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GS Paper: GS3

  • Seawater intrusion in the coastal aquifers is a major concern in India. What are the causes of seawater intrusion and the remedial measures to combat this hazard?

    Seawater intrusion refers to the landward movement of saline seawater into coastal freshwater aquifers. It is a growing concern along India’s 7,500 km coastline.

    Concerns Associated with Seawater Intrusion

    Loss of Potable Water – Eg – Chennai, Digha and Saurashtra face declining freshwater availability.

    Saline irrigation water damages soils and reduces crop yields.

    Alters wetland hydrology and harms mangroves and estuaries. Eg – in Sundarbans.

    Raises economic burden on households and municipalities. Eg – Chennai’s tanker dependence during summer months.

    Causes of Seawater Intrusion

    Excessive Groundwater Extraction – Over-pumping near coasts lowers freshwater pressure, drawing seawater inland.

    Urbanisation – Concretisation and wetland loss reduce aquifer replenishment. Eg- Chennai has lost 85% of its wetlands. (WWF)

    Sea-Level Rise due to Climate Change – Eg- global mean sea level rose by 0.20 m between 1901 and 2018. (IPCC)

    Sand Mining & Shoreline Alteration – weakens natural coastal barriers.

    Cyclones, and storm surges lead to seawater infiltration in shallow aquifers.

    Coastal areas with sandy soils, porous rocks, or low-lying physiographic depressions allow rapid seawater percolation.

    Absence of systematic groundwater management and poor infrastructure regarding artificial recharge

    Dams and upstream diversions reduce the freshwater outflow that naturally counters seawater intrusion. Eg – Narmada estuary showing increased salinity.

    Remedial measures

    Artificial Recharge – Use percolation ponds, recharge shafts, injection wells, and subsurface dykes

    Regulation of Groundwater Extraction – Introduce withdrawal caps, borewell licensing, coastal aquifer zoning

    Adopt low-water crops and saline-resistant varieties to reduce irrigation stress on aquifers. Eg – ICAR-CSSRI (2022) developed salt-tolerant rice

    Rainwater harvesting to reduce dependency on shallow wells (NCCR, 2023). Eg- Chennai

    Mangrove afforestation for reducing wave energy and preventing soil erosion.

    Ecosystem-based coastal protection– Eg- Oyster beds along the coast can serve as natural breakwaters.

    Mitigating seawater intrusion is essential to safeguard coastal aquifers and advance SDG 6 and SDG 13

  • What are the challenges before the Indian economy when the world is moving away from free trade and multilateralism to protectionism and bilateralism? How can these challenges be met?

    According to the Economic Survey, the previous global paradigm of ‘stable geopolitics’ and ‘free trade and investment movement’, has been fading and the foundations on which many nations built themselves are now being shaken.

    World Moving from Free Trade & Multilateralism to Protectionism & Bilateralism

    Trade Wars – US-China tariff wars

    WTO Deadlock over Doha Development Agenda

    Rise of Bilateral/Regional Deals – Eg- RCEP

    Green Protectionism – EU’s Carbon Border Adjustment Mechanism (CBAM), US CHIPS Act

    Challenges before the Indian economy

    Fragmentation of Global Trade due to rise in tariffs, sanctions etc threaten export-oriented sectors. Eg- IT Industry

    Volatile Capital Flows

    Energy security challenges due to sanctions on Russia (40% share)

    Currency Depreciation

    Technology Barriers – New protectionist tools like data localisation rules of EU.

    Employment Impact – Labour-intensive sectors like textiles, gems, and automobiles face slowdown.

    Way Forward

    Internal Measures

    Ease of Doing Business – The Economic Survey (2024-25) key recommendation is ‘to get the domestic economic engine purring by pulling all the levers of deregulation’.

    Raising the investment rate to around 35% of GDP from the current level of ~ 31%.

    Boost domestic demand through high public capex

    Build resilience in semiconductors, defence, and critical minerals under Atmanirbhar Bharat.

    External Measures (Global Integration)

    Diversify Export Markets – Expand trade with Africa, Latin America, Central Asia, and ASEAN.

    Conclude Balanced FTAs – With EU, Canada, Australia.

    Strengthen IMEC, INSTC, and Chabahar Port for secure and cost-effective routes.

    Global South Leadership in WTO to revive dispute settlement and ensure fair rules.

    A self-sustained growth strategy is imperative for India’s long-term economic sovereignty.

  • Distinguish between the Human Development Index (HDI) and Inequality-adjusted Human Development Index (IHDI) with special reference to India. Why is the IHDI considered a better indicator of inclusive growth?

    The Human Development Index (HDI), introduced by UNDP in 1990, measures a country’s progress in terms of health, education, and income. The Inequality-adjusted Human Development Index (IHDI), introduced in 2010, refines HDI by factoring in inequality of distribution of these achievements.

    India’s Human Development Performance

    Human Development Index (HDI)

    Rank improved from out of 193 countries.

    Since 1990, HDI improved by 53%, outpacing global and South Asian averages.

    Inequality-adjusted Human Development Index (IHDI)

    India suffers a 30.7% loss due to inequality.

    Poorest 40% hold only 20.2% of income, while the richest 10% hold 25.5%.

    Why IHDI is a Better Indicator of Inclusive Growth

    Accounts for Inequality – Unlike HDI, IHDI reduces scores based on income, education, and health disparities, showing the real distribution of gains.

    Closer to Ground Reality – Reflects what people actually experience, not just national averages. For India, 30.7% loss of human development due to inequality.

    Reveals Hidden Gaps – Exposes divides across region, caste, class, and gender that HDI alone masks. Eg- gender gap in Labour Force Participation Rate

    Guides Policy Better – Eg- targeted schemes like PM Poshan Abhiyan or Eklavya Model Schools

    Captures Inter-generational Equity – By highlighting disparities, it stresses need for equal opportunities for long-term human development.

    Comparative Value – Countries with similar HDI can differ widely in IHDI, revealing which societies are more inclusive.

    Supports SDGs – Aligns with SDG 10 (Reduce Inequality) and SDG 1 (No Poverty) by showing inequality-adjusted outcomes.

    As Amartya Sen observed, “Development is about expanding freedoms.” HDI shows progress, but IHDI shows whether that progress is fairly shared.

    Government Budgeting

  • Discuss the rationale of the Production Linked Incentive (PLI) scheme. What are its achievements? In what way can the functioning and outcomes of the scheme be improved?

    The PLI scheme, launched in 2020, covers 14 key sectors and provides direct incentives on incremental sales of goods manufactured in India. It aims to raise manufacturing’s contribution to 25% of GDP.

    Rationale of the PLI Scheme

    Boost domestic manufacturing by overcoming the historic 16-17% manufacturing share in GDP.

    Reduce import dependence, especially in critical sectors like electronics, APIs, and solar modules.

    Integrate India into global value chains (GVCs) by attracting global manufacturers.

    Encourage scale, competitiveness, and technology transfer through incentive-based production expansion.

    Generate employment in labour-intensive and high-potential sectors.

    Promote sunrise industries (EVs, semiconductors, telecom, batteries) to position India in future technologies.

    Enhance Exports – Position India as a competitive player in global value chains.

    Achievements So Far

    achieved by PLI beneficiaries (mid-2025).

    Over 12 lakh direct and indirect jobs created.

    India became the 2nd-largest mobile producer, with 97% domestically made.

    Third-largest pharmaceutical producer globally. 50% of total pharma production is exported.

    Automotive Sector – Boosted EV components, hydrogen technologies, and high-tech auto manufacturing.

    Achieved 60% import substitution in telecom equipment.

    Issues

    Falling Manufacturing Share in GDP (from 15.4% to 14.3%) since PLI launch.

    >10% of allocated funds disbursed.

    Delays in Incentive Disbursement

    94% of incentives to pharmaceuticals and mobile-phone manufacturing

    Limited Achievement of Targets only 37% of scheme’s goal.

    Exclusion of MSMEs due to high eligibility thresholds

    Way Forward

    Faster disbursal of incentives to reduce uncertainty and improve industry cash flows.

    Move from scale-based incentives to design, R&D, and innovation incentives (chips, batteries).

    Enhance MSME participation through cluster-based PLI, separate PLI window for MSMEs

    Rationalise value-addition norms – realistic localisation targets.

    Improve coordination between Centre and States to reduce procedural delays.

    Strengthen monitoring, transparency, and impact evaluation through real-time dashboards

    Couple PLI with ease-of-doing-business reforms and plug-and-play infrastructure

    As PM Modi stated, “Aatmanirbharta is the cornerstone of building a Viksit Bharat.” Strengthening PLI can help realise this objective.

  • Biochar offers a way to turn India’s farm smoke into black gold

    Why in the News?

    Punjab and Haryana burn over 20 million tonnes of paddy straw annually because no commercially viable alternative exists for farmers with short post-harvest windows. This mass burning releases greenhouse gases and fine particulate matter while destroying soil organic carbon that depleted soils urgently need. At this time, biochar can come as a solution to India’s twin challenges of stubble burning and declining soil health.

    Why does India’s biomass abundance produce soil poverty rather than soil wealth?

    1. Paradox of abundance: India generates large volumes of crop residue after each harvest. This biomass contains organic carbon that could restore depleted soils. Instead, it is burned in the field.
    2. Structural driver of burning: Short post-harvest intervals between kharif and rabi crops leave farmers with insufficient time to incorporate residue into soil. The absence of affordable alternatives makes open burning the default.
    3. Dual consequence of burning: Burning releases greenhouse gases and fine particulate matter. It also eliminates organic matter that would otherwise improve soil structure, water retention, and microbial activity.
    4. Soil organic carbon crisis: Agricultural soils across India suffer from low soil organic carbon, poor water-holding capacity, and rapid nutrient loss. Low organic carbon reduces crop productivity independently of fertiliser inputs.
    5. Climate vulnerability: Degraded soils with low water-holding capacity make crops more vulnerable to moisture stress. Soil health is therefore a climate adaptation variable, not only a productivity variable.

    What is biochar and what does it do to soil that conventional crop management does not?

    1. Definition: Biochar is the carbon-rich solid produced when organic material is heated at high temperature in a low-oxygen environment through pyrolysis: the thermal decomposition of material in the absence of oxygen.
    2. Persistence: Biochar resists biological decomposition and remains locked in soil for centuries. Conventional compost decomposes quickly, releasing carbon back into the atmosphere.
    3. Porous structure: Biochar is highly porous. This aggregates soil particles, increases water-holding capacity by 10% to 25%, and creates microhabitats for beneficial soil microorganisms.
    4. Productivity gains: Studies indicate biochar addition to degraded soils improves crop productivity by 10% to 30%, particularly in nutrient-poor soils.
    5. Field evidence from India: Biochar from maize stalks applied to black soils in Akola, Maharashtra improved soil organic carbon and overall soil fertility in field trials. Kerala research on coconut leaf stalk biochar showed improved soil quality across cropping systems.
    6. Integration pathway: Biochar can be incorporated into natural farming, soil health management, and carbon farming programmes without requiring farmers to change cropping systems.

    What problem does biochar seek to solve?

    1. Crop residue burning: Punjab and Haryana burn over 20 million tonnes of paddy straw annually due to short harvesting windows and limited alternatives.
    2. Air pollution: Residue burning releases greenhouse gases and fine particulate matter.
    3. Loss of soil nutrients: Burning destroys organic matter that could have been returned to agricultural soils.
    4. Declining soil quality: Many Indian soils suffer from low soil organic carbon, poor water retention, and nutrient depletion.
    5. Resource inefficiency: Agricultural biomass is treated as waste instead of being recycled into productive use.

    Why is biochar relevant for India’s climate and sustainability goals?

    1. Climate adaptation: Healthy soils improve resilience against droughts, heatwaves, and erratic rainfall.
    2. Reduced input dependence: Better nutrient retention lowers reliance on external inputs.
    3. Support for natural farming: Biochar complements natural farming and soil health initiatives.
    4. Carbon sequestration: It removes carbon from the atmosphere and stores it in soils.
    5. Circular economy: Agricultural waste is converted into a productive resource.

    How do carbon credits convert biochar from an agronomic input into an economic model for farmers and cooperatives?

    1. Carbon credit mechanism: Biochar sequesters carbon dioxide in stable form. Verified sequestration earns carbon credits tradeable on voluntary and compliance carbon markets.
    2. Rigorous eligibility of biochar carbon: Biochar carbon satisfies rigorous stability criteria for long-term sequestration. It is classifiable as persistent carbon dioxide removal under accepted accounting standards.
    3. Quantified yield per tonne: The VM0042 methodology from Verra quantifies both avoided emissions from residue burning and long-term soil carbon sequestration. Each tonne of certified biochar generates 2.2 to 2.8 tonnes of carbon dioxide-equivalent credits.
    4. Revenue pathway: Certified biochar can be sold on carbon markets at prevailing prices. This provides additional income for project developers, farmers, and cooperatives with no current economic return on residue management.
    5. Policy packaging: The government can package biochar production and carbon registry registration into a single programme. This creates a strong economic incentive for mass adoption among farmers who currently default to burning.
    6. KISAN kiln test case: The KISAN kiln developed at IIT-Kharagpur is being tested in projects that allow smallholder farmers to monetise farm waste through certified biochar production. This confirms the income model is operationally feasible at the farm level.

