ISO Interconnection study

Interconnection studies evaluate proposed interconnections with the ISO grid and are performed based upon the ISO tariff and in coordination with the applicable participating transmission owners. They include study reports, resource adequacy deliverability studies and options, impacts on affected (neighboring) systems, and the relationship between generation interconnection and the ISOs transmission planning process.

Process phases
Getting started
Interconnection request
Interconnection study
Interconnection agreement and queue management
New resource implementation process

Interconnection study informational presentations

Interconnection timeline and study process

Learn what to anticipate during the interconnection process, including an overview of timing, what to expect from joint meetings, requirements for posting financial security, and the impacts of a withdrawal on refunds.

Studies, study results, and project cost responsibility

Understand the study reports, resource adequacy deliverability studies and options, impacts on affected (neighboring) systems, and the relationship between generation interconnection and the ISO transmission planning process.
Suggested audience: Transmission-level interconnected facilities, distribution-level interconnected facilities, QF conversions, repowering facilities, and capacity increases

Generator interconnection queue and online resource information

Interconnection facility information
Find active, complete and withdrawn interconnection facilities and a summary of interconnection requests by study process starting with those received in 2015.
- FERC 845 Interconnection Study Statistics7/06/2023 11:33
- Master Control Area Generating Capability List
  Select Master Control Area Generating Capability List from the OASIS Atlas Reference menu.
- Briefing on Resources Available for Near Term Interconnection6/01/2022 14:54
- Cluster 15 Interconnection Requests9/05/2023 08:40
  Projects will be published in the ISO Generation Queue once they are validated in 2023 as proposed in the 2023 Interconnection Process Enhancement stakeholder process.
- Generator Interconnection Resource ID Report9/18/2023 08:47
  This is a static report that will be updated weekly providing a list of projects that are in the New Resource Interconnection process and how the units are progressing to its commercial operation date for the resource ID. The spreadsheet has instructions that describe the columns in the first tab of the spreadsheet.
- ISO Generator Interconnection Queue
  Link to the RIMS public site. To view Project Queue Report select Reporting tab on the RIMS web page.
  NOTE: If you have issues downloading the XLSX file in RIMS, click here.

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Process and requirements

The ISO operates under the terms and conditions of its FERC-approved tariff. Business practice manuals (BPMs) provide detailed rules, procedures and examples for the administration, operation, planning and accounting requirements of the ISO and the market that are consistent with the ISO tariff. The resources below provide additional information about the ISO interconnection process and procedures.

Relevant tariff sections
All new interconnection requests (IRs) are subject to Tariff Appendix DD, the Generator Interconnection Deliverability Allocation Procedures (GIDAP). New interconnection requests are no longer accepted under Tariff Appendices S, U, W or Y.

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Relevant business practice manuals

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Interconnection study forms

Appendix B to Generator Interconnection Study Process Agreement9/30/2022 15:23
Template for completion within 10 BD of the Phase I results meeting.
Generator Downsizing Request Form10/18/2018 10:53
Template for submission during the annual downsizing application window for those wishing to reduce their Generating Facility’s MW size.

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Interconnection request and technical data forms
To submit a new interconnection request or update an existing interconnection request, use the Interconnection Request (Appendix 1) Microsoft Word template and the Generating Facility Data (Attachment A to Appendix 1) Microsoft Excel spreadsheet -- both documents are required. Sample completed templates for both document types are available for reference.
Participating transmission owner financial security instruments
Use our standardized forms to post Interconnection Financial Security with the applicable Participating Transmission Owner.
Transmission plan deliverability allocation information
Generating facilities requesting full or partial capacity deliverability status must submit affidavits annually for the transmission plan deliverability allocation process. Dates and details are provided via market notice.

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Interconnection study resources

Generator Interconnection Deliverability Allocation Procedures Customer Guidelines10/01/2021 08:52
Cluster study process milestone planned schedules, updated to include Cluster 14 Supercluster adjusted timelines.
Affected Systems Contact List5/22/2023 10:46

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Participating transmission owner per unit costs
Learn the anticipated costs of procuring and installing facilities required to interconnect Generation to the applicable Participating Transmission Owner.
Generator interconnection technical bulletins
Use of technical bulletins is subject to the ISO website Terms of Use.
Deliverability for distributed generation - studies and reports
Understand the process for requesting deliverability for distributed generation facilities.
Docusign

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After the study phase

Contracts must be signed, the resource must be modeled in the ISO market systems, and metering and telemetry equipment will need to be installed.

ISO Interconnection study

Interconnection study informational presentations