Live market data
SPP price forecast
SPP's two trading hubs on one axis: settled real-time against the day-ahead clearing price, in the market where wind sets the tone more than anywhere else in the country.
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SPP's two trading hubs on one axis: settled real-time against the day-ahead clearing price, in the market where wind sets the tone more than anywhere else in the country.
What will power cost in SPP?
SPP hub prices peaks at $610 on Thu, 6 PM, against a low of $11.94 — a swing of $598 across the window. North Hub is the heaviest area at 812 $/MWh.
Every line above, and who produced it.
The settled real-time price at this hub. Source: SPP.
The settled real-time price at this hub. Source: SPP.
Congestion is why these price apart. Each hub’s settled price with every forecast published for it.
Each day of the window on its own.
Every hour of the window, shaded by load.
| 0 | 6 | 12 | 18 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thu, 8/27 |
| Hub | Peak ($/MWh) | Peak hour | Low ($/MWh) | Average ($/MWh) |
|---|---|---|---|---|
| North Hub | 812 | Thu, 6 PM | 11 | 39 |
| South Hub | 610 | Thu, 6 PM | 12 | 33 |
| Forecast | Produced by | Method | Horizon |
|---|---|---|---|
| South Hub settled | SPP | SPP day-ahead hourly and real-time five-minute LMPs at the trading hubs | Day-ahead clears once daily; real-time settles every five minutes |
SPP publishes cleared prices, not probabilistic forecasts, so no band is shown. Wind-forecast misses are the dominant error source: a few gigawatts of unforecast wind routinely moves real time far from day-ahead.
SPP settles trade against two hubs: North (Kansas, Nebraska, the Dakotas) and South (Oklahoma and the Texas Panhandle). Both sit inside the US wind belt, and the spread between them is mostly a wind-and-transmission story — when the north is windy and the lines south are full, the hubs price apart.
SPP regularly serves more than half its load from wind — the highest share of any US market. Prices follow the wind forecast: windy nights clear near or below zero, calm summer evenings clear high. That makes the day-ahead-versus-real-time comparison here largely a wind-forecast scorecard.
SPP's day-ahead market is a financially binding auction clearing the day before delivery. Its price is the market's collective expectation for the hour; the real-time price is what conditions actually delivered. The scorecard above measures the difference over the settled window.
curl "https://askthegrid.com/api/v1/grid/series?iso=SPP&metric=dam&node=SPPNORTH_HUB"
Connect your agent to mcp.askthegrid.com and this forecast is a tool call away — the same host Claude and ChatGPT connectors already use.
Two aggregated price points: SPP North Hub across Kansas, Nebraska, and the Dakotas, and SPP South Hub across Oklahoma and the Texas Panhandle. They are the reference prices for trade across the fourteen-state footprint.
Wind. When overnight wind output exceeds what load and export capacity can absorb, prices clear below zero — wind with production tax credits keeps running at negative prices. It is among the most frequent negative-price markets in the country.
Mostly because the wind forecast misses. Day-ahead clears on the forecast; real time clears on delivery. A windier-than-forecast night undercuts day-ahead, a calmer one overshoots it — the scorecard above puts numbers on how often each happens.
Plotted window Aug 27, 2:00 AM CDT → Aug 28, 1:55 AM CDT. Real-time updates continuously; day-ahead once per day.
| Fri, 8/28 |
|---|
Darkest cells are the tightest hours. The window peaks at 610 $/MWh on Thu, 6 PM, local to the market.