I'm doing a project on wind energy….?

I need certain information on wind energy from as reliable a source as possible:
1) How much does a single wind turbine cost (the average turbine being used by governments)?
2) Does a single wind turbine (average size being used by governments) create a profit (in a typically windy area)?
3) Does a wind farm (of 30 or more turbines) create much profit?
4) Does the profit they create (if any) eclipse their cost?

Sorry about all of the questions and I would appreciate any information.

Thanks…………

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