Green Hydrogen, Electric Vehicles and Battery Technology Notes

Clean energy technology is among the most discussed topics in science and technology today. Green hydrogen, electric vehicles (EVs) and advanced batteries are the three pillars on which India plans to cut its oil imports and meet its goal of net-zero emissions by 2070. For the UPSC, these topics appear in the Prelims as definitions, colours of hydrogen, scheme names and technology terms, and in the Mains as questions on energy security and climate change. This note explains the science in simple language, adds the government policies and gives you a ready Mains structure.

What Is Green Hydrogen?

Hydrogen is the lightest element and a clean fuel, because when it burns or is used in a fuel cell, it gives only water. But hydrogen does not exist freely on Earth. It has to be produced from other compounds, such as water or natural gas, and the method of production decides how clean it is. Green hydrogen is made by splitting water into hydrogen and oxygen with electrolysis, using electricity from renewable sources like solar and wind. The process does not release carbon dioxide.

Colours of Hydrogen

Electrolysers and Fuel Cells

An electrolyser uses electricity to break water. The main types are the alkaline electrolyser, which is mature and cheaper, and the proton exchange membrane (PEM) electrolyser, which is compact and works well with variable renewable power. A fuel cell does the reverse job: it combines hydrogen and oxygen to produce electricity, heat and water. Fuel cells can run buses, trucks, trains and ships.

Uses and Challenges

• Uses: Replacing grey hydrogen in oil refineries and fertiliser plants (ammonia), making green steel, running heavy vehicles and shipping, and storing renewable energy.
• Challenges: High cost of electrolysers and renewable power, storage and transport difficulties (hydrogen must be compressed or cooled to about minus 253 degrees Celsius to be liquid), safety concerns because it is highly flammable, and the need for a large quantity of water.

National Green Hydrogen Mission

The Government approved the National Green Hydrogen Mission in January 2023, with an outlay of about Rs 19,744 crore. Its main aims are to make India a global hub for the production, use and export of green hydrogen and its derivatives, to produce about 5 million tonnes of green hydrogen per year by 2030, and to add large renewable energy capacity for it. The scheme SIGHT (Strategic Interventions for Green Hydrogen Transition) gives incentives for electrolyser manufacturing and for green hydrogen production. The mission also plans green hydrogen hubs, pilot projects in steel, shipping and mobility, and standards and regulations. It is expected to reduce fossil fuel imports, create jobs and cut emissions.

Electric Vehicles: Types and Technology

EVs have fewer moving parts, give high efficiency and produce no exhaust, so they reduce urban air pollution. But their overall benefit depends on how clean the electricity is. The main challenges are the high price of batteries, a shortage of charging stations, long charging times, and the dependence on imported lithium and cobalt. Charging can be slow (AC) or fast (DC), and some companies are testing battery swapping, in which the empty battery is replaced within minutes.

Battery Technology

A battery stores energy in chemical form and releases it as electricity. The lithium-ion battery is the most used battery in phones and EVs, because it has a high energy density and long life. Two common chemistries are NMC (nickel-manganese-cobalt), which has more energy, and LFP (lithium iron phosphate), which is safer, cheaper and free of cobalt. The newer technologies include solid-state batteries (safer and with higher density), sodium-ion batteries (using abundant sodium instead of lithium), and flow batteries for the grid. A Battery Management System (BMS) protects the battery from overheating and overcharging. For the grid, India also uses pumped hydro storage and is building large battery energy storage systems, to balance the supply of solar and wind power.

Government Policies for EVs and Batteries

• FAME (Faster Adoption and Manufacturing of Hybrid and Electric Vehicles): Launched in 2015, with FAME-II in 2019 giving subsidies for EVs and charging stations. Later, the PM E-DRIVE scheme (2024) continued support for electric buses, trucks and two- and three-wheelers.
• PLI schemes: The Production Linked Incentive scheme for Advanced Chemistry Cell (ACC) batteries aims at building a large domestic battery manufacturing capacity, and a PLI scheme for the auto sector supports advanced technology vehicles.
• National Mission on Transformative Mobility and Battery Storage (2019): To promote clean mobility and local manufacturing.
• Battery Waste Management Rules, 2022: Make producers responsible for the collection and recycling of used batteries (Extended Producer Responsibility).
• National Critical Mineral Mission (2025): To secure the supply of lithium, cobalt, nickel and rare earths. Lithium resources have been found in Reasi in Jammu and Kashmir.