    What do international examples reveal about the conditions required for biochar to scale beyond pilot projects?

    1. Kenya: rice husk conversion: Kenya has turned rice husks into certified biochar that improves soil pH and phosphorus content. This shows locally available residue can generate internationally certifiable credits without high-cost imported technology.
    2. Thailand: national policy integration: Thailand has pushed biochar adoption through national initiatives linking soil rehabilitation to carbon management. This shows mass adoption requires government-coordinated demand creation, not supply-side technology promotion alone.
    3. Brazil: Embrapa sugarcane biochar: Brazil’s Embrapa Institute has reported high carbon retention and large yield gains from on-farm biochar generated from sugarcane bagasse. National carbon registry access created a direct policy-to-market pipeline sustaining farmer incentives.
    4. Common design feature: All three cases combine decentralised pyrolysis with strong MRV: measurement, reporting, and verification, the process of quantifying emissions reductions to qualify for carbon credits. No country achieved scale without certified MRV.
    5. Implication for India: India possesses similar feedstock diversity and agricultural scale. The gap is the absence of a certified MRV framework linking farm-level production to a national carbon registry accessible to smallholders.

    Why does biochar’s proven effectiveness at the plot level not automatically translate into national adoption?

    1. Pilot trap: Biochar in India remains confined to research trials and pilot projects and is alien to most farmers. A technically proven intervention can remain permanently at pilot scale when the economic incentive structure and delivery ecosystem are absent.
    2. Residue as disposal problem, not resource: Agricultural residues are seen only as a disposal problem in India. This framing prevents investment in the infrastructure needed to treat residue as a revenue-generating raw material.
    3. Carbon market access gap: Accessing carbon markets requires certified MRV, registry registration, and linkage to buyers. Smallholder farmers lack the institutional capacity to navigate this individually. Cooperative aggregators are necessary intermediaries that do not yet exist at scale.
    4. Market linkage absent: Carbon credit revenue requires market linkages, entrepreneurship, and cost-effective technology access. These supply-chain components are absent in most states. The value of biomass can only be realised through an integrated ecosystem linking innovation, investment, and markets simultaneously.
    5. Not a knowledge problem: Pyrolysis technology, carbon accounting methodology, and agronomic evidence all exist. The constraint is consistent failure to assemble the institutional and market infrastructure needed to execute at scale.

    How does expanding biochar feedstock to urban organic waste extend both the circular economy potential and the climate benefit?

    1. Urban feedstock volume: India generates around 62 million tonnes of municipal solid garbage per year. More than 50% is biodegradable. Sewage sludge and crop residues can also be converted into biochar.
    2. Circular economy rationale: Converting urban organic waste into biochar is consistent with circular economy: an economic model that keeps materials in use, regenerates natural systems, and designs out pollution. Waste diverted from landfills stops producing methane and becomes a useful product instead.
    3. Waste-stream conversion: Biochar production from urban organic waste turns large waste streams into a product with economic value. This reduces municipal waste management costs while providing soil amendment supply for agriculture.
    4. Climate mitigation contribution: Urban biochar production combines landfill methane avoidance with long-term soil carbon sequestration. Both effects are separately quantifiable and certifiable, adding to India’s climate mitigation commitments.

    Conclusion

    India’s parallel crises of air pollution and soil degradation share a single root: the treatment of biomass as waste rather than as a resource. Biochar resolves this at the technical level. The unresolved problem is institutional: no integrated ecosystem linking decentralised pyrolysis, certified carbon markets, national registry access, and farmer income pathways currently exists at scale. Even if pyrolysis technology proliferates and carbon credit prices appreciate, these gains cannot reach smallholder farmers without cooperative aggregation structures, state-backed MRV frameworks, and policy packaging that makes the full farm-to-market pipeline accessible. The next step is not more pilots. It is building the infrastructure that converts proven plots into national scale.

    PYQ Relevance

    [UPSC 2022] What is Integrated Farming System? How is it helpful to small and marginal farmers in India?

