Sounds like a bad option for you. Don't think I would run an electric fence on an extension cord. You'd have to run electricity out there.We haven’t. The only electric we have out there is for a cozy coop heater that’s plugged into an extension cord then into the garage, which is separate from our house. We did try a heated water bowl our first winter and that shorted out and would’ve burned the whole coop down if my hubby hadn’t been home to hear the pop.