The Helios, by designer Sean McGreevy, is a grill that uses solar energy rather than electricity, making it an awesome, eco-friendly way to cook.
The Helios uses its reflective parabolic dish to capture the solar energy which travels from the dish to the grilling platform to heats the coil.
If it's a cloudy day, you can use the retractable plug stored in the base as your second option.
This product has been tested and is safe to use.
I personally think it's a cool grill, and an awesome concept, I am just not sure how fast it works and how much heat it can give off.