Disclosed herein is apparatus for increasing efficiency in transmitting direct electric (DC) energy. The apparatus includes a voltage stabilizer that includes, a wire connected to a power line for transmitting the DC electric energy; an electrical substance encircling the wire, an electromagnetic-field generating coil encircling the electrical substance at regular intervals in a direction perpendicular to the wire, the electromagnetic-field generating coil being connected to the wire, a voltage-stabilization circuit unit stabilizing voltage of the DC electric energy input into the apparatus before outputting the DC electric energy, and a connector connecting the power line to the wire.
