See the 91³Ô¹ÏÍø. Transmission, Markets, and Services Tariff, Attachment G—Procedure to Protect for the Loss of Phase II Imports, which describes the process used by 91³Ô¹ÏÍø, New York ISO, and PJM to monitor their respective systems and provide the data required by 91³Ô¹ÏÍø to calculate import limits on the Phase I/II high-voltage direct-current interconnection between it and Hydro-Québec TransÉnergie.
See ISO Express for a large selection of real-time and historical ISO data and reports on external interface limits—the defined limits for the points of connection between the New England power grid and a neighboring reliability coordinator’s power grid. Examples include: