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How Hydrogen Fuel Cells Work
Electrochemical reaction · NOT combustion · H₂ + O₂ → Electricity + Water + Heat
💡 Fuel Cell = A Battery That Keeps Running
A fuel cell works like a battery — but instead of needing recharging, it continuously generates electricity as long as hydrogen fuel is supplied. Unlike a combustion engine (which burns fuel with heat loss), a fuel cell converts chemical energy directly to electrical energy through an electrochemical reaction — similar to how a battery works, but far more efficient. The only by-products are water and heat — zero carbon emissions at the point of use.
🔋 PEM Hydrogen Fuel Cell — How it Works
⊖ ANODE (Negative)
Hydrogen gas (H₂) fed in | Platinum catalyst splits H₂ into 2 protons (H⁺) and 2 electrons (e⁻) | Oxidation half-reaction: H₂ → 2H⁺ + 2e⁻ | Electrons flow through external circuit (= electrical current) | Protons pass through membrane
PEM
Proton Exchange Membrane
Allows only protons (H⁺) to pass through | Blocks electrons → forces them through external circuit | Acts like a selective filter | Made of polymer electrolyte (Nafion)
⊕ CATHODE (Positive)
Oxygen (O₂) from air fed in | Protons from membrane + electrons from circuit combine with O₂ | Reduction half-reaction: O₂ + 4H⁺ + 4e⁻ → 2H₂O | By-products: Pure water + heat | No CO₂ produced at the point of use
⚛️ Overall reaction: 2H₂ + O₂ → 2H₂O + Electricity + Heat | Efficiency: 60–80% (vs 25–40% for combustion engines)
Types of Fuel Cells — UPSC Reference
- PEM Fuel Cell (Proton Exchange Membrane / Polymer Electrolyte Membrane): Most common for vehicles and portable applications | Operates at 60–80°C | Fast startup | Used in Toyota Mirai, NTPC hydrogen buses | Requires platinum catalyst (expensive)
- Alkaline Fuel Cell (AFC): Used in NASA space missions | Very high efficiency (~70%) | Sensitive to CO₂ in air | Requires pure oxygen and hydrogen | Expensive but very reliable
- SOFC (Solid Oxide Fuel Cell): Operates at 750–1000°C | High efficiency | Can reform natural gas directly (internal reforming) | Best for stationary power generation | Long startup time
- Molten Carbonate Fuel Cell (MCFC): Operates at ~650°C | Good for industrial and power plant use | Can use natural gas or biogas | Also captures CO₂
- PAFC (Phosphoric Acid Fuel Cell): Established commercial technology | Hospital and hotel backup power | Operates at 200°C
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The Hydrogen Colour Wheel — 8 Types for UPSC
Hydrogen is colourless — but colours indicate the production method and environmental impact
Key Concept — Why the Colour Coding?
- Hydrogen gas itself is colourless, odourless, and tasteless. The “colour” is just a shorthand for the production method and environmental impact — how the hydrogen was made and how much CO₂ was emitted in the process.
- Currently: ~95% of global hydrogen is “grey” (from fossil fuels without carbon capture) | Only ~1% is “green” | Blue hydrogen is emerging as a transition pathway
- For UPSC: Green, Blue, Grey, Turquoise, and Pink are most important. White hydrogen is emerging as a new UPSC topic.
🟢 Green Hydrogen
Renewable Energy + Electrolysis
Electrolysis of water using 100% renewable electricity (solar, wind, hydro). Zero CO₂ at all stages of production. Most sustainable — the end goal. Current cost: $4–8/kg. India’s NGHM focuses entirely on this. ✅ Zero emissions
🔵 Blue Hydrogen
Natural Gas + SMR + CCS
Steam Methane Reforming (SMR) of natural gas + Carbon Capture and Storage (CCS) to capture CO₂ emissions. “Low-carbon” — not zero carbon. Considered a transitional pathway while green hydrogen scales up. Cost: ~$1.5–2.5/kg. ⬇️ Low-carbon (if CCS works)
⬜ Grey Hydrogen
Natural Gas + SMR (no CCS)
Steam Methane Reforming (SMR) of natural gas — CO₂ released into atmosphere. Most common globally (~95%). Produces 10–19 tonnes of CO₂ per tonne of H₂. Cheapest (~$1–1.5/kg) — hence dominance. Not sustainable. ❌ High emissions
🟦 Turquoise Hydrogen
Methane Pyrolysis
Methane (CH₄) split at high temperature into H₂ + solid carbon (not CO₂ gas). Carbon can be used in manufacturing (tyres, batteries). Still in early development. Colour = “between green and blue” on spectrum. 🔄 Low-emission potential
🩷 Pink/Purple Hydrogen
Nuclear Energy + Electrolysis
Electrolysis powered by nuclear energy (100% nuclear electricity). Also called “purple” or “crimson”. Low carbon (nuclear doesn’t emit CO₂ during operation). Enables continuous production (unlike intermittent renewables). Nuclear waste remains a concern. ⚛️ Low-carbon
🟡 Yellow Hydrogen
Solar Energy + Electrolysis
Electrolysis powered specifically by solar energy. A subset of green hydrogen specific to solar power. Some use “yellow” to mean electrolysis from a grid mix (fossil+renewable). India’s geography makes this promising (abundant solar). ☀️ Low/zero emissions
⚫ Black/Brown Hydrogen
Coal Gasification
Coal gasification — most environmentally damaging. Black = bituminous/hard coal. Brown = lignite. Massive CO₂ emissions, no carbon capture. Historically used but declining. India used this in early industrial hydrogen production. ❌❌ Highest emissions
⬜ White Hydrogen
Natural / Geological
Naturally occurring hydrogen found in subsurface geological deposits — not produced by any industrial process. Formed by reactions between water and iron-rich minerals. Deposits found in Mali (Bourakébougou field), Brazil, Australia. “Drilling for hydrogen” concept emerging. 🌍 Naturally occurring
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Electrolysis — The Technology Behind Green Hydrogen
Three main electrolyser types · Alkaline (most mature) · PEM · SOEC
What is Electrolysis?
