Explanation:

Some time before, the Union Cabinet had approved a policy framework for development of UCG in unexplored coal and lignite bearing areas in the country.
Also, Coal India Limited has planned to invest about Rs 15,000 crore for capital expenditure, supercritical thermal power plant, solar energy and coal gasification this fiscal.
UCG is a clean coal extraction technology for extracting energy from the coal seams and lignite resources which cannot be mined through traditional mining technology.
It is mainly an industrial process which converts coal into product gases such as methane, hydrogen, CO and CO2 that are combusted for electricity generation.
The gasification process is carried out in non-mined coal seams using injection of oxidants which brings the product gas to surface through production wells drilled from the surface.