Because of the high resistivity of the deep soil at the location where the Three Gorges Hydroelectric Power Station is built and the granite structure under the river bed, it is difficult to reduce the grounding resistance in this region.

• 三峡电站所在地区的土壤深处及河床以下为高电阻率的花岗岩结构,要降低其接地电阻相当困难。