Live market data
SPP solar forecast
SPP's hourly mid-term solar forecast across the plains, shown exactly as published and scored against observed output.
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SPP's hourly mid-term solar forecast across the plains, shown exactly as published and scored against observed output.
How much solar power will SPP get?
SPP solar output peaks at 2,989 MW on Sat, 4 PM, against a low of 0 MW — a swing of 2,989 MW across the window. Solar forecast is the heaviest area at 2,989 MW.
Every line above, and who produced it.
Observed or settled values for the plotted intervals. Source: SPP.
A published forecast for the plotted target intervals. Source: SPP.
Each day of the window on its own.
Every hour of the window, shaded by load.
| 0 | 6 | 12 | 18 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mon, 10/12 |
| Series | Peak (MW) | Peak hour | Low (MW) | Average (MW) |
|---|---|---|---|---|
| Solar forecast | 2,989 | Sat, 4 PM | 0 | 832 |
| Solar settled (recent) | 2,756 | Mon, 2 PM | 0 | 982 |
| Forecast | Avg miss (MW) | Avg miss % | Bias | Hours |
|---|---|---|---|---|
| SPP solar forecast | 143 | — | +37 | 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 |
|---|---|---|---|---|
| Solar forecast | SPP | SPP mid-term solar forecast | 7 days ahead, hourly | Issue time not exposed by this feed |
SPP publishes a point forecast with no confidence interval, so there is no band to calibrate. The scorecard compares the latest forecast for each settled hour with observed output.
SPP publishes its solar forecast twice — a five-minute short-term run reaching about four hours, and an hourly mid-term run reaching a full week — and this page plots the mid-term publication, scored against observed solar output from the short-term run over the hours both cover.
Solar is a single-digit share of SPP's energy today, concentrated in Oklahoma and Kansas — but it dominates the market's interconnection queue. The plains have excellent irradiance; what they lacked until recently was transmission and market maturity. This page will get more interesting every year.
Read the daytime peak and the ramp on either side of it. The page shows the operator's point forecast and scores it against observed output; SPP publishes no uncertainty band for it.
curl "https://askthegrid.com/api/v1/grid/radar/curves?iso=SPP&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.
A few gigawatts — a single-digit share of the market's energy, dwarfed by its wind fleet. But solar dominates SPP's interconnection queue, so the share is set to grow substantially.
This page shows SPP's hourly mid-term forecast, which reaches seven days. SPP also publishes a separate short-term forecast at five-minute resolution; it is not the series plotted here.
Mostly Oklahoma and southern Kansas, with projects spreading across the footprint. The southern plains have irradiance comparable to parts of the desert Southwest; transmission access, not sunshine, has been the constraint.
Plotted window Oct 12, 9:00 AM CDT → Oct 20, 8:00 AM CDT. Reissued continuously; the latest vintage is shown. Source snapshot Oct 13, 7:55 AM CDT.
| Tue, 10/13 |
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| Wed, 10/14 |
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| Thu, 10/15 |
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| Fri, 10/16 |
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| Sat, 10/17 |
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| Sun, 10/18 |
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| Mon, 10/19 |
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| Tue, 10/20 |
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Darkest cells are the tightest hours. The window peaks at 2,989 MW on Sat, 4 PM, local to the market.