Live market data
IESO solar forecast
IESO's forecast for solar generators on its grid, two days ahead, against their reported hourly output.
Fetching the latest published forecast…
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IESO's forecast for solar generators on its grid, two days ahead, against their reported hourly output.
How much solar power will Ontario get?
IESO solar output peaks at 304 MW on Fri, 3 PM, against a low of 0 MW — a swing of 304 MW across the window. Solar forecast is the heaviest area at 304 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) |
|---|---|---|---|---|
| Solar forecast | 304 | Fri, 3 PM | 0 | 65 |
| Solar settled (recent) | 284 | Sat, 12 PM | 5 | 154 |
| Forecast | Avg miss (MW) | Avg miss % | Bias | Hours |
|---|---|---|---|---|
| IESO solar forecast | 31 | 26.5% | +21 | 11 |
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 |
|---|---|---|---|---|
| Solar forecast | IESO | IESO solar 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 solar 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 solar 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 solar output.
IESO's forecast for solar 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 |
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| Sun, 10/11 |
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| Mon, 10/12 |
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Darkest cells are the tightest hours. The window peaks at 304 MW on Fri, 3 PM, local to the market.