Concept :Inter-twig piezo
This was based on the fact that an nework of interconnected tree branches and twigs cause more forced vibrations than an isolated piece of branch. A piezo device is connected between branches and twigs using an elastic material.As the branches move about in the wind, the piezo gadget is stretched and power generated. Since the devices will be interconnected, a single vibration due to wind becomes amplified and repetetive, thus creating more power.This further relies on trees with enough leaves because leaves provide the surface area for air resistance. Thus a leafless tree will not be ideal for this design.