Here's another activity that can work very well when used on or before the Earth Day or Earth Hour lesson. It is actually a play with detailed teacher's notes and the script which will help your learners understand common misconceptions about how wind energy is used to generate electricity. This play uses familiar story and characters (who doesn't know Harry Potter?!) to convey important energy info about wind.
This 4-page 'Energy Play' lesson plan was kindly provided by Energy Kids and is also available from their website for free download.