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(a) Discovery of other forms of energy such as petroleum, hydroelectric and geothermal power.
(b) Exhaustion of old mines and lack of economically accessible reserves.
(c) Thermal plants built to use oil for the generation of electricity cannot use coal unless they are replaced.
(d) The high production costs in the extraction of coal makes it an expensive source of energy.
Faimus answered the question on April 19, 2018 at 13:25
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