Quarterly system performance report

The quarterly reports contain information on system performance related to ancillary services costs, constrained on/off costs, momentary frequency fluctuations above and below the normal band for each island reporting, and an overview of notices sent out to the industry.

2025

Quarterly system performance information - January to March 2025.pdf (PDF 1.28 MB)

2024

Quarterly system performance information - October to December.pdf (PDF 1.39 MB)

Quarterly System performance information - July to September 2024.pdf (PDF 1.4 MB)

Quarterly System performance information - April to June 2024.pdf (PDF 1.35 MB)

Quarterly System performance information - January to March 2024.pdf (PDF 1.66 MB)

2023

Quarterly System performance information - October to December 2023.pdf (PDF 1.75 MB)

Quarterly System performance information - July to September 2023.pdf (PDF 1.55 MB)

Quarterly system performance information - April to June 2023.pdf (PDF 1.5 MB)