- Basic reaction: 2H₂O → 2H₂ + O₂ | Electric current splits water into hydrogen and oxygen | The electricity source determines if the hydrogen is “green”
- Energy requirement: ~55 kWh of electricity per kg of H₂ produced — highly energy intensive
- Key component: Electrolyser — the device that performs electrolysis | SIGHT Programme Component I focuses on domestic electrolyser manufacturing
| Electrolyser Type | Technology | Temp | Efficiency | Status | Best For |
|---|---|---|---|---|---|
| Alkaline Electrolysis (AEL) | KOH solution electrolyte | Mature technology since 1920s | TRL 9 | 60–90°C | 65–70% | Most mature, widely deployed | Lowest cost | Slow response to load changes | Large-scale, steady industrial hydrogen production |
| PEM Electrolysis (Proton Exchange Membrane) | Solid polymer membrane | Compact design | Fast startup | 60–80°C | 65–70%+ | Growing rapidly | Handles variable renewable power well | Requires platinum catalyst (expensive) | Variable RE integration, vehicles, decentralized production |
| SOEC (Solid Oxide Electrolysis) | High-temperature ceramic electrolyte | Can use industrial waste heat | 750–900°C | Up to 85%+ | Emerging | High efficiency with waste heat integration | Limited commercial deployment | Industrial complexes with waste heat availability |
| AEM Electrolysis (Anion Exchange Membrane) | Alkaline environment + polymer membrane hybrid | Avoids platinum catalysts | 40–70°C | ~65% | Emerging | Lower cost potential than PEM | Early commercial stage | Next-gen cost-competitive green hydrogen |
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Advantages & Disadvantages of Hydrogen as Fuel
“Hydrogen is clean — but most of its current production is not”
✅ Advantages of Hydrogen as Fuel
- 1. Zero emissions at point of use: When burned or used in a fuel cell, the only by-product is water vapour. No CO₂, no SOₓ, no NOₓ (unlike fossil fuels). Critical for decarbonizing transport and industry.
- 2. Highest energy density by weight: ~120 MJ/kg — three times more energy per kg than petrol (~44 MJ/kg) and much more than lithium batteries (~0.5 MJ/kg). This makes it attractive for long-range transport (aviation, shipping, trucks) where battery weight is prohibitive.
- 3. Versatile energy carrier: Can be used in fuel cells (electricity), burned in modified combustion engines, blended with natural gas for heating, or used as feedstock (fertilizers, steel, refineries). Serves multiple sectors.
- 4. Grid balancing and energy storage: Green hydrogen can store surplus renewable energy (e.g., excess solar at noon) that would otherwise be wasted. Acts as a long-term, seasonal energy storage medium that batteries cannot match.
- 5. Decarbonizing hard-to-abate sectors: Steel (direct reduced iron using hydrogen), fertilizers (green ammonia replacing Haber-Bosch with grey hydrogen), aviation (SAF/hydrogen), shipping — sectors where electrification is impractical. Indispensable for net-zero 2070 goals.
- 6. Rapid refuelling: Hydrogen vehicles (FCEVs) refuel in 3–5 minutes (vs hours for BEVs). Better for commercial vehicles and long-range applications.
- 7. Energy security: India imports 80%+ of fossil fuels. Green hydrogen can be produced domestically using abundant solar and wind resources — reducing import dependence.
- 8. Export potential: India’s renewable energy advantage could make it a competitive green hydrogen exporter to Europe, Japan, and South Korea — major potential revenue stream.
❌ Disadvantages / Challenges of Hydrogen as Fuel
- 1. Currently mostly “grey” and dirty: ~95% of global hydrogen production uses fossil fuels without CCS. The “hydrogen economy” as it exists today is actually a fossil fuel economy. Only ~1% is green. Scale-up of green hydrogen takes years and massive investment.
- 2. High cost of green hydrogen: Green hydrogen costs $4–8/kg today (grey hydrogen = $1–1.5/kg). Target: bring green hydrogen to $1–2/kg by 2030 (India’s goal). The cost gap is the primary barrier.
- 3. Energy losses in production and conversion: To produce green hydrogen from renewable electricity → use electricity to electrolyse water → compress/store hydrogen → convert back to electricity in fuel cell: overall efficiency is only 25–40%. Compare with direct battery storage: 85–95% round-trip efficiency. H₂ has significant “well-to-wheel” losses.
