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.
Right now, renewable energy is actually already cheaper than coal and nuclear power at every step. A unit of electricity from Eskomâs new coal plants cost about R0,80/kWh, from nuclear R1,00/kWh while a unit of electricity from solar photovoltaic cost R0,80/kWh and from wind only R0,60/kWh. Source.