The transmission link, which is expected to start operations in 2018, will connect the electricity grid on either side of the Moray Firth in northern Scotland.
Under the contract, ABB will design, engineer, supply and commission two 320 kilovolt land-based HVDC Light converter stations.
ABB will provide a 1,200MW station at Blackhillock in Moray and a 800MW station at Spittal in Caithness.
The deal also requires ABB to deliver submarine and underground cables covering a total transmission length of about 160km.
ABB power systems division head Claudio Facchin said: "We are pleased to support this major transmission project that will enable integration of a significant amount of renewable energy into the grid and supply clean, emission-free electricity to millions of people.
"ABB pioneered HVDC technology and continues to lead the way through innovation, as seen from several recent breakthroughs."
SHE Transmission is strengthening the power network serving the north of Scotland to meet the growth in renewable sources electricity generation, with about 1,200MW of wind, wave and tidal energy planned to be linked.
ABB claims that the project is the largest investment in northern Scotland’s electricity network since the 1950s hydro development era.
Upon completion, the Caithness-Moray link will provide enough energy for about 2,000,000 residents in Scotland.
