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The proposal would upgrade the transmission system between northern Maine and more populous regions of southern New England.
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One upgrade has been placed in service since March 2026, according to the latest update to the Regional System Plan.
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Three upgrades have been placed into service since October 2025, according to the Regional System Plan Project List.
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Three upgrades have been placed into service since June 2025, according to the latest update to the Regional System Plan Project List.
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At the direction of the New England states, the ISO issued the request for proposals to enhance reliability and market efficiency, and to better integrate affordable resources.
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The ISO will undertake this novel role at the request of stakeholders seeking increased oversight of transmission equipment replacements.
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Two projects were proposed since March 2025, according to the latest update to the Regional System Plan Project List.
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The improvements establish a clear trigger for certain kinds of transmission upgrades.
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The ISO would not make decisions about whether specific projects should move forward.
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A recent request for proposals seeks to upgrade transmission between wind farms northern Maine and more populous southern New England.
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