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March 9, 2026
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2025/26 Most Expensive Winter in History of ISO-NE Markets
Snow accumulation amid Winter Storm Fern in the Boston area
Snow accumulation amid Winter Storm Fern in the Boston area | © RTO Insider 
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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 MarketNatural GasNEPOOL Participants CommitteeReliabilityResource Adequacy