- 4. Storage challenges: Hydrogen must be stored at either: very high pressure (700 bar for vehicles) or very low temperature (−253°C as liquid hydrogen — cryogenic). Both are energy-intensive and expensive. Low volumetric energy density (even compressed) means large storage tanks.
- 5. Safety concerns: Hydrogen is highly flammable (flammability range: 4–75% in air — much wider than methane at 5–15%). Colourless and odourless — cannot be easily detected. Leaks can accumulate and cause explosions. Special materials and infrastructure needed to prevent hydrogen embrittlement of metals.
- 6. Hydrogen leakage as a greenhouse gas: Leaked hydrogen itself can act as an indirect greenhouse gas (reacts with OH radicals in atmosphere, depleting them, which prolongs methane lifetime). Even “clean” green hydrogen systems can contribute to warming if not leak-proof.
- 7. Infrastructure gap: Hydrogen requires entirely new infrastructure — pipelines, refuelling stations, storage tanks, fuel cells in vehicles. Blending into existing natural gas pipelines has limits (~10–20% by volume before material degradation). Transition costs are enormous.
- 8. Water consumption: Green hydrogen requires freshwater for electrolysis (~9 kg water per kg H₂) — a concern in water-stressed regions. India’s western and Deccan regions have water scarcity issues. Seawater electrolysis is being researched but not commercially viable yet.
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National Green Hydrogen Mission (NGHM)
Cabinet approved January 4, 2023 · MNRE nodal ministry · ₹19,744 crore · 5 MMT/year by 2030
NGHM — Complete Framework
- First announced: PM Narendra Modi’s Independence Day speech — August 15, 2021
- Budget 2021-22: National Hydrogen Mission (NHM) announced by Finance Minister
- Cabinet approval: January 4, 2023 (Union Cabinet chaired by PM Modi) | Approved as NGHM specifically focused on Green Hydrogen
- Nodal Ministry: Ministry of New and Renewable Energy (MNRE)
- Initial outlay: ₹19,744 crore (until FY 2029-30) | FY 2024-25 outlay: ₹600 crore
- Phase I (2022-23 to 2025-26): Create demand + supply through incentivising electrolyser production | Deployment in refineries, fertilizers, city gas | Pilot projects in steel, mobility, shipping | Regulatory frameworks
- Phase II (2026-27 to 2029-30): Green hydrogen cost-competitive with fossil fuels | Commercial-scale projects in steel, mobility, shipping, aviation, railways | Intensified R&D | Deep decarbonisation
NGHM Targets by 2030
| Target / Outcome | Details |
|---|---|
| Green Hydrogen production capacity | At least 5 MMT (Million Metric Tonnes) per annum | India to become a global production hub |
| Renewable Energy addition | Associated ~125 GW of RE capacity addition to power electrolysers |
| Investment leveraged | Over ₹8 lakh crore in total investments in green hydrogen industry |
| Jobs created | Over 6,00,000 (6 lakh) jobs by 2030 |
| GHG emission reduction | Nearly 50 MMT of annual CO₂ reduction by 2030 |
| Fossil fuel imports reduced | Cumulative reduction of over ₹1 lakh crore in fossil fuel imports |
| Green hydrogen cost target | Reduce cost to ₹150/kg (~$1.8/kg) — cost-competitive with grey hydrogen | Currently ₹330–500/kg ($4–8/kg) |
NGHM Key Components
SIGHT Programme
₹17,490 crore — largest component
Strategic Interventions for Green Hydrogen Transition
Two mechanisms:
• Component I: Incentives for domestic electrolyser manufacturing — build India’s electrolyser industry
• Component II: Incentives for green hydrogen production — including green ammonia (₹50/kg incentive, decreasing annually)
Aims to drive down costs through scale and competition.
Two mechanisms:
• Component I: Incentives for domestic electrolyser manufacturing — build India’s electrolyser industry
• Component II: Incentives for green hydrogen production — including green ammonia (₹50/kg incentive, decreasing annually)
Aims to drive down costs through scale and competition.
