Live market data
IESO wind forecast
IESO's forecast for wind generators on its grid, two days ahead, against their reported hourly output.
Fetching the latest published forecast…
01
IESO's forecast for wind generators on its grid, two days ahead, against their reported hourly output.
How much wind power will Ontario get?
IESO wind output peaks at 2,805 MW on Sat, 10 PM, against a low of 375 MW — a swing of 2,430 MW across the window. Wind forecast is the heaviest area at 2,805 MW.
Every line above, and who produced it.
Observed or settled values for the plotted intervals. Source: IESO.
A published forecast for the plotted target intervals. Source: IESO.
Each day of the window on its own.
Every hour of the window, shaded by load.
| 0 | 6 | 12 | 18 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fri, 10/9 |
| Series | Peak (MW) | Peak hour | Low (MW) | Average (MW) |
|---|---|---|---|---|
| Wind forecast | 2,805 | Sat, 10 PM | 375 | 1,397 |
| Wind settled (recent) | 2,796 | Sat, 7 AM | 468 | 1,519 |
| Forecast | Avg miss (MW) | Avg miss % | Bias | Hours |
|---|---|---|---|---|
| IESO wind forecast | 169 | 12.1% | −130 | 23 |
The latest published vintage of each forecast, against what settled. Smaller is better on every column. Bias is signed: positive means the forecast ran high.
| Series | Produced by | Method | Horizon | Issued |
|---|---|---|---|---|
| Wind forecast | IESO | IESO wind forecast, market participants, Ontario total | About 48 hours ahead, hourly | Issue time not exposed by this feed |
IESO publishes a point forecast with no confidence interval, so no band is shown.
IESO forecasts two wind quantities: market participants connected to its grid, and generation embedded in local distribution systems, which shows up as lower demand rather than as output. This page plots the market-participant forecast, the one comparable with reported wind output.
IESO republishes every hour. A past hour is scored against the forecast IESO published before the hour began; later hours show the newest publication. Hours run on IESO's delivery clock, Eastern Standard Time all year.
curl "https://askthegrid.com/api/v1/grid/radar/curves?iso=IESO&horizon=extended"
Connect your agent to mcp.askthegrid.com and this forecast is a tool call away — the same host Claude and ChatGPT connectors already use.
Generation connected to local distribution networks rather than to IESO's grid. IESO forecasts it separately because it reduces the demand IESO sees instead of appearing as wind output.
IESO's forecast for wind generation connected to its grid and taking part in the market, the output its hourly generator report counts.
Two days, hourly, republished every hour.
Plotted window Oct 9, 3:00 PM EDT → Oct 12, 2:00 PM EDT. Published hourly. Source snapshot Oct 10, 3:45 PM EDT.
| Sat, 10/10 |
|---|
| Sun, 10/11 |
|---|
| Mon, 10/12 |
|---|
Darkest cells are the tightest hours. The window peaks at 2,805 MW on Sat, 10 PM, local to the market.