cambay basin (both onshore and offshore). Hazira is a major LNG terminal.
• Assam & Tripura — Badarpur (Assam), Tripura gas fields. Power plants in Tripura run on local gas.
• Rajasthan — Barmer (associated gas from Mangala oil field).
• Cauvery Basin (Tamil Nadu — offshore) — smaller fields.

Uses of Natural Gas

• Power generation (~40%): Gas-based power plants (combined cycle) are efficient and cleaner than coal. Major plants: Hazira (Gujarat), Kawas (Gujarat), Dadri (UP), Anta (Rajasthan), Auraiya (UP), Tripura gas power plant.
• Fertiliser industry (~25%): Natural gas is the primary feedstock for urea fertiliser production in India. Gas-based fertiliser plants: Hazira, Jagdishpur, Thal (Maharashtra), Bijapur (Karnataka).
• Compressed Natural Gas (CNG) (~10%): Used as transport fuel — cleaner than petrol/diesel. Delhi, Mumbai, Gujarat have extensive CNG networks. The landmark Supreme Court order (1998) mandated CNG for public transport in Delhi — dramatically improved air quality.
• Piped Natural Gas (PNG) (~5%): Supplied to households for cooking and heating through city gas distribution networks.
• Petrochemical industry: Natural gas is used as raw material for methanol, ammonia, and other chemicals.
• LNG (Liquefied Natural Gas): Natural gas is liquefied (cooled to -162°C) for transport by ships. India imports ~50% of its gas as LNG from Qatar, US, Australia, Russia. Major LNG terminals: Dahej (Gujarat — largest), Hazira (Gujarat), Kochi (Kerala), Dabhol (Maharashtra), Ennore (Tamil Nadu).

Major Gas Pipelines of India

• HVJ (Hazira-Vijaipur-Jagdishpur) pipeline: ~1,800 km — longest network. Carries gas from Hazira (Gujarat) to Vijaipur (MP) and Jagdishpur (UP). Connects the "Golden Corridor" of fertiliser and power plants.
• Barauni-Guwahati pipeline: Carries gas from Assam to Bihar.
• Kochi-Koottanad-Madurai pipeline: GAIL pipeline to supply LNG from Kochi terminal.
• URAN-BRPL pipeline: Carries gas from Mumbai High to the Bharat Petroleum refinery at Uran.
• GAIL's Jagdishpur-Haldia & Bokaro-Dharma pipeline (Pradhan Mantri Urja Ganga): ~3,400 km — aims to supply PNG and CNG to Eastern India (UP, Bihar, Jharkhand, West Bengal, Odisha).

4. Nuclear Power

Nuclear Fuel Resources

• Uranium: Found in Jaduguda, Bhatin, Bagjata, Mohuldih, Turamdih (Jharkhand) — the only commercial uranium mines in India. Small deposits in Meghalaya (Domiasiat), Andhra Pradesh (Guntur), Karnataka, Rajasthan. India has limited uranium — only ~1-2% of global reserves. India imports uranium from Kazakhstan, Russia, Canada, and Australia (after the 2008 US-India civil nuclear deal).
• Thorium: India has the largest thorium reserves in the world (~25% of global reserves). Found in monazite sands along the Kerala coast (Kollam, Alappuzha), Tamil Nadu (Kanyakumari, Tuticorin), Odisha, Andhra Pradesh. Thorium is the key to India's long-term energy security — if the 3-stage programme succeeds, India can produce energy for centuries.

Nuclear Power Plants in India

Advantages of Nuclear Power

• Low fuel consumption — 1 kg of uranium produces as much energy as ~3,500 tonnes of coal. Very small physical volume of fuel.
• Low carbon emissions — no CO₂, SO₂, or NOₓ during operation. Helps India meet its climate commitments (Net Zero 2070).
• High energy density — continuous power (base load) — operates 24x7, unlike solar/wind.
• Thorium potential — India has abundant thorium, which can provide energy security for centuries.
• Indigenous capability — NPCIL (Nuclear Power Corporation of India Ltd) designs, builds, and operates plants. The 700 MW PHWR is a fully indigenous design.
• Small land footprint — a nuclear plant requires much less land than a solar farm or wind farm for the same energy output.

