Converter stations and substations

What is a converter station?

A converter station converts electricity between Alternating Current (AC) and Direct Current (DC). AC is used in each country’s transmission systems, while DC is used for sending electricity along the subsea cable.

What is a substation?

A substation is a point of connection to an electricity network and transforms the voltage of electricity to make that connection. A substation is required at each end of the Nemo Link interconnector to connect it to the transmission systems in the UK and Belgium.

Why DC?

Using subsea cables Nemo Link connects two High Voltage AC electricity systems separated by the North Sea. The Nemo Link interconnector will utilise High Voltage Direct Current (HVDC) technology, which avoids the need to synchronise the two interconnected AC networks.

HVDC allows efficient transportation of electricity over large distances and in particular for subsea applications. It is also highly controllable and brings operational benefits to both transmission systems.