How is the Frequency Response Measure (FRM) of a Balancing Authority calculated?

The Frequency Response Measure (FRM) of a Balancing Authority is calculated by taking the median of frequency deviation events. This method is particularly effective because it provides a robust metric that is less sensitive to outliers compared to averaging. The median focuses on the central tendency of frequency deviations, offering a clearer picture of the system's response to imbalances in supply and demand.

In the context of power system operation, frequency deviations can occur due to various factors, including sudden changes in load or generation. By analyzing these deviations and identifying the median, the FRM effectively represents the performance of the balancing authority in maintaining system frequency stability, ensuring that the values reflect typical operational conditions rather than being skewed by extreme events.

Using this approach helps operators assess the reliability of the frequency response and make better-informed decisions about grid stability and necessary adjustments to meet demands.