Global energy demand is expected to grow 30% by 2040 due to shortages and increasing efficiency and clean energy needs. Nano devices can help meet this demand through applications in solar energy, wind energy, energy conversion, distribution, and efficiency. For solar energy, nano structures can increase photovoltaic cell efficiency to over 70% through anti-reflective coatings and multiple junctions. Nano composites can also enable lighter and higher performance wind turbine blades. Wireless energy harvesting using nano magnetic devices provides an unlimited energy source without battery replacement needs. However, the long term risks of nano materials and applications must still be fully understood and controlled.