Energy Intellect's centralised frequency monitoring captures event trace data where North Island Grid Frequency falls to or below 49.2Hz.

With a sampling rate of 20ms the recorded trace data provides a detailed view of the captured frequency excursion. Under Frequency Events over the past 12 months can be viewed below by selecting the appropriate event/date from the available drop down list.

Note: All event timing recorded in NZST, (*) indicates duration of event <200ms below 49.2Hz, smoothing filter applied to top graph.