ISO Interconnection request

Resources newly interconnecting to the ISO controlled grid use an Interconnection Request to begin the process.

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

Interconnection request informational presentations

How and when to apply for interconnection and what to anticipate during the 10 week to 2½ year study process.

Interconnection application - study options

Learn about available study processes, how to apply for interconnection, and requirements for a valid application. (interconnection request, site exclusivity documents/deposit, study deposit, technical data).

Interconnection timeline and study process

Find out 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.

Submit an interconnection request

Determine which available study process is appropriate for your interconnecting facility then submit an interconnection request to begin the study. Interconnection Requests may be submitted electronically, including the interconnection request document below, through the ISO Resource Interconnection Management System (RIMS) application.

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.
- Interconnection Request and Study Agreement Form - Appendix 12/22/2023 14:58
- Sample - Interconnection Request and Study Agreement Form - Appendix 13/19/2020 15:37
- Interconnection Request Form - Appendix 1 - Independent Study and Fast Track2/22/2023 14:58
- Independent Study Process Eligibility3/03/2023 11:29
- Interconnection Request Form - Appendix 1 - Modifications, Repowers and Conversions2/23/2023 15:11
- Site Exclusivity Demonstration Form3/03/2023 11:02
- ISO as an Affected System Study Request5/26/2022 09:34
- Sample - Interconnection Request Form - Appendix1 - Independent Study and Fast Track3/31/2020 09:03
- Generating Facility Data - Attachment A to Appendix 1
- Flat Run Test and Bump Test Plot Instructions3/28/2019 10:25
- Generating Facility Data - Sample - Solar and Battery
- Generating Facility Data - Sample - Wind
- Prohibited Project Names3/13/2023 12:02
- Upgrade and Cost Responsibility Implementation11/27/2019 09:50
- Deliverability Transfer Request Form11/21/2019 13:31
- Evaluation of Generator Reactive Capability - White Paper9/02/2021 11:26
- Inverter-Based Interconnection Requests (IBR) Dynamic Model Review Guideline10/07/2021 10:10
- ISO Inverter-Based Model Validation Procedure1/17/2023 09:59
- Modification Request Form1/30/2023 13:15
- Guidance for Interconnection Customers Submitting Technical Data2/14/2023 15:32

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Process and requirements

The California 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.