The US Department of Energy has launched an interesting website to explain kids the importance of using the energy wisely. It's a very rich project with plenty of things to explore and interact with.
The weird thing is that there isn't much text to read. All is conceived with a learning by doing and learning by exploring approach, which is unusual but interesting to discover.
My favourite section is the "Why World" one, an interactive environment where kids are presented with daily situations in which energy is wasted. I like it because the small cases are brought to live with wit and creativity not forgetting the interactive element to support the learning process.
The agencies behind the project are Goodby, Silverstein & Partners and IQ Interactive.