What is UCG?
UNDERGROUND coal gasification (UCG) is the partial in-situ combustion of a coal seam to produce gas.
You drill two boreholes: one to supply oxygen and water/steam, the other to bring the gas to the surface.
This gas can be used for heating and to generate electricity. The gas can in theory be processed to remove carbon dioxide to reduce greenhouse gas emissions. UCG has been proven in trials but developing a working system has proved more difficult.
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