Copper chloride GICs were investigated by means of cyclovoltammetric, pulsed galvanostatic and AC impedance measurements. It was found that the electrochemical reduction takes place in two different potential regions. A small amount of Cu(II) species is reduced to metallic copper via a Cu(I) intermediate. The majority is reduced in a two-electron-transfer-step at lower potentials. The deintercalation reaction is irreversible.