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.
Geothermal power (energy from the heat found inside the earth's crust) seems like the perfect way to cheap, infinitely renewable power -- except for the dangerous earthquakes that might occur as a result of collecting the Earth's steam. 1  Ultimate Alternative Energy Quiz.  10 Wacky Forms of Alternative Energy.