the skagerrak 1–3 scheme consists of a overhead line and a underwater cable. it has a capacity of 1,050 megawatts (mw). both land parts in denmark and in norway uses overhead lines from the cable landing point to the converter stations. the overhead lines in denmark are set to be renovated in 2016 for increased lifespan. the towers were originally constructed for four poles, but were rebuilt for three conductors (three poles) when skagerrak 3 was established. near aggersund hvdc skagerrak crossed aggersund strait overhead on towers with a span, but were later converted to underground cables. the pylons of this span were the tallest electricity pylons of an hvdc line in europe.