Answers.comÂ® is making the world better one answer at a time. The element that makes the strongest material is carbon, and the material which is made is graphene. Thao Hg.
<br /><br /> Solar power is the cheapest renewable energy source for small-scale use, such as pocket calculators, LED lights, and remote (small) electrical appliances. Hydroelectric power is the cheapest renewable energy source for large-scale production. That is, it has the lowest cost to construct and maintain the generating facilities compared to the amount of energy produced.
Used the world over to power entire cities, hydroelectric power is the most common form of renewable energy. Hydroelectricity is a much cleaner form of electricity than using fossil fuels. There are a few drawbacks, however.