The photogalvanic effect was studied in a photogalvanic cell containing EDTA as reductant, Methylene blue + toluidine blue as photosensitizer. The photopotential and photocurrent generated were 742.0 mV and 110.0 mu A, respectively. The observed conversion efficiency was 0.5398 per cent and the maximum output of the cell was 81.62 mu W. The photogalvanic cell can be used for 34.0 min in the dark. The effects of different parameters on the electrical output of the cell were observed and a mechanism has been also proposed for the generation of photocurrent in the photogalvanic cell.