Fill in the Blanks

1. In the wind energy farms, the wind speed should be higher than ………. to maintain the required speed of the turbine.

2. The energy produced during controlled ………. reactions is used for generating electricity at nuclear power plants.

3. The energy available due to the difference in the temperature of water at the surface of the ocean and at deeper levels is called ………. .

4. Biogas is produced by the ………. of animal wastes or plant wastes in the presence of water.

5. Biogas is an excellent fuel as it contains 75% ………. along with other gases like ………., ………. and ………. .