Within the scope of the Supercable project granted by ENDESA, we have study some possible applications of the superconducting cable on linking of sub-stations. One of them considers the possibility to link two sub-stations at the medium voltage level (25 kV) by both, a standard set of copper cables and their equivalent superconducting cable. The second case establishes a comparison between a medium voltage superconducting link and the high voltage, 220= kV, counterpart. As in the first case, the energy and emissions savings are clearly coming from the lower impedance of the SC cable, in the second case the benefit is clearly due to the absence of transformers. Although superconducting cable benefits are not only related with efficiency or environmental impact, the higher efficiency could be an added value when considering a SC cable installation.