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New England wind generation surges as capacity additions accelerate

New England wind generation surges as capacity additions accelerate

Built World Interactive

Monthly wind output in ISO-NE averaged 68% higher in 2026's first nine months than a year earlier

October 20th, 2026: Interior asks court to reconsider New England Wind approval

Overview

Updated Oct 31

Monthly wind generation on New England's grid averaged 68% higher in the first nine months of 2026 than in the same months of 2025, according to the U.S. Energy Information Administration. September produced 668.9 gigawatt-hours, more than double September 2025 and the year's highest monthly total.

Regional wind capacity rose 47% in 2026 to 2.5 gigawatts, and offshore output peaked at about 1,100 megawatts on September 24. On October 20, the Interior Department asked a federal court to let it reconsider its approval of the New England Wind offshore project.

Why it matters

New England's grid is shifting toward wind, changing how the operator plans for peak demand and winter reliability.

How big is it really

Wind power by US region, January to August

New England is growing fast from a small base: about 1% of US wind. These totals show +36% through August; the 68% averages monthly gains on its grid.

New England: 2648 → 3611 GWh. Ranks 7 of 10.

Wind power by US region, January to August (GWh)
Name20252026Source
West South Central113202127535EIA, Electric Power Monthly, Table 1.14.B
West North Central8831490465EIA, Electric Power Monthly, Table 1.14.B
Mountain3740843537EIA, Electric Power Monthly, Table 1.14.B
East North Central3320734874EIA, Electric Power Monthly, Table 1.14.B
Pacific Contiguous2402523286EIA, Electric Power Monthly, Table 1.14.B
Middle Atlantic73887066EIA, Electric Power Monthly, Table 1.14.B
New England26483611EIA, Electric Power Monthly, Table 1.14.B
South Atlantic23722181EIA, Electric Power Monthly, Table 1.14.B
Pacific Noncontiguous480439EIA, Electric Power Monthly, Table 1.14.B
East South Central333372EIA, Electric Power Monthly, Table 1.14.B

As of 2026-10-31. Every Census division in EIA Table 1.14.B, all sectors, utility-scale plants, year to date through August, in GWh. 2026 values are preliminary. The story's 68% is EIA's separate grid data for ISO-NE, January to September. The sources do not explain the gap. Sources: EIA, Electric Power Monthly, Table 1.14.B.

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Key Indicators

68%
Average increase in monthly wind generation, Jan-Sep 2026 vs 2025
EIA reported the increase in its October 14 Today in Energy analysis.
2.5 GW
Regional wind capacity
Capacity grew 47% in 2026 after a 12% increase in 2025.
668.9 GWh
September 2026 wind generation
More than double September 2025 and the year's highest monthly total.
4,619 GWh
Wind generation, Jan-Sep 2026
Already 1.9% more than the full-year 2025 total of 4,533 GWh.

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Organizations Involved

ISO New England
ISO New England
Regional transmission organization
Grid operator for New England

Operates the six-state region's high-voltage transmission system and wholesale electricity markets.
U.S. Energy Information Administration
U.S. Energy Information Administration
Federal statistics agency
Published the Today in Energy report

The federal government's energy statistics agency, which publishes the Today in Energy analysis series.
NE
New England Power Pool
Stakeholder organization
Participants committee for ISO-NE markets

The stakeholder body representing market participants in ISO-NE's planning and operations.

Timeline

2025 October 2026

9 events Latest: October 20th, 2026 · 3 weeks ago
Tap a bar to jump to that date

  1. Interior asks court to reconsider New England Wind approval

    Latest Legal

    The Interior Department asked a federal court to remand the 2024 construction and operations plan for the 129-turbine, 2,600 megawatt project off Massachusetts. Its filing says the earlier approval did not adequately explain compliance with environmental and navigation requirements.

  2. EIA reports 68% average increase in monthly wind generation

    Report

    Today in Energy analysis covers Jan-Sep 2026, citing capacity growth and offshore wind output.

  3. Daily wind generation sets new record at 47.3 GWh

    Data

    Output edged 1% above the September 10 peak.

  4. Combined wind output peaks at about 2,000 MW

    Data

    Onshore and offshore wind together reached their highest combined output.

  5. Offshore wind output peaks at about 1,100 MW

    Data

    Offshore output hit its high during a nor'easter that had minimal transmission impact.

  6. Daily wind generation peaks at about 46.8 GWh

    Data

    Daily wind output set a record that would stand for less than a month.

  7. September wind generation hits 668.9 GWh

    Data

    Monthly output more than doubled September 2025 and set the year's high.

  8. March sets year's wind generation high

    Data

    March wind generation was the year's high before September surpassed it by nearly 10%.

  9. Wind capacity grows 12% in ISO-NE

    Capacity

    Regional wind capacity increased 12% during 2025, setting up faster growth in 2026.

Scenarios

1

Wind capacity keeps climbing as offshore projects connect

Likely Resolves by End of 2027

Discussed by: EIA and ISO-NE reports

More offshore wind projects come online through 2027, pushing capacity and generation higher. State procurement targets and ISO-NE's interconnection queue support continued growth. Federal reviews now challenge at least one approved project, New England Wind, which could slow new offshore additions. The 47% capacity increase in 2026 suggests the buildout has momentum.

2

Transmission constraints cap wind growth

Possible Resolves by End of 2027

Discussed by: ISO-NE and NEPOOL

Grid congestion and interconnection limits slow new wind connections. Curtailment events rise as wind output outpaces transmission capacity, especially in winter when gas pipelines are constrained. ISO-NE has noted significant transmission outages scheduled in coming months.

3

Winter storm tests wind's reliability contribution

Uncertain Resolves by Apr 30, 2027

Discussed by: ISO-NE winter outlook

The 2026-2027 winter tests whether wind can contribute during peak heating demand, when gas pipelines are constrained. A strong winter performance could accelerate the transition; a weak one could slow it. ISO-NE presents its Winter Outlook at the November Participants Committee meeting.

4

Court sends New England Wind approval back to Interior

Possible Resolves by End of 2026

Discussed by: Interior Department filing; ACK for Whales; Sen. Sheldon Whitehouse

The government asked the court to remand the approval so Interior can decide again. A remand would delay construction of the project, which has not started. Whitehouse warned the move could derail a bipartisan Senate permitting bill.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

2000-2019

Texas wind buildout (2000s)

Texas went from about 180 megawatts of wind capacity in 2000 to over 24,000 megawatts by 2019, becoming the nation's wind leader. The state approved billions in transmission lines through Competitive Renewable Energy Zones to move wind from rural areas to cities.

Then

Wind generation grew from negligible to a major share of Texas electricity.

Now

Texas showed that transmission investment and capacity additions can rapidly scale wind generation.

Why this matters now

New England is following a similar pattern, with capacity additions driving generation growth, though on a smaller scale and with offshore wind as a new factor.

1991

Vindeby offshore wind farm (1991)

Denmark built the world's first offshore wind farm at Vindeby, with 11 turbines totaling 5 megawatts. The project proved offshore wind was technically feasible.

Then

Offshore wind remained niche for years.

Now

It launched an industry that now supplies significant power in Europe and is expanding in the U.S.

Why this matters now

New England's offshore wind buildout is part of this technology's maturation, with output now peaking above 1,000 megawatts in the region.

Sources

(7)
+1
U.S. Energy Information Administration, Today in Energy American Journal of Transportation ISO New England Biscuit's Field Notes WBUR News ack.net U.S. Energy Information Administration