A few thoughts:
(1) I don't think it's impossible to make something like this fairly invisible from the ground and fairly easily visible from the air.
(2) I agree that it's cables that are the real issue - however pylons are the easiest way to work out where the cables are.
(3) I think that this needs representing formally to National Grid / RIBA / whoever - who is the right body to do that? I wonder if perhaps GASCo? Anybody here on the GASCo committee?, if not I don't mind having a word with them - I'm not on the committee, but know about half of them.
G