Disadvantages of Nuclear Power

• High capital cost — building a nuclear plant costs ~₹10-15 crore per MW (2-3x more than thermal or solar). Long gestation period (8-12 years from approval to operation).
• Radioactive waste — remains hazardous for thousands of years. Safe disposal is a serious challenge (deep geological repositories). India has limited high-level waste storage capacity.
• Risk of accidents — Chernobyl (1986), Fukushima (2011) — though Indian reactors have excellent safety records, public opposition remains strong (especially after Fukushima). Kudankulam faced significant local protests (2011-2016).
• Limited domestic uranium — India has only ~1-2% of global uranium reserves. Heavy dependence on imports creates strategic vulnerability.
• Nuclear proliferation concerns — India is not a signatory to the NPT (Nuclear Non-Proliferation Treaty). The 2008 NSG waiver allows nuclear trade, but some restrictions remain.
• Decommissioning cost — shutting down and dismantling a nuclear plant at the end of its life (40-60 years) is extremely expensive.

5. Hydropower (Hydroelectricity)

Major Hydropower Projects in India

Advantages of Hydropower

• Renewable and clean — no fuel is burned, no CO₂, no SO₂, no ash. Does not deplete any resource.
• Low operating cost — once a dam is built, the "fuel" (water) is free. No fuel purchase, transport, or storage needed.
• Long lifespan — dams can operate for 100+ years with proper maintenance (much longer than thermal or nuclear plants).
• Quick start-up — hydro turbines can start generating in seconds (used for peak load management and grid stabilisation).
• Multi-purpose benefits — dams provide irrigation, flood control, drinking water, fisheries, and recreation in addition to power. Tehri, Bhakra, Hirakud, and Sardar Sarovar are multi-purpose projects.
• Pumped storage — water can be pumped back into the reservoir during low-demand hours and released during peak hours (energy storage — "water battery").
• Energy security — no fuel import dependence — domestic resource, strategic advantage.

Disadvantages of Hydropower

• High initial capital cost — dam construction is extremely expensive. Tehri Dam cost ~₹7,000-8,000 crore. Sardar Sarovar cost escalated from ₹4,000 to >₹1,00,000 crore.
• Displacement of people — dams submerge villages, forests, and farmland. Sardar Sarovar displaced ~3 lakh tribals. Narmada Bachao Andolan (Medha Patkar) protested it for decades.
• Environmental impact — submerges forests → loss of biodiversity. Alters river ecology, affects fish migration (especially problematic for Hilsa in Narmada and Brahmaputra). Reservoir siltation reduces useful life of dams.
• Dependence on monsoon — India's hydropower generation varies significantly with rainfall. Poor monsoons (e.g., 2015, 2018) lead to reduced hydro generation. Climate change is making rainfall more uncertain.
• Seismic risk — large reservoirs can induce earthquakes (Koyna dam is a well-documented case of reservoir-induced seismicity). Himalayan projects (Tehri) are in seismically active zones.
• Glacial retreat — many Himalayan hydro projects depend on glacier-fed rivers. Climate change is causing glaciers to retreat, which could reduce long-term water availability.

Section B — Non-Conventional (Renewable) Sources

1. Solar Energy

Major Solar Parks in India

• Bhadla Solar Park (Rajasthan) — ~2,250 MW — largest solar park in the world (as of 2024-25). Located in the Thar Desert (Jodhpur district). Low rainfall, high solar radiation, abundant land.
• Pavagada Solar Park (Karnataka — Tumakuru) — ~2,050 MW — second largest in India. Set up on degraded government land. "Shakti Sthala" — landmark PPP project.
• Kurnool Solar Park (Andhra Pradesh) — ~1,000 MW. One of the earliest large-scale parks.
• Rewa Solar Project (Madhya Pradesh) — ~750 MW. First solar plant to supply power to the Delhi Metro.
• Kamuthi Solar Project (Tamil Nadu — Ramanathapuram) — ~648 MW. Single-location plant (not a park).
• Charanka Solar Park (Gujarat — Patan) — ~600 MW. Asia's first solar park (commissioned 2012).

