In power grids, electricity is transmitted from power plants to substations, residential, and commercial facilities over power lines, which mainly run above ground. The electrical current that passes through power lines induces magnetic fields, which can then induce currents in nearby conductors. As the human body is a conductor of electricity, induced currents can excite human tissues. This may result in increased temperature, cancers, childhood leukemia, and nervous system disturbances, especially with prolonged exposure.