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For ages solar cookers were made use of in 3rd world countries where electricity and gas was not readily available. Nowadays various solar oven designs are not only used in these regions to make food, but also to boil water for purification.

And like other solar technologies, there's no reason first world countries should not promote solar cooking at home to help save energy. Although cooking may take four times longer than conventional ovens, no electricity or fuel is used - just the power of the sun.

A number of interesting solar oven designs have been made over the years, but they typically take one of three forms: parabolic design, panel design, or box design.

Parabolic Shape:

A parabolic solar cooker, as the name implies, is made from any reflective material in a parabolic (bowl like) shape that focuses sunlight to a single point. It is the most effective at cooking food quickly and efficiently, however, it tends to be more expensive and hard to make by hand. Furthermore, its fixed shape makes it less portable and raises some safety concerns.

Panel Cooker:

This shape usually is in a bowl-like shape, and direct the sun's energy to one area. But it differs to a parabolic cooker in that it is put together with a number of reflective, flat panels and is less rounded.

Although not as effective as a parabolic cooker, it is safer, easier to make, and can be folded up for portability. Panel cookers come in a number of innovative designs, the simplest being made from a fold-able, reflective windshield shade.

Box Shape:

Very different to the other two designs, the box cooker works by trapping the sun's heat, instead of simply focusing it on a central point. It is designed in such a way that it let's light in, but stops that heat from escaping. As more sunlight comes in, the hotter it gets.

This results in the entire area of the box to get hot and be able to cook larger portions of food at a time. This design is by far the simplest to put together - all you need is a black cardboard box with one side covered in tin foil and a sheet of clear perspex or glass on top to hold in the heat.

What's great about most solar oven designs is that they can be built from everyday materials in a few short hours. Like a conventional oven or stove, they can be used to prepare anything - such as roasted meat, steamed vegetables, rice, fried eggs, and baked bread. And since a solar cooker is used outside, it will not heat up the kitchen and place stress on your cooling system.

And if you think that over 75% of American households use their oven or stove on a daily basis - a tremendous amount of energy could be conserved if more of us used solar oven designs during summer.

So why not solar cooking out for yourself. You really have nothing to lose. If you are not willing to spend money on a professionally made design, why not build one at home with the kids - the internet provides a whole host of free blueprints and instructions, so try it out and have fun saving power.