Live market data
SPP solar forecast
SPP's short-term solar forecast against actual output — still the smallest renewable on this grid, and the fastest-growing thing in its interconnection queue.
Fetching the latest published forecast…
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SPP's short-term solar forecast against actual output — still the smallest renewable on this grid, and the fastest-growing thing in its interconnection queue.
How much solar power will SPP get?
SPP solar output peaks at 2,756 MW on Mon, 12 PM, against a low of 0 MW — a swing of 2,756 MW across the window. Solar forecast is the heaviest area at 2,756 MW.
Every line above, and who produced it.
The grid operator's own published forecast for these hours. Source: SPP.
Each day of the window on its own.
Every hour of the window, shaded by load.
| 0 | 6 | 12 | 18 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fri, 8/28 |
| Series | Peak (MW) | Peak hour | Low (MW) | Average (MW) |
|---|---|---|---|---|
| Solar forecast | 2,756 | Mon, 12 PM | 0 | 1,081 |
| Solar settled (recent) | — | — | — | — |
| Forecast | Produced by | Method | Horizon |
|---|---|---|---|
| Solar forecast | SPP | SPP mid-term solar forecast and actual solar output | 7 days ahead, hourly |
SPP publishes a point forecast with no confidence interval. This is the short-horizon operational forecast; convective cloud cover across the plains is the dominant error source.
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 one against actual production. The fleet is young and small next to SPP's wind, which makes the numbers modest; they are stated plainly rather than dressed up.
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.
The scorecard below sizes the forecast miss over the settled window. With a small fleet the absolute numbers are small; the percentage numbers are the ones that say how well the forecasting actually works.
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.
Roughly the next four hours at five-minute resolution — SPP's short-term operational forecast, the one dispatch uses. The provenance above states that horizon explicitly.
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 Aug 28, 5:00 AM CDT → Sep 5, 4:00 AM CDT. Reissued continuously; the latest vintage is shown.
| Sat, 8/29 |
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| Sun, 8/30 |
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| Mon, 8/31 |
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| Tue, 9/1 |
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| Wed, 9/2 |
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| Thu, 9/3 |
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| Fri, 9/4 |
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| Sat, 9/5 |
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Darkest cells are the tightest hours. The window peaks at 2,756 MW on Mon, 12 PM, local to the market.