Pilot Projects
₹1,466 crore
• Steel decarbonisation (₹455 cr for low-carbon steel)
• Mobility pilot projects (₹496 cr) — hydrogen buses, trucks, FCEV
• Shipping — green methanol/ammonia bunkering
• Decentralised energy applications
• Hydrogen production from biomass
• Hydrogen storage projects
• 37 hydrogen buses/trucks on 10 routes — large-scale trial
• Mobility pilot projects (₹496 cr) — hydrogen buses, trucks, FCEV
• Shipping — green methanol/ammonia bunkering
• Decentralised energy applications
• Hydrogen production from biomass
• Hydrogen storage projects
• 37 hydrogen buses/trucks on 10 routes — large-scale trial
R&D — SHIP
₹400 crore
Strategic Hydrogen Innovation Partnership (SHIP) — Public-Private Partnership framework for R&D
• Government institutions (BARC, ISRO, CSIR, IITs) + private industry
• 23 cutting-edge projects in production, storage, safety
• ₹100 crore Call for Proposals for startups
• Hydrogen Valley Innovation Clusters (DST initiative)
• Government institutions (BARC, ISRO, CSIR, IITs) + private industry
• 23 cutting-edge projects in production, storage, safety
• ₹100 crore Call for Proposals for startups
• Hydrogen Valley Innovation Clusters (DST initiative)
Green H₂ Hubs
₹400 crore + ports
3 major coastal hubs identified (Oct 2025):
• Deendayal Port (Kandla, Gujarat)
• Paradip Port (Odisha)
• V.O. Chidambaranar Port (Tuticorin, Tamil Nadu)
Green ammonia + methanol bunkering facilities for shipping export corridor
• Deendayal Port (Kandla, Gujarat)
• Paradip Port (Odisha)
• V.O. Chidambaranar Port (Tuticorin, Tamil Nadu)
Green ammonia + methanol bunkering facilities for shipping export corridor
GHCI Certification
April 2025 — BEE nodal
Green Hydrogen Certification Scheme India (GHCI)
• Standard: ≤2 kg CO₂eq per kg H₂
• Mandatory for govt subsidy recipients + domestic sellers
• BEE accredits Carbon Verification agencies
• Concept certificate (voluntary) + Final certificate (mandatory)
• Certificates may become tradable in India’s carbon market (2026)
• Standard: ≤2 kg CO₂eq per kg H₂
• Mandatory for govt subsidy recipients + domestic sellers
• BEE accredits Carbon Verification agencies
• Concept certificate (voluntary) + Final certificate (mandatory)
• Certificates may become tradable in India’s carbon market (2026)
Policy Enablers
Multiple provisions
• Waiver of interstate transmission charges for RE used in H₂ production
• Open Access + grid connectivity time-bound grant
• RE banking facilitation
• Green ammonia allocation for fertiliser sector (increased from 5.5 to 7.5 lakh tonnes)
• Standards for green ammonia + green methanol notified
• Open Access + grid connectivity time-bound grant
• RE banking facilitation
• Green ammonia allocation for fertiliser sector (increased from 5.5 to 7.5 lakh tonnes)
• Standards for green ammonia + green methanol notified
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India’s Key Steps in Hydrogen Economy
GAIL · NTPC · Oil India · SECI · Pilot projects · International partnerships
2021 — Independence Day Announcement
PM Modi announces National Hydrogen Mission from Red Fort — signals India’s commitment to hydrogen as a pillar of clean energy transition.
Jan 2023 — NGHM Cabinet Approval
Union Cabinet approves NGHM with ₹19,744 crore outlay | Target: 5 MMT green hydrogen/year by 2030 | MNRE as nodal ministry | SIGHT programme launched.
Jan 2023 — GAIL maiden blending project (Indore)
GAIL Limited starts India’s maiden project of blending hydrogen in City Gas Distribution (CGD) grid in Indore, Madhya Pradesh — first commercial-scale hydrogen blending in Indian piped gas network.
Jan 2023 — NTPC PNG blending (Surat)
NTPC initiates blending of Green Hydrogen up to 8% (vol/vol) in PNG (Piped Natural Gas) Network at NTPC Kawas Township, Surat, Gujarat.
2023 — NTPC FCEV buses (Greater Noida)
NTPC launches Hydrogen-based Fuel-Cell Electric Vehicle (FCEV) buses in Greater Noida — India’s first hydrogen bus demonstration project in a major city.
2024 — NTPC world’s highest GH project (Leh)
NTPC commissions the world’s highest altitude Green Hydrogen Mobility Project at Leh, Ladakh (3,650 metres above sea level) — 5 intra-city FCEV buses + hydrogen fuelling station. Proves H₂ technology works in extreme cold conditions.
2024 — Oil India 60kW fuel cell bus
Oil India develops a 60-kW hydrogen fuel cell bus (hybrid of electric drive + fuel cell) — India’s first indigenous hydrogen bus demonstration. Also: 37 hydrogen buses/trucks launched on 10 pilot routes nationwide.
2024 — World Hydrogen Summit (Rotterdam)
India debuts with its 1st India Pavilion at the World Hydrogen Summit 2024 in Rotterdam, Netherlands — signals global investment readiness and India’s intent to attract international green hydrogen capital.
Nov 2024 — SECI–H2Global MoU (Germany)
India’s Solar Energy Corporation of India (SECI) signs MoU with H2Global Stiftung (Germany) — to design market-based mechanisms and enable export of Indian green hydrogen to Europe.
Feb 2025 — India–UK Standards Partnership
India and UK hold a dedicated Standards Partnership Workshop to harmonize Regulations, Codes, and Standards (RCS) for safe and scalable hydrogen trade — critical for export market credibility.
April 2025 — GHCI launched
Green Hydrogen Certification Scheme of India (GHCI) launched by MNRE | BEE as nodal authority | ≤2 kg CO₂eq/kg H₂ standard | Mandatory for subsidy recipients + domestic sellers. India’s first official green hydrogen quality certification system.
Oct 2025 — Green H₂ Hubs + Singapore MoUs
Three Green Hydrogen Hubs officially identified: Deendayal (Kandla), Paradip, V.O. Chidambaranar (Tuticorin) | Sembcorp Industries (Singapore) signs MoUs with Paradip and Tuticorin port authorities to build green H₂+ammonia production, storage, export hubs.
