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ISO-NE interconnection

ISO New England coordinates interconnection to the administered transmission system for applicable generation and elective transmission projects.

Guide updated October 9, 2026.

Confirm jurisdiction and the current process​

First establish whether the project belongs in the ISO process or a state-administered interconnection process. For applicable new ISO requests, the current guide directs customers to the cluster process and GridInterConnect for Transmission (GIC-T). Legacy and transitional records remain available through the Interconnection Request Tracking Tool (IRTT). Interconnection Process Guide

The governing documents include OATT Schedules 22, 23, and 25, with the applicable schedule determined by project type and scope. Use the current tariff and procedures linked from the guide to establish the correct application and study path. Record the selected cluster, applicable schedule, and request type in the project register.

Prepare access and project inputs​

Arrange the appropriate company identity, customer access, and permissions before the request window. Use the current GIC-T instructions and submission checklist to identify the required fields and attachments. ISO-NE's queue page explains which tool applies to new requests and where older requests are tracked.

For preparation, organize the project information into:

  • Company identity, contacts, project identifiers, and requested dates.
  • Facility type, generating-unit or storage configuration, and requested service.
  • Nameplate, net injection, charging capability, and related operating assumptions.
  • Proposed POI, transmission-owner interface, voltage, and location.
  • Drawings, site evidence, equipment data, models, and supporting documentation.
  • Required financial actions and a record of submission and acknowledgement.

Use the current terminology for requested interconnection service and capability. Keep service quantities separate from installed equipment ratings and from any later market-participation assumptions.

Organize models and drawings​

ISO-NE identifies Planning Procedure 5-6 and Operating Procedure 14 among the documents relevant to interconnection studies and technical requirements. Locate their current versions through the official process resources and determine what applies to the selected stage. Governing procedures

As an internal preparation practice, maintain one equipment register for generating units, inverters, transformers, collector circuits, plant controls, and reactive devices. Use it to cross-check the one-line, technical forms, and model package. Record software and model versions, supplier documentation, parameter bases, operating cases, and available test evidence.

For storage and hybrid projects, explain charging behavior, export controls, shared facilities, and the way individual resources contribute to the plant-level limit. Keep unresolved vendor settings and study assumptions visible so that the next reviewer can distinguish confirmed inputs from provisional ones.

Track site and financial evidence​

Determine site-control, study-deposit, readiness, and security obligations from the current tariff and cluster instructions. Avoid transferring a deposit amount or timing rule from a legacy IRTT project into a new GIC-T request. The process guide links to the controlling resources and current cluster information.

For internal coordination, connect each site document to its parcel, plant area, or interconnection route. Track term and scope alongside the project schedule. Keep a separate financial register for the obligation, amount, recipient, due date, payment or security reference, and acknowledgement status.

Assign ownership of follow-up information and decisions. A document in a shared folder should not be marked complete until the intended reviewer can identify its revision and the submission it supports.

Review the package before filing​

Recommended preparation checks include:

  1. Confirm that the project is using the correct schedule, process, and submission tool.
  2. Reconcile equipment ratings, requested service, and the capacity represented in each model.
  3. Check that the POI, voltage, geography, and transmission-owner references agree.
  4. Link each site exhibit and technical attachment to a controlled revision.
  5. Preserve the exact submission and log later information requests and responses.

Use the Interconnection Request Queue for the applicable public status information. A queue entry describes process status; it should not be treated as confirmation that all construction or operating requirements have been satisfied.

Official sources and scope​

Start with the Interconnection Process Guide, Interconnection Request Queue, and Interconnection Service resources.

This guide supports preparation and navigation. The effective tariff, current cluster instructions, and project-specific transmission-owner requirements control. A completed checklist does not establish application acceptance or compliance.