The HVDC back-to-back facility Shi Shinano is equipped with thyristor static inverters and went into service in 1977. The Shin-Shinano operates with a symmetrical voltage of 125 kV. Before the extension in 1992 the maximum transferable power was 300 megawatts, now they are 600 megawatts.
Frequency Converter Station
The Shin Shinano Frequency Converter Station is one of three frequency converter stations that link Japan's western and eastern power grids. The station houses two converters, one of which opened in 1977, the other in 1992. The other two stations are at Higashi-Shimizu and Sakuma.