Communicating between a computer and multiple Arduinos
It is very interesting project. In my opinion, i would not do like you want to control generators from one point.


Look at ZigBee and Wireless sensor network. It is possible. Do more search, also there are several books about networking.
I think that would be more efficient to control the wind turbine with an Arduino and send only data to the main computer. Main computer should do some calculations or send some main configuration data or control on/off wind turbine basis of:

2.1  Metrological data (wind speed or else);

2.2 Storage SOC(if you will store it in batteries or somewhere);

2.3 Required power of grid and etc. etc.


Arduino UNO like you said, connected to computer could do just data collection and making it compatible with computer(MatLab or whatever) and spread control data from PC to targeted Arduino.

Added links

Could not add more than 2 links due to low reputation :)

http://www.digi.com/pdf/wp_zigbeevsdigimesh.pdf , http://forum.arduino.cc/index.php?topic=105273.0