Conventional

(i) They are the energy resources in use since ages.

(ii) They make use of non-renewable sources of energy.

(iii) They are expensive.

ADVERTISEMENTS:

(iv) They can cause pollution; e.g., Coal

(iv) They can cause pollution; e.g., Coal petroleum, natural gas, electricity, etc.

Non-conventional

(i) They are in use recently only.

ADVERTISEMENTS:

(ii) They make

(iii) They are cheaper.

(iv) No pollution is caused by them; e.g., Solar, wind, tidal, geothermal, biogas, etc.