Energy can be expensive, or it can be very cheap. A collection of energy generators could provide lasting energy at little or no cost.
Science challenge: Make inexpensive energy generator.
Recommended links:
This handy link can help you get the right current and voltage. Not good at math? Just use the software.
http://www.sengpielaudio.com/calculator-ohm.htm
AC generator
http://www.globalspec.com/reference/53093/203279/principles-characteristics-and-management-of-ac-generators-alternators
DC generator
http://www.hsc.csu.edu.au/physics/core/motors/2696/PHY933net.htm
Harvesting electricity from plants
http://inhabitat.com/scientists-discover-methods-of-harvesting-electricity-from-plants/
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