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Solar power generation sets new record in New England – pv magazine USA

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April 23, 2025
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Solar power generation sets new record in New England – pv magazine USA
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The ISO-NE region experienced two solar power output records in the past week, leading to a record-low demand for electricity from the power grid on Sunday afternoon.

April 23, 2025
John Fitzgerald Weaver

The duck curve arrived in New England in 2018, and this Easter weekend, behind-the-meter (BTM) solar was the primary driver of record-low electricity demand on the ISO New England (ISO-NE) power grid. This outcome wasn’t unexpected, as similar patterns have emerged during past spring holidays.

Image — Source: ISO-NE

According to GridStatus.io, Sunday marked the second-highest BTM solar peak output in ISO-NE history, reaching 6.59 GW at 12:05 p.m. The all-time record was set just three days earlier, with 6.619 GW.

At 12:05 p.m., when BTM solar peaked, electricity drawn from utility-scale power plants was nearing its daytime low at 5.9 GW. At that moment, BTM solar alone (as seen in the chart above) was supplying approximately 54% of total electricity demand, which stood at 12.1 GW.

By 1:55 p.m., as both electricity demand and solar output eased, the region hit a new record-low net demand of 5.22 GW.

Image — Source: ISO-NE

At that moment, utility-scale solar was generating approximately 0.6 GW, while wind output hovered near its daily low at 400 MW. Nuclear power held steady at about 2.1 GW, and natural gas generation dropped to 1.7 GW, making it the second-largest source of power at that point.

The 5.22 GW net demand represents a 20% decline from the previous record low of 6.5 GW set the year before.

One notable effect of low demand and increasing solar generation was that, during the midday window, New England began exporting electricity to New York State. ISO-NE energy charts show that the Roseton 345 kV transmission line crossed into net export territory, delivering up to 368 MW to New York. This reversed the overnight pattern, when ISO-NE imported as much as 1.6 GW through the same line.

Image — Source: ISO-NE

New England’s BTM solar capacity is unique in the United States. According to an analysis by the Energy Markets & Policy team at Berkeley Lab, as of the end of 2023, New England is the only region where more electricity is generated from solar power systems smaller than one megawatt than from larger installations. Massachusetts leads the nation, with nearly 16% of its in-state electricity generation coming from small-scale solar, followed by Hawaii at 13%, California at 11.5%, Vermont at 10.3%, Rhode Island at 6.7%, and Maine at 5.1%.

This content is protected by copyright and may not be reused. If you want to cooperate with us and would like to reuse some of our content, please contact: editors@pv-magazine.com.

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