Bigger is better has practically become a rule of thumb in the wind power business.
Indeed, the typical wind turbine size has grown from about 300 kilowatts in 1990 to a whopping 7.5 megawatts in 2011.
A team of electrical engineers in Texas is challenging the industry’s conventional wisdom by building a wind turbine about 1/10 the size of a single grain of rice.
J.C. Chiao, a professor of electrical engineering at the University of Texas, Arlington, and Smitha Rao, a graduate research associate at UT, Arlington, developed the so-called micro-windmill technology based on recent advances in micro-robotic devices.
The micro-windmills are about 1/15 of an inch wide and can generate electric power from ambient wind.
http://thingsigrab.wordpress.com/2014/01/11/micro-windmills-may-one-day-power-your-smart-phone-forbes/