Oireachtas Joint and Select Committees

Tuesday, 21 April 2015

Joint Oireachtas Committee on Transport and Communications

North-South Interconnector: EirGrid

11:30 am

Mr. Fintan Slye:

Not without the circuit in between. In order to transmit electricity, we need a circuit in between. The technologies to do that are either underground or overhead technologies. If we go underground, we need the large converter stations at either end, because the underground technology uses a different power transmission technology. It uses high-voltage, direct current, HVDC, technology. All of the grid, all of the material in this room, everything we have, uses AC technology. We therefore need these converter stations to convert the power from AC to DC and back again. When we talk about converter stations, that is what that is. The HVDC cable is completely underground, but we have these converter stations at either end to convert them in and out. Hence, there is no existing network on which to deploy the technology to which I referred for Grid Link series compensation to maximise the usage of it. It is a case of needing additional infrastructure and examining what are the options for it. I hope I have managed to explain that.