FACTS (flexible AC transmission system) devices are static devices which can be installed in electricity grids. These devices are used to enhance the controllability and power transfer capability of an electric power grid. The application of SMES in FACTS devices was the first application of SMES systems. The first realization of SMES using FACTS devices were installed by the Bonneville power authority in 1980. This system utilizes SMES systems to damp the low frequencies, which contributes to the stabilization of the power grid. In 2000, SMES based FACTS systems were introduced at key points in the northern Winston power grid to enhance the stability of the grid.