Ontario coincident-peak tracker
The five highest Ontario-demand hours between May 1, 2026 and Apr 30, 2027 set Class A customers' Global Adjustment for the following year. Dodge them and the bill drops by six figures per megawatt. Data: IESO public reports, refreshed half-hourly.
Current top-5 peaks · base period 2026–2027
| Rank | Date | Hour ending | Ontario demand (MW) |
|---|---|---|---|
| 1 | 2026-07-14 | 17:00 | 25,646 |
| 2 | 2026-07-02 | 18:00 | 24,734 |
| 3 | 2026-07-13 | 18:00 | 23,982 |
| 4 | 2026-07-03 | 17:00 | 23,857 |
| 5 | 2026-07-01 | 14:00 | 23,833 |
Day-ahead prices (Ontario zonal)
Today · 2026-08-20
$0.00–$95.51/MWh · amber = 4 priciest hours (shed here) · green = cheap hours (precool here)
Sources: IESO ICI Ontario Demand report, Day-Ahead Hourly Ontario Zonal Price, Day-Ahead Totals. Forecast peak uses day-ahead Total Load, a slightly conservative (high) proxy for Ontario demand. Top-5 peaks shown on distinct days, matching how ICI peaks land in practice.