🔴 Current Affairs Summary 2024–2025 — At a Glance UPSC 2026
- GHCI (April 2025): Green Hydrogen Certification Scheme India | BEE nodal authority | ≤2 kg CO₂eq/kg H₂ | Mandatory for subsidised/domestic producers | Concept certificate (voluntary) + Final certificate (mandatory)
- NTPC Leh project (2024): World’s highest altitude (3,650m) green hydrogen mobility project | 5 FCEV intra-city buses + fuelling station
- 37 hydrogen bus/truck pilots (2024-25): Large-scale mobility trials on 10 routes across India — road mobility demonstration
- 3 Green Hydrogen Hubs (Oct 2025): Kandla (Gujarat) + Paradip (Odisha) + Tuticorin (Tamil Nadu) — coastal export hubs
- Sembcorp-India MoU (Oct 2025): Singapore’s Sembcorp industries + Paradip + Tuticorin ports — green H₂+ammonia bunkering hub
- SECI–H2Global MoU (Nov 2024): Germany partnership for green hydrogen export market mechanisms
- India–UK Standards Workshop (Feb 2025): Harmonizing regulations for hydrogen trade
- Green ammonia allocation increased: MNRE increased green ammonia for fertiliser sector from 5.5 to 7.5 lakh tonnes/year
- EU–India: 30+ joint proposals on hydrogen from waste under Trade and Technology Council
- R&D allocations: ₹400 crore for 23 research projects | ₹100 crore startup fund | DST Hydrogen Valley Innovation Clusters
- Coastal Green Shipping Corridor: V.O. Chidambaranar and Deendayal ports developing green methanol/hydrogen bunkering for shipping decarbonisation
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Hydrogen in Hard-to-Decarbonize Sectors & Challenges
Steel · Fertilizers · Mobility · Shipping · Challenges India faces
Hard-to-Abate Sectors — Why Hydrogen is Essential
- Steel: Currently uses metallurgical coal (coke) as reducing agent. Green hydrogen can directly reduce iron ore (Direct Reduced Iron — DRI/H₂-DRI) without coal. NGHM: ₹455 cr for low-carbon steel pilots. Decarbonizing steel = huge CO₂ impact (steel = ~8% of global CO₂)
- Fertilizers (Ammonia): India imports LNG to produce ammonia for urea. Green ammonia (H₂ + N₂ using renewable energy) can replace this. India is the world’s 2nd largest fertilizer consumer — green ammonia reduces import dependence dramatically.
- Oil Refining: Refineries use large amounts of grey hydrogen for desulphurization. Replacing with green hydrogen is a near-term use case with existing infrastructure.
- Mobility (Long-distance): FCEVs for trucks, buses, trains (where BEV range or weight is a problem). Railway: NTPC’s hydrogen-powered trains (Leh project). Aviation: Hydrogen-powered aircraft (long-term). India: 37 buses/trucks in pilot trials.
- Shipping: Green methanol and green ammonia as marine fuels — India developing “Coastal Green Shipping Corridor” | NGHM allocated ₹496 cr for mobility+shipping pilots
- Grid Balancing: Store surplus solar/wind as hydrogen → use in fuel cells during demand peaks. Long-duration storage solution beyond batteries.
Challenges India Faces in the Green Hydrogen Transition
- Cost gap: Green H₂ costs ₹330–500/kg | Grey H₂ = ~₹70-90/kg | Even with incentives, the gap is huge. India’s incentives (₹50/kg under SIGHT) are low compared to US ($3/kg IRA credit) and EU (~€4/kg)
- Electrolyser manufacturing: India lacks domestic electrolyser manufacturing scale — still dependent on imports. SIGHT Component I aims to change this.
- Water availability: Large-scale electrolysis requires 9 litres of freshwater per kg H₂ — concern in water-stressed regions of India
- Infrastructure: No hydrogen pipeline network, very few refuelling stations, no standards for transport until recently
- Funding insufficiency: NGHM’s ₹5,400 crore for production represents only ~40% of what’s needed | Inadequate compared to US ($8 billion hydrogen hubs) and EU (€4/kg support)
- Safety regulations: India still developing safety codes and regulations for hydrogen — GHCI is a first step but more needed
- Demand creation: Until green hydrogen is cost-competitive, industries won’t shift voluntarily — government mandates and carbon pricing needed
⭐ Hydrogen Economy — Complete Cheat Sheet
- Fuel Cell: Electrochemical (not combustion) | H₂ + O₂ → Electricity + Water + Heat | Anode: H₂ → 2H⁺ + 2e⁻ | Membrane: only protons pass | Cathode: O₂ + 4H⁺ + 4e⁻ → 2H₂O | Efficiency: 60-80% (vs 25-40% combustion) | Types: PEM (vehicles), AFC (spacecraft), SOFC (stationary high-temp)
- Electrolysis: 2H₂O → 2H₂ + O₂ | ~55 kWh/kg H₂ | Types: AEL (mature, TRL9, KOH electrolyte), PEM (polymer membrane, compact, fast response, handles variable RE), SOEC (750-900°C, highest efficiency with waste heat), AEM (emerging, avoids platinum)
- Colour Wheel: Green = RE+electrolysis (zero emissions) | Blue = natural gas+SMR+CCS (low carbon) | Grey = SMR no CCS (95% of global production, dirty) | Turquoise = methane pyrolysis → solid carbon | Pink/Purple = nuclear+electrolysis | Yellow = solar+electrolysis | Black = coal gasification (dirtiest) | White = geological/natural hydrogen
