Electrical power theft detection system is used to detect an unauthorized tapping on distribution lines. Implementation area of this system is a distribution network of electrical power supply system. Existing system is not able to identify the exact location of tapping. This system actually finds out on which electrical line there is a tapping. This is a real time system data transmission and receiving technique is used. This will provide an additional facility of meter reading with the same technique and in same cost. This will protect distribution network from power theft done by tapping, meter tampering etc.