The Regional System Plan (RSP) is a comprehensive planning report on system needs and the resource and transmission facilities needed to maintain the reliability of New England’s power system over a 10-year horizon, while also accounting for market efficiencies and economic and environmental considerations. Developing an RSP at least once every three years is one of the ISO’s responsibilities as Regional Transmission Organization (RTO). To learn more, see Attachment K: Regional System Planning Process of the Open Access Transmission Tariff (Section II of the ISO Tariff).
Previous versions can be downloaded using the links below. Draft versions and discussion materials are posted on the Planning Advisory Committee webpage.
Three times per year, in support of the regional planning process, the RSP Project List is updated. The most recent and past RSP Project List updates are below. The RSP Project List includes relevant design and cost information for the following types of transmission improvements:
Also below are the Asset Condition List updates, which include costs and other information on upgrades or replacements of existing transmission facilities identified by the facility owner.
The ISO develops the RSP in collaboration with the Planning Advisory Committee (PAC), and ongoing data and analyses are posted on the PAC webpage throughout the year as they become available. For your convenience, you can also view system studies and associated materials grouped as follows:
See Competitive Transmission Projects for information and materials associated with the ISO New England’s request for proposals process for finding competitive solutions to identified transmission needs.
The ISO restricts access to all ISO and stakeholder-submitted materials marked as "Critical Energy Infrastructure Information." Some materials in this section contain CEII, and your browser cannot access them without the ISO’s prior approval. If you are not a market participant and wish to access this material, you will need to complete and submit a CEII Access Request Form and receive the ISO’s approval. If you are a market participant and wish to access this material, contact your organization’s security administrator (SA) for the ISO’s Customer and Asset Management System (CAMS). Your SA must enter your name into the CAMS database and assign you the necessary roles and permissions. For further information, see the Request CEII Access page.