The objective of this study was to develop and evaluate electro‐enhanced dechlorination of trichloroethene (TCE) in groundwater using Fe°. A bench‐scale flow‐through Fe° reactor column with direct current was tested to increase the efficiency of Fe° medium by providing an external supply of electrons. The bench‐scale column tests confirmed that the application of direct current with Fe° was highly effective in enhancing the rate of TCE dechlorination. The t1/2for the TCE dechlorination without current was 10.3 hours and the t1/2for the TCE dechlorination with current was about 1 hour. The dechlorination mechanism appears to be reductive dechlorination, with the electrons supplied by the iron oxidation and external direct current power supply serving as the source of the electrons.