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Wind generation in ISO New England (ISO-NE) averaged 68% higher from January through September 2026 than during the same months in 2025, according to a U.S. Energy Information Administration (EIA) analysis published October 14, 2026. The increase reflects a larger regional wind fleet, not a claim that every month rose by exactly 68%.
What the 68% increase measures
EIA compared monthly electricity generated by wind in ISO-NE during January–September 2026 with the corresponding January–September 2025 months. The result was an average year-over-year increase of 68%. It is a regional generation comparison based on EIA Form EIA-930, the Hourly Electric Grid Monitor.
Because the figure is an average across nine monthly comparisons, individual months varied. It should not be read as a 68% increase in every month or as a 68% increase in installed capacity.
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September 2026 produced 668.9 gigawatt-hours (GWh), the highest monthly total in the period covered. That was more than twice September 2025’s generation and nearly 10% above the previous 2026 monthly high, recorded in March.
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| Measure | Result |
|---|---|
| Average January–September year-over-year change | 68% higher in 2026 than in the same 2025 months |
| Highest month | September 2026: 668.9 GWh |
| Previous 2026 monthly high | March 2026; September was nearly 10% higher |
| September comparison | September 2026 was more than double September 2025 |
Why ISO-NE wind output rose
EIA attributes the increase to additions to the region’s wind-generating capacity. ISO-NE wind capacity rose 47% during 2026 to 2.5 gigawatts (GW), following a 12% capacity increase in 2025. A larger fleet can produce more electricity when wind conditions are comparable, although the available output still changes with weather and operating conditions.
The EIA analysis does not identify a specific project, turbine manufacturer, weather pattern, transmission upgrade or policy change as the cause. The evidence supports capacity growth as the explanation, but it does not assign the increase to one named development or non-capacity factor.
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Generation records continued after September
Daily peak
Wind generation reached about 47.3 GWh on October 6, 2026. That daily total was 1% above the previous peak, set on September 10. The October record is a daily output milestone and occurs outside the January–September window used for the 68% average.
Monthly versus daily records
Monthly totals show sustained production over an entire calendar month, while a daily record captures a shorter burst of output. They answer different questions: September identifies the strongest month in the reported 2026 period, whereas October 6 identifies the highest single day cited by EIA.
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How 2026 compares with 2025 totals
ISO-NE generated 4,619 GWh of wind electricity from January through September 2026. That is 1.9% more than the 4,533 GWh generated during all of 2025.
This comparison needs a time-period qualification: the 2026 figure covers nine months, while the 2025 figure covers twelve. The fact that nine months of 2026 already exceeded the complete 2025 total indicates how much stronger 2026 production had been, but it is not an equal-period year-over-year comparison.
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| Period | Wind generation | Coverage |
|---|---|---|
| January–September 2026 | 4,619 GWh | 9 months |
| Full-year 2025 | 4,533 GWh | 12 months |
What to watch when interpreting the statistic
- Generation is not capacity. The 68% figure describes electricity produced; capacity increased 47% to 2.5 GW.
- Use matching months for year-over-year comparisons. January–September 2026 should be compared with January–September 2025, not with the 2025 full-year total.
- Monthly output can fluctuate. Wind production depends on conditions in each month, so the average does not imply identical growth across the nine months.
- Records have different time scales. The 668.9 GWh September result is a monthly record in the cited period; 47.3 GWh on October 6 is a daily record.
Data source and scope
The figures come from the EIA’s October 14, 2026 “In-brief analysis,” with Alex Mey listed as principal contributor. The underlying data are from EIA Form EIA-930, the Hourly Electric Grid Monitor. The scope is ISO New England, the regional power system represented by ISO-NE, rather than all wind generation in New England considered through a different boundary.
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