There is only one type of wave that humans can see. Visible light. If the wave given off by the electric power line is visible light, then yes. If it is any other type of wave than it is not possible to see.
The electromagnetic waves given off by high voltage power lines are beyond the visible part of the spectrum.
They are too long. For a good comparison of different waves, look up "electromagnetic spectrum".
Yes. What you need to look at is the electromagnetic spectrum. There are many great graphical illustrations of this on the web.
They are way below the frequencies we see as light. Their frequency (60hz) is just inside the bottom of the audio range.
Electromagnetic waves come from accelerating electric charges, often electrons in atoms. The energy given off travels in a wave that is partly electric and partly magnetic.
Power is transmitted via radio waves for FM, AM radio, wifi, bluetooth, etc. Current is one component of power (you also need voltage). HV power lines transmit significant power in the electric field around the wires as well.
Waves consist of electric and magnetic field waves.
ultraviolet waves
Hydro-electric power (the power of moving water and gravity in dams, rivers, tides and ocean waves) produces electricity only.
electromagnetic waves
The lubrication for the generators is toxic and the electro-magnetic waves will fry you from the inside out.
electromagnetic waves can affect electric equipment