Here is a great science craft to teach kids about alternative energy: a solar oven! Harnessing the power of the sun is cool and teaches us about caring for our environment and using renewable resources. Best of all, kids can make a snack they love, nachos, using the solar oven they made using this DIY. The directions are remarkably easy and you might already own all of the materials needed. It's a wonderful summer activity to do with your own kids, or in a community or classroom setting.
10 science activities for kids to learn about the SUN: sun light, including invisible light, solar energy, how it is related to earth, … so many interesting topics, and so many fun project ideas, for kids from preschool to kindergarten to school age.
Inquiry Engineering Lab: from STEMmom.org provides an entire lesson plan and group of activities for learning about wind power. Learn more about this energy source while creating at-home wind turbines out of a collection of household items.
How planets orbit the sun: A Montessori-inspired activity for kids