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NordBalt HVDC Light connection strengthens the integration of Baltic energy markets with northern Europe.

The transmission system operators in Sweden, Svenska Kraftnät, and in Lithuania, LITGRID turtas AB, have awarded ABB contracts to supply a new HVDC Light transmission system between the two countries. The 700 MW ±300 kV  transmission will link the electricity networks in the Baltic and Nordic regions.

It is the world’s longest HVDC extruded underground and subsea cable system, and will help to strengthen the security of the power supply in the three Baltic countries and in southern Sweden, and integrate an emerging joint Baltic electricity market with the Nordic and European markets. HVDC Light transmission will also increase capacity, facilitate power exchange, enhance grid reliability and improve the security of electricity supply at either end.

The system incorporates special features such as active AC voltage support providing greater network stability and black-start capability providing faster grid restoration after a blackout. It is designed for integration into a future pan-European grid with the evolution of the DC grid concept, under discussion around the world.

ABB will design, engineer, supply and commission two 700 MW, ±300 kV (kilovolt) converter stations using ABB’s HVDC Light technology, one in Nybro, Sweden, the other in Klaipeda, Lithuania. The order also includes the supply and installation of two 300 kV underwater cables, each 400 km long, and land cable routes comprising 40 km on the Swedish side, and 10 km on the Lithuanian side.

Main data

Commissioning year: 2017
Power rating: 700 MW
No. of poles: 2
AC voltage: Swedish side: 400 kV
Lithuanian side: 330 kV
DC voltage: ±300 kV
Length of DC submarine cable route: 400 km
Length of DC land cable route: 40 km (Swedish side) 
10 km (Lithuanian side)
Main reason for choosing HVDC: Length of sea crossing
Asynchronous networks
Application: Interconnecting grids

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