Others have been used in the past. Each one has advantages and disadvantages. Through the years studies have proven that some of these alternatives may cause a greater threat to us by using them than by not using them. On the bulletin board you see pictures of these alternative energy sources. WIND energy has been used for used to pump water from wells.
Hydroelectric power is electricity produced from water turning turbines.
There are only about 25 good locations for tidal power plants in the world. Old Faithful Geyser is a perfect example of this. Water and steam sprays from a hole in the ground where water is heated to such a point that it boils and turns to steam. Holes can be drilled in rocks to release this energy. This is released by splitting atoms by a process called fission which produces heat energy and electricity.