Does anyone know anything about wind energy?

Wind speed is measured (in knots) by the Beaufort Scale.
http://www.spc.noaa.gov/faq/tornado/beaufort.html

Power of the Wind
http://www.endurancewindpower.com/power_of_wind.html

Advatantages & disadvantages of Wind Power
http://www.articlesbase.com/environment-articles/advantages-and-disadvantages-of-wind-power-535693.html
http://sosrooflinesystems.co.uk/blog/2040/benefits-and-disadvantages-of-wind-power-uncovered/

Renewable Energy – the most reliable source of renewable energy is water power, most especially tidal water power.

Here in London in Roman times and right into the early Industrial Revolution of the 18thC there were dozens of tide mills along the banks of the River Thames.
How did they work. A simple mechanism which allowed a massive wheel or set of wheels to rotate in the direction of the tidal flow and then to reverse as the tide in the River Thames changed direction. So efficient were these tide mills, that one, which still survives today, could be in continuous production of power to drive flour mill machinery for up to 16 hours per day.

Medieval tide mill found at Greenwich – where I live.
http://www.greenwich.co.uk/news/tide-mill/

There is still one surviving windmill here in London, it dates from about 1800 and is at Brixton.
http://www.brixtonwindmill.org/