Proving that you can probably create energy from almost anything, the fine people at Tropicana France have this fun video (and a very catchy melody) showing how they could create electricity from "THE POWER OF AN ORANGE". After showcasing a few sparks, the team then creates a billboard powered entirely by a whole bunch of oranges.
And to show that they are environmentally friendly, the company goes on to say that while oranges were harmed (they did have needles shoved through them), they were collected and reused in a compost or used to create biogas. I'll pass on the biogas joke. Enjoy the video.