    Linkage: UPSC asks about sustainable and resource-efficient farming systems that improve productivity and resilience for small and marginal farmers. Biochar strengthens Integrated Farming Systems by improving soil fertility, water retention, and nutrient efficiency, thereby enhancing farm sustainability and incomes.

  • DAE Inaugurates VDPP and 24 kA Prototype Sodium Cell

    Why in News?

    The Department of Atomic Energy (DAE) inaugurated the Versatile Deuterated Compounds Production Plant (VDPP) and commissioned the 24 kA Prototype Sodium Cell at the Heavy Water Board Facilities (HWBF), Vadodara, strengthening India’s indigenous capabilities in strategic nuclear materials.

    Versatile Deuterated Compounds Production Plant (VDPP)

    • Established for indigenous production of high-purity deuterated compounds and solvents.
    • Supports:
      • Advanced scientific research
      • Strategic applications
      • Frontier technologies
    • Reduces dependence on imports of specialized deuterated materials.

    What are Deuterated Compounds?

    • Compounds in which hydrogen (¹H) is replaced by deuterium (²H or D), a stable isotope of hydrogen containing one proton and one neutron.
    • Used in Nuclear technology, NMR spectroscopy, Pharmaceutical research, and Chemical and biological studies

    24 kA Prototype Sodium Cell

    • India’s first indigenous industrial-scale prototype for producing nuclear-grade sodium.
    • Nuclear-grade sodium serves as the coolant in Fast Breeder Reactors (FBRs).
    • Represents a major step toward self-reliance in strategic nuclear materials.

    Significance

    • Strengthens India’s Fast Breeder Reactor Programme.
    • Supports the second stage of India’s three-stage nuclear power programme.
    • Promotes AtmaNirbhar Bharat in critical nuclear technologies.
    • Enhances long-term energy security and technological self-reliance.

  • India’s Space Odyssey: Prelims Quick Revision

    Why in News?

    The Government highlighted India’s achievements under Space Vision 2047, focusing on self-reliance, commercialization, and human spaceflight.

    Major Missions

    • Chandrayaan-3 (2023): First soft landing near Moon’s south pole; confirmed sulphur.
    • Chandrayaan-4 (2027): Lunar sample return mission.
    • LUPEX (2027-28): ISRO-JAXA mission to explore lunar polar ice.
    • Mangalyaan: First country to reach Mars on maiden attempt.
    • Aditya-L1: India’s first solar observatory at Sun-Earth L1.
    • Venus Orbiter Mission: Planned for 2028.
    • Gaganyaan: India’s first human spaceflight programme.
    • Bharatiya Antariksh Station (BAS): First module by 2028.

    Space Technology

    • SpaDeX (2025): India became 4th nation to achieve autonomous space docking.
    • NavIC: Indigenous navigation system covering India and 1,500 km beyond.
    • VIKRAM3201: First indigenous 32-bit space microprocessor.
    • RLV-TD: Developing reusable launch vehicle technology.

    Space Economy

    • Space startups: 1 (2014) → 400+ (2026).
    • Space economy: $8 billion, targeted to reach $40-45 billion by 2030.
    • Major reforms: IN-SPACe, NSIL, Indian Space Policy 2023, Liberalised FDI.

    Launch Infrastructure

    • Operational launch vehicles: PSLV, GSLV, LVM3.
    • NGLV under development (30-ton LEO capacity).
    • Second spaceport: Kulasekarapattinam, Tamil Nadu.
    • Third launch pad approved at Sriharikota.

    International Cooperation

    • NISAR: ISRO-NASA
    • TRISHNA: ISRO-CNES
    • LUPEX: ISRO-JAXA
    • Human spaceflight cooperation with ESA and Russia.

    Space Applications

    • Disaster management, Telemedicine, PM e-VIDYA, India-WRIS, Potential Fishing Zone advisories, and Satellite Aided Search and Rescue (SASAR).

  • [20th June 2026] The Hindu OpED: India’s cheapest power is here, the grid must catch up

    PYQ Relevance[UPSC 2013] Write a note on India’s green energy corridor to alleviate the problem of conventional energy.
    Linkage: The question examines the role of transmission infrastructure in enabling large-scale renewable energy integration.The article shows that transmission bottlenecks, not generation capacity, have become the main constraint on India’s clean-energy transition, reinforcing the importance of the Green Energy Corridor.

