Atmospheric aerosol particles can be collected by and adhered to high voltage electric wires and can cause the power loss as well as other detrimental effects on electrical insulation. The mass of fine particles (PM2.5) adhered to wires is estimated using a modified size-resolved particle dry deposition model and a range of annual average PM2.5 concentrations found in literature in the Yangtze River Delta region of China. Annual mass collected by the surface of an unit length (1 m) of wire with a radius of 0.5 cm is estimated to be in the range of 1.56 × 104–1.46 × 105 µg. The actual mass adhered to the wire may be reduced by 85% of these estimated values considering washed off effects by rain. For a wire of 1.0 cm in radius, the annual mass adhered to the wire is estimated to be in the range of 4.68 × 103–4.35 × 104 µg after considering the wash-off effects by rain. This study provides a first estimation of particle mass collected by electric wires, although with large uncertainties, which can be used for subsequent impact studies of aerosol pollution on electricity transfer.