Figure 4.
Two time-series line graphs illustrate performance ratio anomalies, labelled as P R anomalies, plotted against date and hour in U T C. Graph a corresponding to period covers late July to early August 2024, while graph b, corresponding to period covers late June to early July 2025. In both graphs, the line represents temporal variations in P R anomalies, with the horizontal zero line indicating normal conditions. Shaded regions denote heatwave periods. Diamond markers highlight the trough points where the most negative anomalies occur, and square markers indicate recovery points where the P R returns to approximately ninety percent of normal performance. The graphs show pronounced negative excursions during heatwaves, followed by partial or full recovery after the heatwave ends, demonstrating the impact of extreme temperature events on system performance over time.Performance ratio anomalies during and post 1S for Amibil. (a) 1S; (b) 2S
Source: Authors’ own work