- NGHM: Announced Independence Day 2021 | Budget 2021-22 NHM | Cabinet approved January 4, 2023 | MNRE nodal ministry | ₹19,744 crore outlay | Target: 5 MMT/year by 2030 + 125 GW RE + ₹8 lakh crore investment + 6 lakh jobs + 50 MMT CO₂ reduction + ₹1 lakh crore fossil import reduction | Phase I 2022-2025-26 | Phase II 2026-2030
- SIGHT Programme: ₹17,490 crore | Component I = electrolyser manufacturing incentives | Component II = green H₂ production incentives (₹50/kg initially, decreasing) | Including green ammonia incentives (SIGHT Component II for fertiliser sector)
- SHIP: Strategic Hydrogen Innovation Partnership | PPP framework for R&D | BARC+ISRO+CSIR+IITs + private industry | ₹400 crore for 23 projects | ₹100 crore startup fund
- GHCI (April 2025): Green Hydrogen Certification Scheme India | MNRE launches | BEE = nodal authority | Standard: ≤2 kg CO₂eq per kg H₂ | Mandatory for subsidy recipients + domestic sellers | Concept certificate (voluntary) + Final certificate (mandatory) | Future: tradable in India’s carbon market (2026)
- 3 Green H₂ Hubs (Oct 2025): Deendayal Port (Kandla, Gujarat) + Paradip Port (Odisha) + V.O. Chidambaranar Port (Tuticorin, TN) | Export corridor + coastal green shipping corridor
- India’s pilots: GAIL = city gas blending Indore (maiden project) | NTPC = 8% PNG blending Kawas Surat Jan 2023 | NTPC = world’s highest altitude GH project Leh 3650m 2024 (5 FCEV buses) | NTPC = FCEV buses Greater Noida | Oil India = 60kW FCEV bus hybrid | 37 hydrogen buses/trucks pilot 10 routes
- International: SECI-H2Global MoU Nov 2024 (Germany, export mechanisms) | India-UK Standards Workshop Feb 2025 | Sembcorp-India MoU Oct 2025 (Singapore, Paradip+Tuticorin) | World Hydrogen Summit 2024 India Pavilion Rotterdam | EU-India 30+ proposals hydrogen from waste
- Key facts: 95% global H₂ = grey (dirty) | 1% = green | India produces ~6 MMT grey H₂/year (mostly refineries+fertilizers) | Green H₂ cost today: $4-8/kg | Target 2030: $1-2/kg | NGHM links to: NDC targets (45% emission intensity reduction, 50% non-fossil power by 2030) | Net Zero 2070
- UPSC sectors: H₂ decarbonizes hard-to-abate sectors: Steel (H₂-DRI replaces coking coal) | Fertilizers (green ammonia = H₂+N₂) | Refining (grey→green H₂) | Mobility (FCEVs: 3-5 min refuel, long range) | Shipping (green methanol/ammonia bunkering) | Grid storage (seasonal RE storage)
🧪 Practice MCQs
Q1. Consider the following statements about Green Hydrogen:
1. Green hydrogen is produced by electrolysis of water using electricity from renewable energy sources only.
2. The only by-products of using hydrogen in a fuel cell are water and heat — no CO₂ is emitted.
3. Currently, more than 90% of global hydrogen production is from fossil fuels without carbon capture.
4. The Green Hydrogen Certification Scheme India (GHCI) was launched in April 2025 and requires hydrogen to have emission intensity of ≤2 kg CO₂ equivalent per kg of H₂.
Select ALL correct statements:
✅ Answer: (d) All four are correct
1 ✅ Green hydrogen = renewable energy + electrolysis: By definition, green hydrogen is produced by splitting water (H₂O → H₂ + O₂) using electricity generated entirely from renewable energy sources — solar, wind, hydro, geothermal. If the electricity comes from a mixed grid (partially fossil fuel), the hydrogen is sometimes called “yellow” (solar) or is not certified as “green.” The key criterion in GHCI is ≤2 kg CO₂eq/kg H₂ across the entire production lifecycle. 2 ✅ Fuel cell by-products = water + heat only: In a hydrogen fuel cell, the electrochemical reaction is H₂ + ½O₂ → H₂O. The only chemical by-product is pure water. Heat is also produced as a by-product of the reaction. There is zero CO₂ emitted at the point of use. This is what makes hydrogen fuel cells attractive for zero-emission vehicles and power generation. (Note: CO₂ may have been emitted during hydrogen production if it was grey or blue hydrogen — but at the point of use in the fuel cell, there is no CO₂.) 3 ✅ 95% global H₂ is grey (from fossil fuels without CCS): Steam methane reforming of natural gas (SMR) and coal gasification produce grey and black/brown hydrogen respectively. Together these account for ~95% of global hydrogen production. This is produced without carbon capture — releasing 10-19 tonnes of CO₂ per tonne of H₂ for grey hydrogen. Only ~1% of global hydrogen is currently green. This is the most important context for understanding why “hydrogen economy” is still largely a fossil fuel industry today. 4 ✅ GHCI April 2025, ≤2 kg CO₂eq/kg H₂: The Government of India launched the Green Hydrogen Certification Scheme of India (GHCI) in April 2025 under MNRE. BEE (Bureau of Energy Efficiency) is the nodal authority. The scheme defines “green” hydrogen as having emission intensity of ≤2 kg CO₂ equivalent per kg of H₂ across the production lifecycle. Facilities receiving government subsidies or selling hydrogen domestically must obtain a Final Certificate. Concept certificates are voluntary for early-stage producers.
