a) a sensor module having a sensor housing, voltage and current sensors secured within the sensor housing and a service disconnect switch secured within the housing, said voltage and current sensors operable to receive voltage and current signals representative of voltage and current provided to the load and generate measurements signals therefrom, the service disconnect switch operable to controllably disconnect and connect the load to the electrical power lines, wherein the measurements signals include analog signals having a waveform representative of the voltage and current provided to the load; and

b) a removable measurement module including a measurement circuit operable to receive the measurement signals and generate energy consumption data therefrom, said measurement module including a device for communicating information relating to the energy consumption data, said measurement module configured to be coupled to the sensor module to connect the measurement circuit to the voltage and current sensors.