I am not aware of any new BPL operations...Most, if not all of the major ones, have shut down due to lack of profit. If it recently popped up, it's likely a bad insulator or transformer...is it only in one direction? Does it change when it rains or
I'd be interested in the photo.....also any recording of the audio you can make...my email is my call at earthlink dot net.
(fought TVI/RFI for 14 years at Gulf States Util/Entergy, TX)