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.
With the development of the 55 kW wind power station in 1981, the early high costs of wind energy were dramatically reduced. Wind energy is now one of the cheapest energy sources when all external costs (e.g. environmental damage) are taken into account.