    Mentor’s Comment

    India now produces some of the world’s cheapest solar and wind power, yet more than 50 GW of completed renewable capacity remains stranded not because projects are unfinished, but because grid connectivity and transmission is unavailable.

    Why Has Transmission Become the Binding Constraint in India’s Energy Transition?

    1. Cheapest Source of Power: Solar and wind have emerged as India’s lowest-cost electricity sources, with firm clean power available at around ₹3.5 per kWh when paired with storage.
    2. Rapid Renewable Expansion: India added over 45 GW of renewable capacity in 2025 and currently has about 250 GW installed, with another 100 GW under construction.
    3. Existing Base and Pipeline: India currently has about 250 GW of renewable capacity installed and another 100 GW under construction, indicating that transmission expansion is lagging generation growth.
    4. Stranded Renewable Capacity: More than 50 GW of completed renewable projects remain unable to evacuate power due to transmission shortages.
    5. Mismatch in Project Timelines: Renewable projects can be commissioned within 12-18 months, whereas transmission corridors often require 3-5 years.
    6. Future Scale Requirement: India may require nearly 2,000 GW of renewable capacity by 2050 to meet rising electricity demand and electrification goals.

    How Can Existing Grid Assets Unlock Nearly 1,000 GW of Additional Clean Energy?

    1. Storage at Renewable Sites: Batteries can store surplus daytime generation and supply power during evening peaks, significantly increasing utilisation of existing transmission lines.
    2. Reuse of Coal Corridors: Underutilised transmission infrastructure connected to coal plants can be shared with renewable projects, unlocking the equivalent of nearly 100 GW of clean-energy capacity.
    3. Leveraging Existing Substations: Available capacity at transmission substations can accommodate additional renewable connections and support battery integration, enabling another 100 GW equivalent.
    4. Reconductoring Existing Lines: Replacing older conductors with high-temperature, low-sag conductors can nearly double power-carrying capacity on the same towers.
    5. Combined Impact: Storage, shared infrastructure, and reconductoring together can unlock more than 1,000 GW of clean-energy potential within the existing transmission footprint.

    Does Better Grid Utilisation Solve the Problem or Merely Defer It?

    1. Fastest Short-Term Solution: Grid optimisation can be deployed within months and quickly connect stranded renewable projects.
    2. Not a Substitute for Expansion: Existing infrastructure alone cannot support India’s projected renewable requirement of 2,000 GW.
    3. Scale Limitation: Future renewable parks and industrial electrification will require entirely new transmission corridors.
    4. Sequencing Advantage: Optimisation provides immediate relief while larger transmission projects are planned and executed.
    5. Grid Expansion Imperative: India plans a 40% expansion of its transmission network over the next decade, costing more than $100 billion. New corridors must incorporate advanced conductors and storage compatibility to avoid recreating future bottlenecks.
    6. Core Tension: The cheapest and fastest solution is grid optimisation, but the durable solution remains large-scale transmission expansion. Both approaches are necessary.

    What Regulatory and Policy Changes Are Needed?

    1. Storage-Linked Renewable Planning: Regulators should promote greater integration of storage with renewable projects to improve grid utilisation.
    2. State-Level Implementation: States and distribution utilities must incorporate storage and grid-efficiency measures into procurement and planning decisions.
    3. Technology-Oriented Procurement: Procurement norms should reward advanced transmission technologies that expand capacity without requiring new corridors.
    4. Integrated Infrastructure Planning: Renewable energy zones and transmission corridors should be developed in a coordinated manner.
    5. Future-Proof Transmission Design: New transmission infrastructure should be designed for significantly higher renewable penetration from the outset.

    What Does International Experience Reveal About Transmission Bottlenecks?

    1. United States: Delays in connecting renewable projects to the grid have emerged as a major obstacle to the clean-energy transition.
    2. Europe: Several European countries face similar transmission constraints despite substantial renewable deployment.
    3. Common Lesson: Cheap renewable generation alone does not guarantee energy transition success unless transmission capacity keeps pace.
    4. India’s Advantage: A unified national grid and a strong record of transmission expansion provide India with an opportunity to avoid similar bottlenecks.

    Conclusion

    India’s energy transition has moved from a generation challenge to a transmission challenge. The fastest gains lie in optimising existing grid infrastructure through storage, shared transmission assets, and reconductoring, which together can unlock nearly 1,000 GW of additional clean-energy potential. However, optimisation only buys time; achieving India’s long-term renewable ambitions requires simultaneous investment in new, high-capacity transmission corridors. India’s success will depend on pursuing both tracks together.

