I'm inclined to agree with the guy who thinks the green cable is some kind of communication gable. I am not sure but it looks to me like there's some kind of a flexible conduit coming out of the other side of these things That's probably power.
I agree, that's why I said the EGC is in the cord. That green thing to my eye is not a bonding jumper or serving some other grounding purpose.That is not an EGG, its a green data cable, device net, ethernet or similar. Those are valve actuators like Rorork, or Limitorque, maybe for a rising stem type valve, with a lead screw. Since there are so many valves, they are networked using the green cable. Discrete wiring to each valve would be a lot of wires!
What type facility is this? My guess is a treatment plant.