New or Modified Interconnections

The ISO administers the complex process for adding new power plants, power plant upgrades, and transmission upgrades to the tightly interconnected regional power system. Through extensive engineering studies, we determine whether such interconnections would be feasible without adversely affecting reliability and how they should be accomplished.

Interconnection Agreements and Information

Below, you can access information and materials related to connecting new generators or modifying existing generators in New England. Documents types include:

• Large generator interconnection materials—agreements and information related to interconnection request for generating facilities that will be larger than 20 MW after construction or modification
• Small generator interconnection materials—agreements and information related to interconnection requests for generating facilities that are no larger than 20 MW
• New or modified elective transmission upgrade (ETU) materials—agreements and information related to merchant transmission facility (MTF), pool transmission facility (PTF), or other transmission facility (OTF)

Submit an Interconnection Request

1. To interconnect a new generator or modify an existing generator, see Schedule 22: Standardized Large Generator Interconnection Procedures and Schedule 23: Standardized Small Generator Interconnection Procedures of Section II of the ISO Tariff (the Open Access Transmission Tariff).
2. To interconnect a new ETU or to modify an existing merchant transmission facility (MTF), pool transmission facility (PTF), or other transmission facility (OTF) see Schedule 25 Elective Transmission Upgrade Interconnection Procedures of the Open Access Transmission Tariff (OATT).
3. Use the Interconnection Request Tracking Tool (IRTT), a web-based application, to submit requests to interconnect proposed generators, upgrades, or ETUs.
• Customers can register for an account on the IRTT page.
• If you aren’t an ISO customer yet, please see the New Customer Registration page for guidance on establishing a relationship with the ISO.

If the IRTT is down, submit the appropriate form:

• OATT Schedule 22 Appendix 1 - Large Generator (LGIP) Interconnection Request Form
• OATT Schedule 23 Attachment 2 - Small Generator (SGIP) Interconnection Request Form
• OATT Schedule 25 Appendix 1 - Elective Transmission Upgrade (ETU) Request Form

Track Generator Interconnection Requests

• Use the IRTT to track your request to interconnect a proposed generator or upgrade or ETU.
• Status reports for current projects are published below. You can also view the IRTT public queue. (Log in not necessary.)

Related Resources

• See the IRTT User Guide.
• Questions? Email IRTT Customer Support at irtt@iso-ne.com, or contact ISO Customer Support.
• See the Interconnection Request Studies page.
• Visit the Forward Capacity Market (FCM) page to learn about submitting a show of interest and other participation details.
• See the Forward Capacity Market and the Interconnection Process for New Generation training materials.
• See ISO Operating Procedure No. 14: Technical Requirements for Generators, Demand Resources, and Asset Related Demands.
• See ISO Planning Procedure No. 5: Proposed Plan Application Procedure.
• See ISO Planning Procedure No. 5-1: Procedure for Review of Governance Participant’s Proposed Plans.
• See ISO Planning Procedure No. 5-5: Special Protection Systems Application Guidelines.
• See ISO Planning Procedure No. 5-6: Scope of Study for System Impact Studies Under the Generation Interconnection Procedures.
• See ISO Planning Procedure No. 10: Planning Procedure to Support the Forward Capacity Market.