List of HVDC projects

This is a list of notable high-voltage direct-current power transmission projects.
HVDC projects for long-distance transmission have two (or rarely, more) converter stations and a transmission line interconnecting them. Generally overhead lines are used for interconnection, but an important class of HVDC projects use submarine power cables. A back-to-back station has no transmission line and connects two AC grids at different frequencies or phase counts. Historical HVDC systems used the Thury system of motor-generators but these have all been made obsolete by later developments such as mercury-arc valves (now also obsolete), thyristors, and IGBT power transistors.
Legend.
Line type:
Line status:
Europe.
2 As of 9 December 2015, LitPol Link started trial operations.
3 Caithness Moray HVDC serves a number of renewable energy sources in the north of Scotland - see map 
4 Contracts due to be placed in 2016. 
5 Elia says construction expected to start in late 2017.
6 Date is that quoted to support the Shetland Wind Farm that SSE is a part investor in.
7 Decision on project expected in 2017 following consultation - see SSE PD reference.