Alternate Energies

Alternative Energies:  Lots of science ideas for kids.  Choose Beginner, Intermediate or Advanced to get a list of age appropriate projects for alternative energy and power.

http://www.sciencebuddies.org/science-fair-projects/Intro-Energy-Power.shtml

An example:
A Battery That Makes Cents
Batteries are expensive, but you can make one for exactly 24 cents! In this experiment, you will make your own voltaic pile using pennies and nickels. How many coins in the pile will make the most electricity?