Didn't Art Bell quit his radio program after claiming someone was shooting towards his "KINGDOM OF NYE" property?
Not just solar panels, how about a two way set of elevated speed mag-trains that run from the Gulf to San Diego area, with spur connections to San Antonio, Albuquerque, and Pheonix. All the panels along the whole lenth could provide more than enough power to motivate several trains in each direction. The remaining power could be used to charge battery/capacitor banks that sit in reserve for the motion activated lasers that shoot anything between the sets of walls
Ripoffs and shots-at.
You know the ripoffs will be huge.
Cost of wall: $x.
Cost of solar panels for wall: $10x.