Answer:
Hydel power: (i) It is generated by fast flowing water. (ii) It uses renewable resources. (iii) Initially its cost is high but later it becomes cheaper. (iv) It does not cause any pollution. Example: Bhakra Nangal project. Thermal power: (i) It is generated by using coal, petroleum and natural gas. (ii) It uses all non-renewable resources. (iii) Its cost is very high and its production is expensive. (iv) It does cause pollution. Example: Badarpur thermal plant of Delhi.
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