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This study aimed to investigate the solidification process of 23% tetra-n-butyl ammonium bromide (TBAB) aqueous solution due to the application of DC voltage. TBAB hydrate is an example of thermal energy storage system with phase change temperature around 5–10 oC. The voltage was applied continuously through commonly sold copper electrodes which was inserted into the sample. The diameter of electrodes were 1 mm and the gap were approximately 0.5 mm. The value of the applied voltage in the range of 15 to 30 V was varied as the experimental parameter. The overall experiments were repeated for two times to ensure the data repeatability. The experimental results showed that the TBAB hydrate will not formed until a minimum value for 20 V voltage was applied. The increase of the voltage applied led to higher solidification temperature and reduction of the supercooling degree.