The difference between hydel power and thermal power are as follows:
(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. E.g.: Bhakra Nangal project.
(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.
E.g.: Badarpur thermal plant of Delhi.