Hydrogen Storage and Transport

Because hydrogen has a very low density, storing and moving it is a big technical problem. It can be compressed in high-pressure tanks, liquefied at very low temperature, absorbed in metal hydrides, or converted into carriers like ammonia and methanol, which are easier to ship. Pipelines can carry hydrogen blended with natural gas in small proportions. Some projects in India are testing the blending of green hydrogen into city gas networks, and ports are planned as export hubs for green ammonia. These choices decide the final cost of green hydrogen, which today is higher than that of grey hydrogen, so the mission focuses on cutting cost through scale, local manufacturing and cheaper renewable electricity.

Charging Infrastructure and Grid Storage

For EVs to spread, people need to find chargers as easily as petrol pumps. India is building public charging stations on highways and in cities, and the guidelines allow charging at homes and offices as well. Time-of-day tariffs encourage charging when the grid has surplus solar power. EV batteries can also work as a storage for the grid through the idea of vehicle-to-grid. Large battery energy storage systems and pumped hydro plants store power when the supply is high and release it when the demand is high, which is necessary because solar and wind power are variable. The government has also given a Viability Gap Funding scheme for battery storage projects.

Global Scenario and India's Position

China leads the world in EV sales and in the production of batteries and processing of critical minerals, while Europe and the USA are also growing their markets. Countries like Australia, Chile and the Gulf region are planning large green hydrogen projects. India has strong advantages: abundant sunlight, a large domestic market, a growing manufacturing base and a target of 500 GW of non-fossil power capacity by 2030. Its challenges are high import dependence for batteries and minerals, and the need for low-cost finance. Partnerships with countries through the International Solar Alliance, the Global Biofuels Alliance and bilateral deals are therefore important.

Practice Questions

• Q1. Which hydrogen is produced by electrolysis using renewable electricity? Answer: Green hydrogen.
• Q2. Which type of battery is cobalt-free and safer? Answer: LFP (lithium iron phosphate).
• Q3. What does FCEV stand for? Answer: Fuel Cell Electric Vehicle.

Mains Angle: Can Green Hydrogen and EVs Ensure Energy Security?

Begin with the problem: India imports a large part of its oil and gas, which exposes it to price shocks. Then explain how green hydrogen and EVs can help: they reduce oil dependence, cut emissions, improve air quality, and create new industries. Mention the challenges of cost, infrastructure, critical minerals, the cleanliness of the power grid, and the need for skilled workers. Finish with a way forward: expand renewable power, develop domestic manufacturing of electrolysers and batteries, build charging networks, support recycling and the circular economy, and cooperate internationally. For related topics, read the notes on renewable energy in India.

Quick Revision

• Green hydrogen = electrolysis with renewable power; grey = natural gas; blue = grey with carbon capture.
• National Green Hydrogen Mission (2023): 5 million tonnes per year by 2030; SIGHT scheme.
• BEV, HEV, PHEV, FCEV; LFP is safer and cobalt-free; NMC has higher energy.
• FAME, PM E-DRIVE, PLI ACC battery scheme, Battery Waste Management Rules 2022.

Frequently Asked Questions (FAQ)

What is green hydrogen?

Green hydrogen is hydrogen produced by splitting water through electrolysis using renewable electricity, so it does not release carbon dioxide.

What is grey hydrogen?

Grey hydrogen is produced from natural gas by steam methane reforming and releases carbon dioxide.

What is blue hydrogen?

Blue hydrogen is grey hydrogen produced with carbon capture and storage, so its emissions are low.

What is the target of the National Green Hydrogen Mission?

The mission aims for about 5 million tonnes of green hydrogen production per year by 2030.

What is the SIGHT scheme?

SIGHT (Strategic Interventions for Green Hydrogen Transition) gives incentives for manufacturing electrolysers and producing green hydrogen.

What is a fuel cell?

A fuel cell combines hydrogen and oxygen to produce electricity, heat and water.

What are BEV, HEV, PHEV and FCEV?

They are battery electric, hybrid electric, plug-in hybrid electric and fuel cell electric vehicles.

What is the difference between NMC and LFP batteries?

NMC batteries have a higher energy density but use cobalt and nickel, while LFP batteries are safer, cheaper and cobalt-free.

What is a solid-state battery?

It is a battery that uses a solid electrolyte instead of a liquid, which promises higher safety and energy density.

What is FAME India?

FAME is a scheme to promote the faster adoption and manufacturing of hybrid and electric vehicles in India.

What are the Battery Waste Management Rules, 2022?

They make battery producers responsible for collecting and recycling used batteries under Extended Producer Responsibility.

Why are critical minerals important for EVs?

Lithium, cobalt, nickel and rare earths are needed for batteries and motors, so secure supply is vital for EV manufacturing.