2025/26 Most Expensive Winter in History of ISO-NE Markets

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Snow accumulation amid Winter Storm Fern in the Boston area | © RTO Insider

Mar 8, 2026 | Jon Lamson

The winter of 2025/26 was the most expensive winter in the history of ISO-NE’s wholesale markets, driven by the lowest average temperatures in 20 years.

Energy Market Natural Gas NEPOOL Participants Committee Reliability Resource Adequacy

Keywordscybersecurity Iran Iran War ISO New England (ISO-NE)January 2026 winter storm liquefied natural gas (LNG)oil oil-fired generation Vamsi Chadalavada Winter Storm Fern

Jon Lamson

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