An electrical grounding device comprises an elongate shaft with plate members projecting radially outward from a lower region of the shaft. The shaft and plate members are made of an electrically-conductive material, and are connected such that an electric current can flow between the plates and the shaft. The device is installed by boring a hole into the earth to a selected depth less than the length of shaft above the plates. The grounding device is inserted into the borehole and driven into the earth below the borehole until the upper end of the shaft projects a desired distance above the adjacent earth surface, leaving the shaft projecting sufficiently to allow connection of grounding cables. The borehole is preferably filled with gravel or other suitable fill material, and water may be added to the fill to enhance electrical conductivity between the device and the earth.