This is partially mitigated by double use of the island's connectors as interconnects. If energy production on the island dropped to zero, the entire cable capa

This is partially mitigated by double use of the island's connectors as interconnects. If energy production on the island dropped to zero, the entire cable capacity would be able to move power between connected nations. The 'flat' United Kingdom has 2.8GW of existing pumped storage capacity. (http://www.british-hydro.org/hydro_in_the_uk http://www.british-hydro.org/hydro_in_the_uk) If this was the only power generation in the area it would be an issue, but even such a large power plant as what they propose would be a highly effective addition to the grid of the north sea area.