This is where the beauty of hybrid systems comes in. Many very livable sites produce 8 mph or more during certain times of the year, or when storms are passing through, and this wind can be harnessed. Tower height and location also make a big difference. Wind speeds average 50 to 60 percent higher at 100 feet compared to those found at ground level. The cost of a wind power system includes the cost of the wind turbine itself, the tower, and its installation.
Bigger machines are more costly, but can be more cost-effective.
The Sourcebook remains the best introduction to energy-efficient technology for common folks. Great reference to start design and cost estimation from each section. One of the best features of this book is the addition of the National Electric Code for RE systems. It's possible to pick a building material to build a house, design a solar electric system, decide on appliances, determine the use of a greywater system, and more from 562 pages. Real Goods Trading Company in Ukiah, California, was founded in 1978 to make available new tools to help people live self-sufficiently and sustainably.