Wind generation in New England’s grid ran 68% higher in the first nine months of 2026 than a year earlier

Wind generation on the ISO New England grid averaged 68% higher across the first nine months of 2026 than in the same months of 2025, according to the Energy Information Administration. The agency’s Oct. 14 analysis puts total wind output from January through September at 4,619 gigawatt-hours, already 1.9% above the 4,533 gigawatt-hours the region produced in all of 2025.

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The gain comes from more turbines rather than from unusually breezy weather, at least as far as the agency’s explanation goes. Regional wind capacity rose 47% in the first nine months of 2026 alone, and the generation figures now reflect that expansion. The result is a year in which New England’s wind output has already outrun the whole of the previous one, with a quarter of the calendar still left to run. The sections below set out what the monthly figures show, what the agency says is behind them, and what remains unsaid.

What the nine-month average and the September peak show

EIA compared the monthly wind generation averages for January through September of each year, using hourly reporting under Form EIA-930 from the agency’s Hourly Electric Grid Monitor. The EIA analysis of ISO-NE wind generation found that the 2026 monthly average ran 68% above the 2025 average for the same period.

September was the strongest month of the year. Wind output reached 668.9 GWh, which was more than double the September 2025 figure and nearly 10% above the previous high set in March. Daily output peaked on Oct. 6, 2026, at about 47.3 GWh, 1% above the earlier daily record from Sept. 10, 2026. Both records are recent, which is consistent with newly installed capacity contributing more each month, although the agency does not pin the daily peak on any single cause.

The annual comparison is the starkest. In January through September 2026 the region generated 4,619 GWh from wind, and the whole of 2025 produced 4,533 GWh. With three months still to report, 2026 had therefore already passed the previous full year, a milestone reached in the ninth month rather than the twelfth. Last year’s annual total thus became the benchmark that this year’s partial total cleared by 86 GWh, and the last quarter will add to that margin.

Capacity additions behind the generation numbers

The explanation EIA offers is capacity. Wind capacity in ISO-NE rose 47% so far in 2026, reaching 2.5 gigawatts, after a 12% increase in 2025. The agency tracks planned and completed additions in its monthly generator inventory, which is the dataset that supports capacity figures of this kind.

The article attributes the rise to growing capacity additions across the ISO-NE footprint, and it names no specific project. Readers will be tempted to credit a particular offshore array, but the agency’s text supports only the regional capacity totals and the percentages, not a project-by-project breakdown. For that detail, the underlying generator inventory is the place to look, and it records each addition by plant, owner and in-service month.

A 47% increase in capacity is a large step for a regional fleet that stood at roughly 1.7 gigawatts at the start of the year, a figure implied by the agency’s 2.5 gigawatt total. Generation grew by a larger share than capacity over the nine-month comparison, 68% against 47%, though the two numbers measure different things: one compares average output against the prior year and the other tracks how installed capacity has changed in 2026. Capacity that comes online partway through a year contributes only for the months it operates, so the full effect of the new turbines is still ahead.

Where ISO-NE wind sits among its neighbors

ISO New England is the independent operator that runs the six-state regional grid and its wholesale markets, as described on its own page about what the operator does. In EIA’s separate Oct. 15 analysis of summer demand, ISO-NE was one of four operators whose peak load came within 4% of its prior record without breaking it, as laid out in the agency’s piece on PJM, ERCOT and SWPP peak load records.

That juxtaposition is useful. New England’s grid was close to its demand record this summer, and the wind numbers show supply changing alongside it. More wind in the generation mix means more of the region’s electricity comes from turbines that burn no fuel, though wind output varies from hour to hour and day to day with the weather, and the monthly series shows that variability in the swings between March and September.

For now, the data from the monthly series support a simple reading. Capacity grew quickly, output grew faster, and the single best month came in September. How much of the late-year surge persists through the winter, when New England’s power system faces its own demands, will depend on weather and on whether the remaining capacity additions arrive on schedule.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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