Due to increase in energy consumption it is important for researcher to develop an efficient thermal energy storage fluid that capture heat for electricity production system via thermal solar applications. The aim of this research is to investigate and optimized the anodization parameter to synthesize aluminium oxide film on aluminium foil, which is the primary component of the nanoparticle thermal energy storage fluid. The temperature used for the formation of film via anodization procedure was 281 K to 297 K. A Box–Behnken design method was adopt to design experiments and analysis statistical information based on experimental input. The output response of the derived polynomial equation was found to fit well with experimental data with R2 equalled​ to 0.98 and demonstrated insignificant lack of fit. From the ANOVA results, it is clear that temperature and concentration are significant parameters. As temperature and concentration changes the hardness of aluminium oxide film ranged between 169 to 201. An increase in temperature support the movement of charge along the electrolyte medium which promote the formation of oxide film in the solution. Results illustrated the ectothermic activity of the anodization reaction and the electric current movement in thing aluminium film. Future work will need to be conducted to fabricate nanoparticle from the aluminium oxide film obtained from this experiment.