I am worried about the 14 meter rise in deep ocean waters, which is the norm.
so. say the powerline is above the 14 meters usual sea level,
and the floatation devices that connects the line from its sides,
could be that high, but doubled. why.
if the sea level rises as waves, so does the floating platforms
that holds the powerline, and powerline can break, or be affected,
pushing itself up and down.
what it can do, it can anticipate the movement of the waves,
and move up and down following it, WHILE still supporting the powerline,
BUT not affecting its height.
So, much like the vehicles travelling through the under belly of the powerline,
there should be a vertical 'under belly' for the pole, powerline
connection moving up and down following the height of the waves,
without affecting the height of the powerline.
so not a gear mechanism.
but something rigid enough as connection to the powerline,
and yet, fluid enough to move up and down.
without affecting the powerlines themselves.
if that is a possibility.