Australian Grid Frequency Live — Queensland NEM Region

Data Explorer - Time Series

Examine a recorded period, compare frequency and deviation, and download the selected data.

Checking available history…

Duration from Period Start

or

Australia/Brisbane (UTC+10). Original observations cover approximately one second each. Maximum selection: 24 hours and 100,000 source records.

Choose a period to explore.

Historical frequency

Hz

Drag across the graph to zoom, or use the buttons.

Zoom changes only the view until you press Use Zoomed Range; its boundaries round outward to milliseconds. CSV includes the entire selected period; empty average bins remain empty. Graph lines break across missing data.

RoCoF shows signed [f(t) − f(t − 1 s)] / 1 s at recorded timestamps, in mHz/s. The earlier frequency is linearly interpolated from original readings. Windows crossing gaps, invalid readings, duplicate timestamps, sequence breaks or timing discontinuities are excluded. Both ends must be within the selected period. No extra averaging is applied; this does not resolve subsecond peak RoCoF.