Jawaharlal Nehru National Solar Mission (JNNSM)

• Launched 2010 — part of the National Action Plan on Climate Change (NAPCC).
• Initial target: 20 GW solar capacity by 2022. This was achieved 4 years early (2018). Target was revised to 100 GW by 2022 (not fully achieved — ~80 GW by 2026).
• Components: (a) Large-scale solar parks (Roof top + ground mounted). (b) Off-grid solar applications (solar pumps, solar home lighting). (c) R&D in solar technology. (d) Manufacturing of solar cells and modules (PLI scheme for domestic manufacturing).
• Production Linked Incentive (PLI) scheme for solar PV manufacturing — aims to reduce India's dependence on Chinese solar imports (~80% of modules currently imported from China).

Advantages of Solar Energy

• Abundant and free — India receives ~5,000 trillion kWh/year. Most regions get 300+ sunny days. No fuel cost.
• Clean and green — zero emissions during operation. Crucial for climate goals (Net Zero 2070).
• Decentralised — can be installed on rooftops, in villages, deserts — no need for large centralised plants. Ideal for rural electrification (solar microgrids).
• Low operating cost — once installed, solar panels produce electricity for 25+ years with minimal maintenance.
• Falling cost — solar module prices have fallen ~90% in the last decade. Solar is now cheaper than coal on a levelised cost basis (₹2.5-3 per kWh vs ₹3.5-4 for thermal).
• Subsidies & policy support — 40-60% subsidy for rooftop solar (Pradhan Mantri Surya Ghar Yojana — PM Surya Ghar). Priority grid access for solar projects.

Disadvantages of Solar Energy

• Intermittent and variable — only generates during daytime; cloud cover reduces output. Not available at night. Requires energy storage (batteries) — which is still expensive.
• Large land requirement — 1 MW of solar requires ~4-5 acres. Large-scale parks need vast tracts of land (land acquisition is a challenge).
• Low efficiency — typical solar panels convert only 18-22% of sunlight into electricity. Newer technologies (perovskite) promise 30%+ but are not yet commercial.
• High initial cost — though prices have fallen, the upfront investment for a complete solar system (panels + inverter + battery) is still significant for households.
• Manufacturing dependence — India imports ~80% of solar cells from China (module imports also high). The PLI scheme aims to reduce this dependence but will take time.
• E-waste — solar panels have a lifespan of 25-30 years. Recycling of old panels is an emerging challenge.

2. Biogas

Biogas Generation Process (Step-by-Step)

Step-by-step process:

1. Feedstock preparation: Cow dung (or other organic waste) is mixed with water in a 1:1 ratio to form a slurry. About 25-40 kg of dung per day from 2-3 cattle is enough for a family-sized plant.
2. Feeding the digester: The slurry is fed into the inlet tank, which flows into the digestion chamber (an underground brick/masonry tank). The chamber is sealed (airtight) to create oxygen-free conditions.
3. Anaerobic digestion (10-30 days): Anaerobic bacteria (methanogens) break down the organic matter in the absence of oxygen. The process occurs in 3 stages: (a) Hydrolysis — complex organic matter breaks into simpler compounds. (b) Acidogenesis — simple compounds are converted into organic acids. (c) Methanogenesis — methanogenic bacteria convert acids into methane (CH₄) and carbon dioxide (CO₂) — this is the biogas. The process is most efficient at 30-40°C (mesophilic range).
4. Gas collection: Biogas rises and gets trapped in the gas holder (floating drum or fixed-dome). The drum rises as gas accumulates — the height indicates how much gas is stored. The gas pressure pushes it through the gas outlet pipe to the kitchen or generator.
5. Slurry removal: The spent slurry (digested residue) flows out through the outlet tank. It is collected in a pit, dried, and used as organic fertiliser (rich in nitrogen, phosphorus, potassium — NPK). The slurry is odourless and pathogen-free — better than raw cow dung.

