An energy conductor unit is a mechanism that allows the flow of electricity in one or several directions.
One such unit appears in the Deck Beta Conduit Hall room on the Frigate Orpheon in Metroid Prime. It had become damaged as a result of the Parasite Queen outbreak onboard, and was now discharging electricity across the room. The electricity periodically discharges in front of a tunnel. To get past it, Samus has to wait for the electricity to stop charging and quickly roll through the small tunnel.
By the time Samus returns to the Deck Beta Conduit Hall after the Orpheon crashes into Tallon IV, the unit had stopped discharging electricity.
"This energy conductor unit has been damaged. Use caution when approaching the arcing electricity."