This chapter sheds light on AC and DC power capacitors and the recent impacts of nanoparticles on enhancing capacitive charge in power capacitors. In addition, this chapter displays theories and effective parameters of nano-tech power capacitors. Lab-test measurements have been carried out for variant sorts and concentrations of organic and inorganic nanoparticles during different frequencies (10mHz – 10MHz) and temperatures (20°C-80°C). Moreover, this chapter reviews the ideal sorts and concentrations of nanoparticles for upgrading the capacitive charging on insulation of power capacitors. Thus, the novel nanodielectrics have been designed and fabricated for upgrading the electrical execution of multi-section metalized film capacitors.