Аннотация:A study is performed on the increasing of geomagnetic induced currents (GICs) during supersubstorms (SSS) that occurred on September 7–8, 2017 against the background of magnetic storms. The analysis includes two periods: from 23 to 04 UT on September 7–8, 2017 (the first supersubstorm with SML ~ –3600 nT) and from 12 to 20 UT on September 8, 2017 (the second supersubstorm with SML ~ –2600 nT and two intense substorms (with SML ~ –1500 nT). GIC is analyzed using data from detecting stations in Vykhodnoy and Kondopoga (Russia), Mäntsälä (Finland), Halfway Bush (New Zealand), and Torness (Scotland). Results show the GICs developed in a manner similar to that of the substorm westward electrojet’s spatiotemporal dynamics, with maximum GIC values observed at stations in the midnight sector. It is found that there is a relationship between the increasing of the GICs and an increase in geomagnetic indices IL and Wp that characterize substorm activity.