Q2. Consider the following about India’s National Green Hydrogen Mission (NGHM):
1. NGHM was approved by the Union Cabinet in January 2023, with an initial outlay of ₹19,744 crore.
2. The Mission’s SIGHT programme has two components — one for electrolyser manufacturing and one for green hydrogen production.
3. The Mission aims to develop at least 5 MMT per annum green hydrogen production capacity by 2030.
4. The Ministry of New and Renewable Energy (MNRE) is the nodal ministry for implementing NGHM.
Select ALL correct statements:
✅ Answer: (d) All four are correct — core NGHM facts
All four statements are factual and represent core knowledge about India’s National Green Hydrogen Mission. 1 ✅ Cabinet approval January 4, 2023: The Union Cabinet chaired by PM Narendra Modi approved the NGHM on January 4, 2023, with an initial outlay of ₹19,744 crore extending to FY 2029-30. The Mission was first announced on August 15, 2021 (Independence Day) and included in Budget 2021-22 as the National Hydrogen Mission (NHM) — but formal Cabinet approval with full outlay came in January 2023. 2 ✅ SIGHT programme — two components: The Strategic Interventions for Green Hydrogen Transition (SIGHT) programme is the largest component of NGHM (₹17,490 crore). It has two distinct financial incentive mechanisms: Component I targets domestic manufacturing of electrolysers (to build India’s electrolyser industry), and Component II targets the production of green hydrogen (including green ammonia with ₹50/kg incentive decreasing annually). 3 ✅ 5 MMT/year by 2030: India aims to produce at least 5 MMT (million metric tonnes) of green hydrogen per annum by 2030. Associated with this: ~125 GW of renewable energy capacity addition, over ₹8 lakh crore in investments, 6 lakh jobs, 50 MMT annual CO₂ reduction, and ₹1 lakh crore reduction in fossil fuel imports. 4 ✅ MNRE is nodal ministry: The Ministry of New and Renewable Energy (MNRE) is the nodal ministry for implementing NGHM. MNRE formulates scheme guidelines for each component. BEE (under Ministry of Power) oversees the certification scheme (GHCI).
📜 UPSC PYQs — Hydrogen (2023)
With reference to green hydrogen, consider the following statements:
1. It can be used directly as a fuel for internal combustion.
2. It can be blended with natural gas and used as a fuel for heat or power generation.
3. It can be used in the hydrogen fuel cell to run vehicles.
How many of the above statements are correct?
(a) Only one (b) Only two (c) All three (d) None
✅ Official Answer: (c) All three statements are correct
This PYQ directly tests the versatility of green hydrogen — all three use cases are valid. 1 ✅ Internal combustion (ICE): Hydrogen CAN be used directly as a fuel in internal combustion engines — modified ICE engines can burn hydrogen. BMW and Toyota have experimented with hydrogen ICE vehicles. The combustion produces mostly water vapour + some NOₓ (due to high temperatures). India’s NTPC and Oil India have been exploring hydrogen ICE applications. While fuel cells are more efficient, ICE offers a lower-cost adaptation pathway using existing engine technology. 2 ✅ Blending with natural gas: Hydrogen can be blended into existing natural gas pipelines and burned for heating or power generation. India’s GAIL has done this in Indore (maiden project) and NTPC has blended 8% hydrogen in PNG in Surat. Typical safe blending ranges: 5–20% by volume without major infrastructure modifications. Beyond ~20%, special pipelines and appliances are needed. Blending reduces the carbon intensity of gas supply — a near-term use case. 3 ✅ Hydrogen fuel cells for vehicles: Hydrogen fuel cells produce electricity electrochemically from H₂ + O₂ → H₂O + electricity. This electricity drives electric motors — making FCEVs (Fuel Cell Electric Vehicles). NTPC runs hydrogen buses in Leh and Greater Noida. Toyota Mirai, Hyundai Nexo are commercial FCEVs globally. India is testing FCEVs. FCEVs offer: 3-5 minute refuelling (vs hours for BEVs), longer range for heavy vehicles, zero emissions at point of use.
Consider the following heavy industries:
1. Cement industry
2. Fertiliser industry
3. Iron and steel industry
How many of the above industries are expected to be significantly decarbonised by the use of green hydrogen as a source of energy?
