I have no experience with power line networking but I would start there and experiment.
If that doesn't work I would try two things: If the electrical cable is in a conduit or duct of some sort you could try to run a 600V rated Cat 6 cable (to comply with electrical codes) or fiber right alongside the feeders. That will not be easy as you likely have to pull the feeders, pair the network cable and then pull it back. And that is if the conduit hasn't collapsed or intruded by roots/water/dirt/etc. Second is an aerial line ran through trees or poles.
A third option is something most would avoid but just run a thin length of black poly tube with a fiber inside along the ground. Years ago a friend powered his shed at his parents countryside house by running a length of romex in a black sprinkler tube along the ground hugging the treeline of his property. Not exactly to code and illegal for power but sometimes you gotta do what you gotta do and he never had a problem.
Industrial stuff isn't far from consumer gear. Most of it uses the same components but in a rugged DIN rail or panel mount housing. Even industrial stuff is embracing wireless.
And for fiber look up BiDi - bidirectional - SFP's that use a single fiber that is easier to route. They sell rugged outdoor simplex fibers for this kind of stuff.
Never? Nah. Sure there could be issues with lightning or ground loops but A. use grounded surge arrestors at each end before termination into equipment, B. Don't use shielded cable. Unshielded in a conduit will be fine with 60Hz power but loads downstream producing harmonics (lots of switching supplies, VFD's, etc) can cause interference. This is why I said fiber a lot.
If that doesn't work I would try two things: If the electrical cable is in a conduit or duct of some sort you could try to run a 600V rated Cat 6 cable (to comply with electrical codes) or fiber right alongside the feeders. That will not be easy as you likely have to pull the feeders, pair the network cable and then pull it back. And that is if the conduit hasn't collapsed or intruded by roots/water/dirt/etc. Second is an aerial line ran through trees or poles.
A third option is something most would avoid but just run a thin length of black poly tube with a fiber inside along the ground. Years ago a friend powered his shed at his parents countryside house by running a length of romex in a black sprinkler tube along the ground hugging the treeline of his property. Not exactly to code and illegal for power but sometimes you gotta do what you gotta do and he never had a problem.
Industrial stuff isn't far from consumer gear. Most of it uses the same components but in a rugged DIN rail or panel mount housing. Even industrial stuff is embracing wireless.
And for fiber look up BiDi - bidirectional - SFP's that use a single fiber that is easier to route. They sell rugged outdoor simplex fibers for this kind of stuff.