Advantages of Biogas

• Clean fuel — burns with a clear blue flame — no smoke (unlike wood/coal). Reduces indoor air pollution (a major health issue in rural India — WHO estimates ~5 lakh deaths/year from indoor smoke).
• Waste-to-energy — converts animal waste, crop residue, and kitchen waste into useful fuel. Reduces waste dumping and flies.
• By-product (slurry) as fertiliser — the spent slurry is an excellent organic fertiliser — richer in nutrients than raw dung. Reduces the need for chemical fertilisers. Improves soil health.
• Renewable and sustainable — organic waste is continuously available. No depletion. Can be produced locally.
• Reduces deforestation — replaces firewood for cooking (a family needs ~500 kg of firewood/year). Saves trees and reduces the burden on forests.
• Reduces methane emissions — if cow dung is left to decompose in the open, it releases methane (a potent greenhouse gas — 25x more potent than CO₂). Capturing it as biogas reduces emissions.
• Government support — Gobar-Dhan scheme (2018) — financial assistance for biogas plants. SATAT scheme (Sustainable Alternative Towards Affordable Transportation) — promotes compressed biogas (CBG) as transport fuel.

Disadvantages of Biogas

• Requires regular feedstock — needs a continuous supply of dung/organic waste. A family needs 2-3 cattle for a small plant. Not suitable for urban households.
• Temperature sensitive — bacterial activity is optimal at 30-40°C. In cold regions (Himalayas, North India in winter), biogas production drops significantly. Insulation/heaters are needed.
• High initial cost — a family-sized biogas plant costs ₹15,000-30,000. Government subsidies cover ~30-50%, but the upfront cost is still significant for poor rural households.
• Contains H₂S — hydrogen sulphide corrodes pipes and appliances. Needs filtering (iron oxide scrubber) before use in engines/generators.
• Not continuous — gas production continues 24x7, but if not used, the drum may overflow. A storage balloon or alternative use (generator) is needed.

3. Wind Energy

Major Wind Farms in India

Advantages of Wind Energy

• Renewable and clean — no fuel, no emissions, no pollution. One wind turbine saves ~5,000 tonnes of CO₂ per year compared to coal.
• Low operating cost — once installed, wind is free. Operating cost is ~₹0.5-1 per kWh (mainly maintenance).
• Land can be dual-used — wind turbines occupy only ~1% of the land area (base). The remaining 99% can be used for agriculture or grazing. Farmers can earn lease income from turbine operators.
• Fast installation — wind farms can be set up in 12-18 months (much faster than thermal or nuclear plants).
• Job creation — wind energy creates ~10x more jobs per MW than coal (manufacturing, installation, O&M).
• Offshore potential — Gujarat and Tamil Nadu have huge offshore wind potential (35 GW+). India launched its first offshore wind tender in 2024-25.

Disadvantages of Wind Energy

• Intermittent and unpredictable — wind does not blow consistently. Output varies minute-to-minute. Requires backup power (thermal/gas) or energy storage (batteries, pumped hydro).
• Location constraints — best wind sites are often far from cities (transmission lines needed). Wind speeds are seasonal (strong in monsoon, weak in other months).
• Noise and visual impact — wind turbines produce noise (~40-55 dB at 300 m). Some people find them visually unattractive. Local opposition in some areas (e.g., Western Ghats, ecologically sensitive zones).
• Bird and bat collisions — turbine blades can kill birds and bats (especially migratory birds). Proper site selection can minimise this. India has not had major bird-strike issues compared to the US/Europe.
• High initial capital cost — a 2 MW wind turbine costs ~₹12-15 crore (₹6-7 crore per MW). Land acquisition for large wind farms can be challenging.
• Maintenance in remote areas — wind farms are often in remote, hilly, or coastal areas — access for maintenance can be difficult. Offshore wind is even more expensive to maintain.

4. Tidal Energy

Potential Sites for Tidal Energy in India

• Gulf of Khambhat (Gujarat): ~7,000 MW potential — highest tidal range in India (~11 m). The most promising site for tidal barrage. Proposed 200 MW tidal plant at Kalpasar (feasibility study by Government of Gujarat and Atlantis Resources). The Gulf of Khambhat has the 3rd highest tidal range in the world (after Fundy Bay, Canada and Severn Estuary, UK).
• Gulf of Kutch (Gujarat): ~1,000 MW potential — tidal range ~5-6 m. A 50 kW demonstration tidal plant was set up by the National Institute of Ocean Technology (NIOT) in 2015.
• Sundarbans (West Bengal): Potential ~500 MW — tidal range ~4-5 m. The deltaic region has many tidal creeks. Environmental sensitivity (Royal Bengal Tiger habitat) limits development.
• Hooghly estuary (West Bengal): Potential ~500 MW — tidal range ~4-6 m. Near the Kolkata-Howrah region.
• Andaman & Nicobar Islands: Potential ~100 MW — small tidal range but localised need for energy (diesel is currently the main source — expensive and polluting).

