Live market data
ISO-NE price comparison
ISO-NE's Internal Hub benchmark and three zones on one axis: settled real-time against the day-ahead clearing price, in the most gas-dependent market in the country.
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ISO-NE's Internal Hub benchmark and three zones on one axis: settled real-time against the day-ahead clearing price, in the most gas-dependent market in the country.
How do New England day-ahead and real-time prices compare?
ISO-NE hub prices peaks at $81.81 on Mon, 1 AM, against a low of $15.04 — a swing of $66.77 across the window. Internal Hub is the heaviest area at 82 $/MWh.
Every line above, and who produced it.
Observed or settled values for the plotted intervals. Source: ISO New England.
Observed or settled values for the plotted intervals. Source: ISO New England.
Observed or settled values for the plotted intervals. Source: ISO New England.
Observed or settled values for the plotted intervals. Source: ISO New England.
Each hub’s settled real-time price, cleared day-ahead price, and any model forecast published for the same delivery hours.
Each day of the window on its own.
Every hour of the window, shaded by load.
| 0 | 6 | 12 | 18 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sun, 10/11 |
| Location | Peak ($/MWh) | Peak hour | Low ($/MWh) | Average ($/MWh) |
|---|---|---|---|---|
| Internal Hub | 82 | Mon, 1 AM | 15 | 43 |
| NEMA/Boston | 82 | Mon, 1 AM | 15 | 42 |
| Connecticut | 84 | Mon, 1 AM | 15 | 43 |
| Maine | 77 | Mon, 1 AM | 15 | 41 |
| Forecast | Avg miss ($/MWh) | Avg miss % | Bias | Hours |
|---|---|---|---|---|
| Day-ahead auction | $10.41 | 23.6% | −$2.42 | 72 |
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 |
|---|---|---|---|---|
| Day-ahead clearing prices | ISO New England | ISO-NE day-ahead hourly and real-time five-minute LMPs at the Internal Hub and load zones; cleared market result | Day-ahead clears once daily; real-time settles every five minutes | Clearing time not exposed by this feed |
ISO-NE publishes cleared prices, not probabilistic forecasts, so no band is shown. Winter gas constraints are the dominant risk: a cold snap can move real-time prices several-fold against day-ahead within a day.
New England trades against the Internal Hub — the pool-wide benchmark — while settling load at eight zones. This page plots the hub alongside NEMA/Boston, Connecticut, and Maine, so both the benchmark and the geographic spread are visible on one chart.
Natural-gas availability and cost can affect New England dispatch, alongside load, outages, imports, bids, and transmission constraints. The day-ahead-to-real-time spread measures the market difference; this page does not attribute it to one cause.
ISO-NE's day-ahead market is a financially binding auction clearing before delivery. Its prices are cleared market results, not ISO-NE forecasts. The scorecard reports their divergence from settled real-time prices over matched locations and hours.
curl "https://askthegrid.com/api/v1/grid/series?iso=ISONE&metric=dam&node=4000"
Connect your agent to mcp.askthegrid.com and this forecast is a tool call away — the same host Claude and ChatGPT connectors already use.
The pool-wide benchmark price for New England — an aggregate across the system that forwards and hedges settle against, shown here alongside the load zones that actually pay it.
Because gas plants set the marginal price most hours and the region's pipeline capacity is tight. In winter, heating demand takes the pipeline space first, so power prices ride spot gas — and occasionally spot LNG — harder than anywhere else in the country.
Day-ahead clears on expectations; real time clears on conditions. In New England the sharpest divergences come in winter, when a colder-than-forecast evening tightens both the power system and the gas system underneath it at once.
Plotted window Oct 11, 5:00 AM EDT → Oct 12, 4:55 AM EDT. Real-time updates continuously; day-ahead once per day.
| Mon, 10/12 |
|---|
Darkest cells are the tightest hours. The window peaks at 82 $/MWh on Mon, 1 AM, local to the market.