Darrell maybe this guy can help you out--he made the tehter for NASA:
http://www.manufacturedirections.com...e-carroll.html
tethers can be used as a propulsive device or as electric generators, here's what happened to the generator one:
"...NASA has conducted several experiments with Plasma Motor Generator (PMG) tethers in space. An early experiment used a 500 meter conducting tether. In 1996, NASA conducted an experiment with a 20,000-meter conducting tether. When the tether was fully deployed during this test, the orbiting tether generated a potential of 3,500 volts. This conducting single-line tether was severed after five hours of deployment. It is believed that the failure was caused by an electric arc generated by the conductive tether's movement through the Earth's magnetic field.
from
http://en.wikipedia.org/wiki/Electrodynamic_tether
but what about the H3 on the moon? I hear tell a ton or two could fuel cold fusion on earth for nearly ever.