(a) Only one (b) Only two (c) All three (d) None
✅ Official Answer: (c) All three can be significantly decarbonised
This question tests whether students understand hydrogen’s role in heavy industry — three of the “hardest-to-decarbonize” sectors globally. 1 ✅ Cement industry: Cement production is extremely carbon-intensive — CO₂ comes from both energy use and the chemical calcination of limestone (CaCO₃ → CaO + CO₂). Green hydrogen can replace fossil fuels as the energy source for high-temperature kilns (~1450°C). Hydrogen can decarbonize the energy component (~40% of emissions). The process emissions from calcination (~60%) require CCUS — a combination approach. Green hydrogen alone doesn’t fully solve cement, but it’s a significant decarbonization tool for the energy part. 2 ✅ Fertilizer industry: The Haber-Bosch process produces ammonia (N₂ + 3H₂ → 2NH₃) — which is the basis of nitrogen fertilizers (urea, ammonium nitrate). Currently, ~95% of hydrogen used is grey (from natural gas). Replacing with green hydrogen → “green ammonia” → decarbonized fertilizers. India imports LNG for ammonia production. The NGHM specifically includes incentives for green ammonia under SIGHT Component II. India has increased green ammonia allocation for fertilizer sector. This is a major near-term decarbonization pathway for India. 3 ✅ Iron and Steel industry: Traditional steelmaking uses blast furnaces where coking coal (carbon) reduces iron ore (Fe₂O₃ + 3C → 2Fe + 3CO₂). Green hydrogen can replace carbon as the reducing agent: Fe₂O₃ + 3H₂ → 2Fe + 3H₂O — this is called Hydrogen-Based Direct Reduced Iron (H₂-DRI) or “green steel.” The only by-product is water. NGHM has ₹455 crore specifically for low-carbon steel pilot projects. SSAB (Sweden), Thyssenkrupp (Germany), and Tata Steel (Netherlands) are advancing green steel globally.
This is a classic UPSC Mains analytical question that requires comparing the two dominant zero-emission vehicle technologies. FCEVs (Hydrogen Fuel Cell Electric Vehicles): Generate electricity on-board from hydrogen + oxygen in a fuel cell → drives electric motor → emits only water vapour. Examples: Toyota Mirai, Hyundai Nexo, NTPC’s hydrogen buses (Leh, Noida). Advantages: Fast refuelling (3–5 minutes, like petrol), Very long range (500–700 km per tank), Better suited for heavy/long-distance transport (trucks, buses, trains, ships), No range anxiety on highways. Disadvantages: Hydrogen infrastructure (refuelling stations) barely exists, Green hydrogen cost is high ($4–8/kg), Overall energy efficiency lower than BEVs (hydrogen production → compression → transport → fuel cell = 25–35% well-to-wheel vs BEV’s 75–85%), High vehicle cost. BEVs (Battery Electric Vehicles): Store electricity in lithium-ion/solid-state batteries → drives electric motor → zero tailpipe emissions. Examples: Tata Nexon EV, Mahindra XEV, Hyundai Ioniq. Advantages: Higher energy efficiency (75–85% well-to-wheel), Existing charging infrastructure growing rapidly in India, Lower operational costs, Better for short-to-medium distance urban use, Battery costs falling rapidly (learning curve). Disadvantages: Long charging time (30 min–8 hours), Range anxiety (especially in rural India), Battery weight becomes impractical for heavy trucks/ships, Limited range in extreme cold (e.g., Ladakh — batteries lose efficiency), Battery manufacturing requires lithium, cobalt (supply chain geopolitics). For India specifically: There is no single “better” — both have complementary roles. BEVs are better for urban personal mobility and last-mile delivery. FCEVs are better for long-haul trucks (Rajasthan to Mumbai), intercity buses (Bangalore-Chennai), trains (Leh–Manali), shipping (coastal vessels). India’s government is pursuing both: FAME scheme for BEVs, NGHM for hydrogen FCEVs. The NTPC Leh project shows FCEVs can function in extreme cold (-30°C) where BEVs struggle — highly relevant for India’s northern borders. India’s choice will likely be BEVs for cities + FCEVs for heavy transport + hydrogen for industrial decarbonization (steel, fertilizers) — a multi-pathway approach.
Legacy IAS — UPSC Civil Services Coaching, Bangalore |
Sources: PIB official — NGHM Cabinet approval Jan 4, 2023 (₹19,744 crore, 5 MMT, 125 GW RE, 6 lakh jobs, 50 MMT CO₂); MNRE official NGHM portal (SIGHT ₹17,490 crore, SHIP, pilot projects); Drishti IAS — NGHM + Unlocking Green Hydrogen Production Potential; Shankar IAS Parliament — NGHM 2025 (GHCI April 2025, NTPC Leh 3650m, 37 buses, Sembcorp Oct 2025); Vision IAS — GHCI April 2025 (BEE nodal, ≤2 kg CO₂eq/kg H₂, Concept+Final certificate); PIB — Leopard Population Report Status; KP IAS Academy — NGHM 2025 (coastal shipping corridor, 3 hubs Oct 2025); Kang Global Studies CA — GHCI (BEE, tradable in carbon market 2026); Vajiram & Ravi — NGHM (Phase I+II); UPSCprep — Hydrogen colour wheel; Enapter — Hydrogen colours explained; Belfer Center — Colors of Hydrogen; CIC energiGUNE — Hydrogen production methods; ScienceDirect — Green/Blue/Turquoise H₂ review (PEM/AEL efficiency, projected $1.5-2/kg by 2030); UPSC PYQs 2023 (green hydrogen direct use, heavy industry decarbonization).