  • Fast X-ray Transients (FXTs)

    Why in the news?

    Astronomers from the Indian Institute of Astrophysics have traced the likely origin of a rare Fast X-ray Transient (FXT) event, EP241107a, detected by the Einstein Probe in November 2024.

    Key Findings

    • FXTs are energetic, non-repeating flashes of X-rays lasting from a few minutes to several hours.
    • They are a recently discovered class of transient cosmic events whose origin has remained uncertain.
    • Researchers identified a radio counterpart of FXT EP241107a using the Karl G. Jansky Very Large Array.
    • Follow-up observations were conducted using:
      • Himalayan Chandra Telescope
      • GROWTH India Telescope
      • Upgraded Giant Metrewave Radio Telescope

    Likely Origin

    • The event was probably caused by: Collapse of a massive star leading to a supernova and gamma-ray burst (GRB), or Merger of two neutron stars.
    • Researchers concluded that EP241107a is most likely an “orphan afterglow”:
      • A gamma-ray-burst-like explosion whose gamma rays were not directly detected.
      • Represents a lower-energy member of the GRB population.

    Fast X-ray Transients (FXTs)

    • Sudden flashes of low-energy X-rays.
    • Non-repeating and short-lived.
    • Fade rapidly after detection.
    • Associated with highly energetic cosmic explosions.

    Proposed Sources

    • Core-collapse supernovae.
    • Binary neutron star mergers.
    • Magnetars (highly magnetized neutron stars).
    • Tidal disruption events involving white dwarfs and black holes.
    • Gamma-ray bursts (GRBs).

    Gamma-Ray Bursts (GRBs)

    • Most energetic explosions known in the Universe.
    • Emit intense gamma radiation for a few milliseconds to several minutes.
    • Associated with the collapse of massive stars (Long GRBs) and Neutron star mergers (Short GRBs).
    • Followed by multi-wavelength “afterglows” in X-ray, optical, and radio bands.

    Neutron Star

    • Extremely dense remnant of a massive star after a supernova.
    • Mass ≈ 1.4-2 solar masses compressed into a sphere about 20 km across.
    • Composed mainly of neutrons.

    [2023] Consider the following pairs: Objects in space : Description
    1. Cepheids : Giant clouds of dust and gas in space
    2. Nebulae : Stars which brighten and dim periodically
    3. Pulsars : Neutron stars that are formed when massive stars run out of fuel and collapse
    How many of the above pairs are correctly matched ?

    [A] Only one

    [B] Only two

    [C] All three

    [D] None

  • India’s First Commercial-Scale Coal-to-Ammonium Nitrate Project

    Why in the news?

    The Prime Minister will lay the foundation stone of India’s first commercial-scale Coal-to-Ammonium Nitrate Project at Lakhanpur, Jharsuguda district, Odisha. The project, worth ₹25,016 crore, is a major step towards energy security, import substitution, and industrial self-reliance.

    Coal Gasification

    • A process that converts coal into Synthesis Gas (Syngas), mainly consisting of carbon monoxide (CO) and hydrogen (H₂).
    • Syngas can be used to produce Methanol, Urea, Ammonia, Ammonium Nitrate, Synthetic Natural Gas (SNG), Other chemical feedstocks

    Lakhanpur Project

    • India’s first commercial-scale Coal-to-Ammonium Nitrate facility.
    • Developed by Bharat Coal Gasification and Chemicals Limited, a joint venture of Bharat Heavy Electricals Limited and Coal India Limited.
    • Located on about 350 acres under Mahanadi Coalfields Limited land.
    • Capacity: 2,000 tonnes/day of Ammonium Nitrate.
    • Uses indigenous coal gasification technology developed by BHEL.
    • Receives ₹1,350 crore support under the Coal Ministry’s incentive scheme.

    Significance

    • Reduces dependence on imported natural gas, ammonia, methanol, and chemicals.
    • Supports Aatmanirbhar Bharat and domestic manufacturing.
    • Enhances value addition to India’s vast coal reserves (>400 billion tonnes).
    • Expected to boost downstream chemical and fertilizer industries.

    [2025] Consider the following substances:
    I. Ethanol
    II. Nitroglycerine
    III. Urea
    Coal gasification technology can be used in the production of how many of them?

    [A] Only one

    [B] Only two

    [C] All the three

    [D] None