They use Geothermal Energy, which is used from plants to generate electricity.
I believe it is scientific laws.
The density of the water causes pressure, which causes water to move.
In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water. ... The lower energy form, NADP+, picks up a high energy electron and a proton and is converted to NADPH.
