| Primary | 9 Jun 2026 – 8 Jul 2026 | $90 |
| Comparison | 9 Jun 2025 – 8 Jul 2025 | $282 |
| Difference | −$193/MWh (−68%) |
Comparison window = prior corresponding period (same window one year earlier). Difference is primary minus comparison (red = dearer, green = cheaper).
Each point is the demand-weighted mean price at that half-hour across all days in the window (demand-weighted across the five regions). Dashed lines mark each window’s demand-weighted average.