Porcupines' quills, or spines, take on various forms, depending on the species, but all are modified hairs coated with thick plates of keratin, and embedded in the skin musculature.
Produce up to 400-Watt of power for free in your own back yard. The wind turbine will produce more power up to 400-Watts at 28 mph. If the wind dies down the turbine will continue to produce power in winds as low as 5.6 mph. This wind generator is used to charge 12-Volt batteries and mounts on any 1.5 in. Schedule 40 pipe.
The wind turbine has an electricity generation capacity of 40 MW, which means that it has a very high power-to-height ratio, and can power a whopping 13,333 homes by itself, at peak power production. It costs $48 million to manufacture. This translates to a reasonable cost of $1.20 per watt of generation capacity.