The study on dispersing nanoparticles in transformer oil to elevate their dielectric properties has evolved significantly in the recent decade. Alongside the conventional dispersion techniques (mechanical stirring & ultrasonic homogenization) in practice, this work experiments with the microwave energy of 2.45 GHz frequency radiated onto the TiO2 nanoparticle-based nanofluid (TNF). The electrical and thermal properties of TNF (TiO2 nanoparticle & surfactant dispersed in transformer mineral oil) are experimentally investigated & presented in this article. Effective synthesis procedure to enhance the dielectric properties with good dispersivity has been recognized from the superlative combination of dispersion techniques. Its effectiveness in enhancing the electrical and thermal properties is investigated by verifying its dielectric breakdown strength, dielectric constant (εr), dielectric dissipation factor (tan δ), and flash & fire point. Results justified that the TNF synthesized by combining the processes of stirring, Ultrasonic homogenization, and microwave irradiation in a rational sequence exhibited better electrical & unaltered thermal properties when compared with samples prepared through stirring and sonication. TNF prepared through microwave synthesis improved the AC breakdown voltage (BDV) by 16.92% more than TNF prepared without microwave synthesis. Hence this could be an effective route to prepare the TNF with improved electrical properties.