"2025 Regional System Plan On December 8, 2025, the ISO published the final version of its 2025 Regional System Plan (RSP25), a comprehensive biennial system planning analysis that provides a 10-year view of New England’s grid.  The report highlights that demand for electricity is projected to grow significantly between 2025 and 2034, driven mostly by states’ clean-energy and electrification policies. These policies are advancing the transition toward renewable generation while increasing adoption of electric vehicles and electric heating, reshaping both the level and timing of electricity consumption. "

"RSP25 also outlines how the power grid will need to adapt to these changes, including managing the rapid growth of behind-the-meter solar, which will push daytime electricity use to new lows on mild, sunny days. It identifies emerging long-term transmission needs and ongoing regional efforts to prepare the grid for more renewable energy, such as projects aimed at increasing transfer capability through Maine and supporting new generation in northern New England. While not a blueprint for future resource development, RSP25 serves as a broad planning tool that helps policymakers, utilities, and stakeholders anticipate challenges and coordinate investments to ensure continued reliability as the region moves toward cleaner energy. "