The Regional System Plan (RSP) is a critical tool developed by ISO New England to guide the electrical grid planning for the next decade, outlining necessary power grid needs and transmission upgrades to ensure grid reliability. As one of the organization's core responsibilities, the RSP serves as a valuable technical guide for policymakers, energy infrastructure developers, and owners, while also incorporating feedback from public forums attended by stakeholders such as market participants, state representatives, and advocates for consumers and the environment.

The RSP assesses the types of projects needed over the next 10 years, but it is not a proposal to build specific projects.