In the schematic layout of a typical wind farm shown above, we have tried to identify the typical dimensions that characterise an installation. Cable usage is of course totally dependent on the size of the turbines, both in MW and also in tower height (LV cables), spacing between towers (MV interconnects) and the distance from the grid connection, MV or HV underground or sub-sea cables. It is therefore difficult to derive typical cable consumption, but across all the installation types, cables are probably going to account for 5-8% of the cost of the wind farm. Since investment in wind power projects in 2007 is estimated to have been about $35bn, this means a cable market of approximately $1.8 –  2.8bn.