What is the energy demand of a secondary surveillance radar?
What you propose is possible.  TCAS is essentially a secondary surveillance radar, and is a piece of avionics which doesn't break the bank power wise. In a moderate traffic environment, I have seen 3 to 5 amps at 24VDC.  I am sure it is higher in a dense environment.  The interrogation power requirement doesn't go up but processing the returns may take more power.

5 amps at 24VDC is a modest power requirement for a mid-sized wind energy system, therefore at first blush, what you propose is quite possible.