Advantages of Tidal Energy

• Highly predictable — tides are completely predictable (unlike solar and wind). We know exactly when high and low tides will occur, years in advance.
• Renewable and clean — no fuel, no emissions, no waste. Very high energy density (water is 800x denser than air — a tidal turbine produces much more power than a wind turbine of the same size).
• Long lifespan — tidal barrages can operate for 100+ years. Low maintenance costs after construction.
• Storm surge protection — tidal barrages can act as storm barriers — protecting coastal areas from flooding (similar to the Thames Barrier in London).

Disadvantages of Tidal Energy

• Very high capital cost — building a tidal barrage across a river mouth is extremely expensive. The proposed Gulf of Khambhat project (~200 MW) is expected to cost ~₹6,000-8,000 crore.
• Environmental impact on estuaries — a tidal barrage changes the estuarine ecosystem — affects fish migration, bird feeding grounds, and sediment transport. The Sundarbans and Gulf of Khambhat are ecologically sensitive areas.
• Intermittent generation — power is generated only during the incoming and outgoing tides (4-5 hours per tide, 2 tides per day — ~8-10 hours of generation per day). Output varies with the tidal cycle (spring tides vs neap tides).
• Limited locations — only ~20-30 sites worldwide have sufficient tidal range (>5 m) for cost-effective generation. India has only a few such sites (Gujarat, Sundarbans).
• Navigation interference — a barrage blocks ship traffic. Ships need locks to pass through, adding cost and complexity.

5. Geothermal Energy

Major Geothermal Sites in India

Advantages of Geothermal Energy

• Baseload power (24x7) — geothermal plants operate ~90-95% of the time — much more reliable than solar/wind (which operate only 15-25% of the time).
• Renewable and clean — no fuel, no combustion, minimal emissions (some CO₂ is released, but 10-20x less than coal). Very small land footprint.
• Small land area — a 100 MW geothermal plant needs ~5 acres (vs ~500 acres for solar or ~2,000 acres for wind farm).
• Local resource — reduces energy import dependence. Can be used for direct heating (greenhouses, fish farming, bathing) in addition to power.
• Constant output — unaffected by weather, time of day, or season (unlike solar/wind/hydro).

Disadvantages of Geothermal Energy

• High upfront exploration cost — drilling a geothermal well costs ₹50-100 crore. There is a risk of "dry holes" (no viable steam found) — estimated 20-30% failure rate. India has extensive heat flow data (GSI) but needs detailed exploration.
• Limited to specific locations — geothermal energy is only viable where the Earth's crust is thin and hot water/steam is accessible near the surface. India's potential sites are remote (Ladakh, Himachal, Andaman).
• Can cause induced seismicity — injecting water into hot rocks can trigger small earthquakes (Enhanced Geothermal Systems — EGS). This has been a concern in countries like Switzerland and the US.
• Corrosion and scaling — geothermal water contains dissolved minerals (silica, calcium, salts) that can corrode pipes and turbines. Regular maintenance is needed.
• Re-injection needed — the geothermal fluid (water/steam) must be re-injected into the reservoir to maintain pressure and prevent land subsidence. This adds cost.

8) Energy Mix — India at a Glance

9) ICSE Board Questions — Past 10 Years PYQ Pattern

1-Mark / Short Answer Questions:

