A multi-sensor system can be attached to a high voltage power line, draw power from the power line inductively, and convert the power to lower voltages and direct currents for operating cameras, sensors, a processor, and communications equipment that provide persistent intelligence, surveillance, and reconnaissance capabilities. The multi-sensor system can detect and track targets in detection regions and transmit such detection data and other data from the camera and sensors to a remote operator who can initiate response actions and send control instructions to the multi-sensor system from the remote location.