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Madawaska was built by General Electric and is based on their earlier design of the world's first fully thyristor valve link, the 320 MW Eel River back-to-back HVDC station near Dalhousie, NB. However, instead of using synchronous condensers for voltage control and reactive power supply to the thyristors, Madawaska uses switched filter and shunt reactor banks connected to the high voltage busses on each side. In 2017, Madawaska was upgraded.