Coal gasification is a process in which coal is converted into syngas or synthesis gas by reacting it with oxygen, steam or air under high temperature and controlled conditions.
Syngas mainly contains:
- carbon monoxide
- hydrogen
- carbon dioxide
- methane
- water vapour and other trace gases
This syngas can be used to produce electricity, fertilisers, methanol, ammonia, hydrogen, synthetic natural gas and chemicals.
Unlike direct coal burning, coal gasification converts coal into a more flexible gaseous form that can be used as an industrial feedstock.
How It Works
In ordinary coal combustion, coal is burnt directly in the presence of excess oxygen to produce heat and carbon dioxide.
In coal gasification, coal is not completely burnt. It is partially oxidised in a gasifier under controlled conditions. This produces syngas, which can then be cleaned and used for different industrial purposes.
The basic process involves:
- coal preparation and crushing
- feeding coal into a gasifier
- reaction with oxygen/steam/air
- production of syngas
- cleaning of syngas to remove impurities
- conversion of syngas into chemicals, fuels or power
Major Products
Coal gasification can produce several industrially useful products.
- Methanol: used in chemicals, fuels, paints, plastics and blending applications.
- Ammonia: used mainly for fertiliser production.
- Urea: important for India’s fertiliser security.
- Hydrogen: can be used in refining, chemicals and future clean-energy applications.
- Synthetic Natural Gas: can partly substitute imported natural gas.
- Power: syngas can be used in gas turbines or integrated gasification combined cycle systems.
- Chemicals: syngas can be used for producing various petrochemical substitutes.
India’s Policy Push
India has large coal reserves but imports significant quantities of natural gas, methanol, ammonia and fertilisers. Coal gasification is being promoted to convert domestic coal into value-added products and reduce import dependence.
The Government has set a national target of gasifying 100 million tonnes of coal by 2030. This target is part of the National Coal Gasification Mission. The Ministry of Coal has repeatedly linked this target with energy security, import reduction and cleaner use of coal.
In January 2024, the Government approved an ₹8,500 crore financial incentive scheme for promotion of coal and lignite gasification projects in the public and private sectors.
In May 2026, the Union Cabinet approved a much larger ₹37,500 crore scheme to promote surface coal and lignite gasification projects. The scheme aims to accelerate India’s coal gasification programme and support the target of gasifying 100 MT of coal by 2030. It also seeks to reduce dependence on imports of LNG, urea, ammonia and methanol.
Why India Is Promoting Coal Gasification
India’s coal gasification push is driven by economic, strategic and industrial reasons.
- Import reduction: India imports more than half of its LNG requirement, around one-fifth of its urea, almost all ammonia and a large share of methanol. Coal gasification can help reduce these imports.
- Use of domestic coal: India has large coal reserves, but much of it is high-ash coal. Gasification provides a route to use domestic coal for chemicals and fuels.
- Fertiliser security: Syngas can be converted into ammonia and urea, reducing dependence on imported fertilisers and feedstock.
- Chemical industry support: Methanol and other chemicals produced from syngas can support domestic manufacturing.
- Energy security: It provides an alternative feedstock during global LNG or oil-market disruptions.
- Coal sector diversification: As global energy systems shift, gasification allows coal-bearing regions to move beyond direct combustion.
Environmental Claims
Coal gasification is often described as a cleaner way of using coal compared with direct burning because pollutants can be removed from syngas before use.
Potential environmental advantages include:
- lower particulate emissions compared with direct coal combustion
- easier removal of sulphur and other impurities from syngas
- possibility of carbon capture from concentrated gas streams
- production of cleaner industrial feedstock
- reduced local air pollution if properly managed
However, coal gasification is not automatically clean. Its environmental performance depends on technology, emissions control, water management and carbon handling.
Major Concerns
Coal gasification has several serious concerns.
- High carbon emissions: Since coal remains the feedstock, the process can generate significant carbon dioxide unless carbon capture is used.
- Water intensity: Gasification requires large amounts of water, which is a concern in coal-rich but water-stressed regions.
- High cost: Coal gasification plants require large capital investment and advanced technology.
- Technology risk: India has limited commercial-scale experience with large coal gasification projects using high-ash domestic coal.
- Pollution risk: Poorly managed plants can create wastewater, ash, slag, tar and chemical pollution.
- Lock-in risk: Large investments in coal-based infrastructure may slow transition to renewable energy if not carefully planned.
- Land and community impact: Large coal-linked projects can increase land acquisition, mining pressure and local ecological stress.
Coal Gasification and Climate Debate
Coal gasification sits in a difficult position within the climate debate. On one side, it can reduce imports and produce industrial feedstock from domestic resources. On the other side, it continues dependence on coal, which is the most carbon-intensive fossil fuel.
For this reason, coal gasification cannot be treated as a substitute for renewable energy. It should be treated as a transitional industrial strategy, especially for sectors where India currently depends on imported gas, methanol, ammonia and fertilisers.
Its climate acceptability will depend on:
- carbon capture and storage/use
- high-efficiency gasification technology
- water recycling
- strict emissions norms
- lifecycle carbon accounting
- limiting use to strategic industrial sectors
Link with Fertiliser Sector
Coal gasification can be used to produce ammonia, which is further used to manufacture urea. This is important because India is a major consumer of urea and depends partly on imports.
Coal-based fertiliser production can help reduce import dependence, but it must be balanced with environmental safeguards because fertiliser plants are energy-intensive and carbon-intensive.
Link with Methanol Economy
Coal gasification can also produce methanol. Methanol can be used as a chemical feedstock, transport fuel blend, cooking fuel and industrial fuel.
India imports a large part of its methanol requirement. Domestic coal-to-methanol production can support chemical industries and reduce import bills.
Way Forward
- Coal gasification should be promoted selectively and strategically, not as an unlimited expansion of coal use.
- Projects should be prioritised where they reduce critical imports such as ammonia, methanol, urea and industrial feedstock.
- Carbon capture, utilisation and storage should be integrated wherever feasible. Without carbon management, coal gasification may become a high-emission pathway.
- Water-use norms must be strict. Plants should use recycling, zero-liquid-discharge systems and avoid water-stressed locations.
- India should invest in indigenous gasifier technology suitable for high-ash domestic coal. Dependence on imported technology may reduce the strategic value of the programme.
- Environmental monitoring must cover air emissions, water discharge, ash, slag, land impact and community health.
- Coal gasification should be aligned with India’s broader energy transition. It should complement renewable energy and green hydrogen, not weaken them.
Conclusion
Coal gasification is an important part of India’s strategy to use domestic coal for higher-value industrial products such as syngas, methanol, ammonia, urea and hydrogen. The Government’s target of gasifying 100 million tonnes of coal by 2030, supported by incentive schemes of ₹8,500 crore in 2024 and ₹37,500 crore in 2026, shows that it has become a major energy-security priority.
However, coal gasification is not a clean-energy solution by itself. It is a cleaner and more flexible use of coal only when supported by advanced technology, carbon management, water safeguards and strict pollution control. Its success will depend on whether India can balance import substitution and industrial growth with climate responsibility and ecological protection.
