Quebec – New England Transmission
The Quebec – New England Transmission is a long-distance high-voltage direct current (HVDC) line between Radisson, Quebec and Westford Road in Ayer, Massachusetts. As of 2012, it remains one of only two Multi-terminal HVDC systems in the world and is "the only multi-terminal bipole HVDC system in the world where three stations are interconnected and operate under a common master control system".
450kV HVDC line (at right), on south side of Autoroute 20 east of the Nicolet station near Sainte-Eulalie, Quebec.
Sandy Pond converter station in Ayer, MA. The HVDC line can be seen near top of the image.
High-voltage direct current
A high-voltage direct current (HVDC) electric power transmission system uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems.
Long distance HVDC lines carrying hydroelectricity from Canada's Nelson River to this converter station where it is converted to AC for use in southern Manitoba's grid
HVDC in 1971: this 150 kV mercury-arc valve converted AC hydropower voltage for transmission to distant cities from Manitoba Hydro generators.
Pylons of the Baltic Cable HVDC in Sweden
Three-phase high voltage transmission lines use alternating currents to distribute power over long distances between electric generation plants and consumers. The lines in the picture are located in eastern Utah.
