Underground Coal Gasification (UCG)

Why in the News?
The Union Ministry of Coal has signed Coal Mine/Block Production and Development Agreements (CMDPAs) for four coal mines—marking the first tranche of commercial coal blocks in India with embedded provisions for Underground Coal Gasification (UCG).

About Underground Coal Gasification (UCG)
UCG is an advanced technology that converts coal into synthetic gas (syngas) directly within underground coal seams, without the need for conventional mining. The process involves injecting oxidants (air/oxygen/steam) into coal seams to produce a combustible gas mixture consisting mainly of hydrogen, carbon monoxide, and methane.

Key Features

• Enables utilisation of deep, thin, or unmineable coal seams.
• Eliminates the need for surface mining, reducing land disturbance.
• Produces syngas that can be transported and used for multiple industrial purposes.

Significance for India
UCG has the potential to significantly expand India’s usable coal reserves by tapping otherwise inaccessible deposits. The syngas produced can be used as a feedstock in fertiliser production (urea, ammonia), reducing dependence on imports. It can also support domestic production of chemicals like methanol, dimethyl ether (DME), and synthetic fuels, strengthening energy security and industrial self-reliance.

Geographical Context
The identified coal blocks are located in Andhra Pradesh and Odisha, including both partially explored and fully explored mines.

Economic and Strategic Importance
The initiative aligns with India’s goals of reducing import dependence, boosting domestic energy production, and promoting innovative clean coal technologies. It also supports sectors like fertilisers, petrochemicals, and energy.

Concerns / Challenges
Key challenges include environmental risks such as groundwater contamination, subsidence, and emission control. Technological complexity, high initial costs, and the need for robust regulatory frameworks are also critical concerns for large-scale adoption.

Sources: PIB