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The Sun is the first source of most forms of energy.

First we have solar photovoltaic - the direct conversion of solar radiation into electricity.

Wind is also created by the sun, since solar radiation falling on the earth produces warm and cold regions. The air in a cold region becomes more dense and therefore higher pressure. This higher air pressure causes the wind to blow from the cold region toward the hot region. So wind turbines convert the power from the wind into electricity - but the original source was the sun!

The process of producing fossil fuels began millions of years ago, when the sun shone on the trees and grass. These were eventually compressed and converted to coal, oil or gas.

Waves happen because of the wind, and so the ultimate source is again, the sun. However tidal power, where a high tide is captured by a barrage and then allowed to flow out through a water turbine, is due to interactions between the gravitational forces of the moon and the sun on the oceans.

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