Where does the wind get its power source?

The power of the wind comes from the sun. As the sun warms the air, it rises and displaces cold air, that cold air has to move out of the way, so we get wind. The air is also warmed and cooled indirectly from the earth and the sea. Because the earth is denser than the sea, the earth warms (and cools) more slowly than than the sea, so the air over the earth and the air over the sea are always different temperatures, so they are always trading places, so there is always wind at the seashore.