[en] Low cost and easy biodegradability makes the deep eutectic solvents (DESs) viable alternative to expensive ionic liquids (ILs).Thus, DESs promise wide ranging applications including nanomaterial synthesis, dearomatization of gasoline and CO₂ sequestration. DESs have been marked as electrolyte for dye-sensitized solar cell, and in redox flow battery as catholyte or anolyte. In all these advanced energy related applications electron transport and transfer events are integrally involved. The C₃₇ value, a measure of the efficiency of scavenging pre-solvated electrons is the highest in ethaline in case of nitrate ions, which indicates the slowest solvation process in this DES. The pre-solvated electron capture by a DNA base, an aspect considered to be important in cancer radiotherapy, could be monitored conveniently in these liquids at much longer time scale, compared to those reported in aqueous solutions. Bimolecular rate constants for the reaction of solvated electrons with nitrate and the DNA base have been calculated, and compared in the three DESs. These experimentally obtained values are comparable to the diffusion controlled rate constants in DESs. (author)