Abstract: A unit monitors power and reports to a central location. The unit receives an A/C power signal to be monitored, senses a zero crossing of the A/C power signal, and delays an interval so as to sample the A/C signal after a 90 degree phase delay after the zero crossing. Samples are stored in a static recording medium, such as an EEPROM. A processor detects anomalous conditions in the A/C signal using stored configuration values, and reports to a central location at a unit-dependant time after detecting an anomaly. The unit responds to commands from the central location and reports the recorded samples of the A/C power signal, as well as a contemporaneous value of the A/C power signal. The unit also receives and updates revised configuration values.