1. Name the four types of coal in order of carbon content. Ans: Anthracite (80-90%), Bituminous (60-80%), Lignite (40-55%), Peat (<40%).
2. Which is the best quality coal? Ans: Anthracite — highest carbon content (80-90%), highest calorific value.
3. Name the major coal fields of India (any four). Ans: Jharia (Jharkhand), Raniganj (WB), Talcher (Odisha), Korba (Chhattisgarh).
4. What is coking coal? Ans: High-grade bituminous coal used in the steel industry for making coke (essential for blast furnaces).
5. Name the largest oil field of India. Ans: Mumbai High (offshore, Maharashtra).
6. Name the oldest oil field of India. Ans: Digboi (Assam) — Asia's first oil well (1867).
7. What are the uses of natural gas? Ans: Power generation, fertiliser industry, CNG (transport), PNG (cooking), petrochemical feedstock.
8. Name the largest gas field of India. Ans: KG Basin (D6 block, Andhra Pradesh — offshore).
9. What is the HVJ pipeline? Ans: Hazira-Vijaipur-Jagdishpur pipeline — longest gas pipeline network in India (~1,800 km).
10. Name India's first nuclear power plant. Ans: Tarapur Atomic Power Station (Maharashtra, 1969).
11. Name the largest nuclear power plant in India. Ans: Kudankulam (Tamil Nadu) — 2,000 MW (2 x 1,000 MW).
12. Name India's first indigenous 700 MW nuclear reactor. Ans: Kakrapar Atomic Power Project (KAPP-3, Gujarat — commissioned 2024).
13. Name the highest dam in India. Ans: Tehri Dam (Uttarakhand) — 260.5 m.
14. Name the largest completed hydroelectric project in India. Ans: Koyna Hydroelectric Project (Maharashtra — 1,960 MW).
15. Differentiate between conventional and non-conventional sources of energy. Ans: Conventional = non-renewable, exhaustible, polluting (coal, petroleum, gas, nuclear). Non-conventional = renewable, inexhaustible, clean (solar, wind, biogas, tidal, geothermal).
16. Name the largest solar park in India. Ans: Bhadla Solar Park (Rajasthan) — ~2,250 MW.
17. Name the major wind farm in Tamil Nadu. Ans: Muppandal (Kanyakumari) — largest in India.
18. What is biogas? Ans: A gaseous fuel (~55-65% methane) produced by anaerobic digestion of organic waste (cow dung, crop residue, kitchen waste).
19. Name the most promising geothermal site in India. Ans: Puga Valley (Ladakh).
20. Which states have the highest tidal energy potential? Ans: Gujarat (Gulf of Khambhat — ~7,000 MW, Gulf of Kutch — ~1,000 MW).

3-Mark Questions:

1. Explain the four types of coal with their carbon content and uses.
2. Describe the distribution of coal in India — name any four major coalfields and the states they are located in.
3. Name any four oil fields of India and mention the states where they are located.
4. What are the advantages and disadvantages of hydropower over thermal power? (any three each)
5. Explain the importance of biogas as a non-conventional source of energy. Describe the biogas generation process in brief.
6. Why is solar energy considered the most promising renewable source for India? Give three reasons.
7. Explain the advantages and disadvantages of nuclear power (any three each).
8. What are the non-conventional sources of energy? Explain any two with their uses.
9. Name any four multipurpose hydropower projects of India and the states they are located in.
10. Give geographical reasons for: (a) India imports 80% of its crude oil requirements. (b) Natural gas is called the "cleanest fossil fuel." (c) Solar energy has a bright future in India.

5-Mark / 10-Mark Questions (ICSE Part II):

1. Classify energy resources into conventional and non-conventional. Describe the distribution of coal and petroleum in India with reference to major fields and states.
2. Explain the advantages and disadvantages of hydropower. Name any four major hydropower projects of India and mention the states and rivers associated with them.
3. Discuss the importance of non-conventional sources of energy for India. Describe any three such sources (solar, wind, biogas) with their advantages and limitations.
4. Compare nuclear power and hydropower under the following heads: (a) Source of energy (b) Environmental impact (c) Reliability (d) Capital cost (e) Examples of plants.
5. "India is moving towards a sustainable energy future." Discuss this statement with reference to: (a) The Jawaharlal Nehru National Solar Mission (b) India's renewable energy target for 2030 (c) The role of biogas in rural India.
6. On an outline map of India, mark and name: (a) Two coal fields (Jharia, Talcher) (b) Two oil fields (Mumbai High, Digboi) (c) Two nuclear power plants (Tarapur, Kudankulam) (d) Two hydropower projects (Bhakra, Hirakud).

10) Quick Reference — Memorisation Tables

Energy Sources — Summary

Important Values to Remember