Generator interconnection

A streamlined process for interconnecting generating facilities.

Interconnection generation process

The generation interconnection planning process helps power plants interconnect to the ISO grid. This page provides information and resources to help you understand and comply with requirements. Please note, the processes outlined below are from transmission-level resource interconnections, which need to follow ISO procedures, while distribution-level resources will follow their utility procedures.

Interconnection request and study

Resources connecting at the transmission level will follow ISO procedures explained in this section. New projects are required to complete a study process, starting with submitting an Interconnection Request. 
Transmission plan deliverability

Allocate or retain full or partial capacity deliverability status in a specified geographic or electrical area.
Contract development

After a resource has completed the study phase and provided the transmission plan deliverability, the customer executes the contracts, notably the generator interconnection agreement. 

Queue management

A project is required to meet the milestones and obligations established in its agreements and may also request modifications. Modifications require a request into the queue management processes.
New resource implementation

As the final step, projects need to enter and complete the New Resource Implementation process to ensure deliverables and activities needed prior to operation are complete. This will ensure successful integration into the ISO market systems and grid.

Learn more about interconnecting

The generator interconnection planning process provides a pathway for power plants to interconnect to the ISO controlled grid. We provide information and resources to help you understand and comply with requirements.

The Resource Interconnection Standards Fair presentation provides customers with information on the many facets of the interconnection application process - from the requirements, how to apply, and what to expect during the process. The last fair was held Sept. 17, 2024, see the event page for presentation and video recording. 

The New Scheduling Coordinator and Resource Owner Reference Guide is for scheduling coordinators and resource owners new to the resource implementation process. It contains helpful information, links and resources to assist with successful interconnection to the grid and participation in the wholesale power market.

ISO queue report and other project and study information

Download a report listing the current status of active, complete and withdrawn interconnection requests listed by study process, along with additional information of interest to interconnection customers and project procurement entities.

ISO generator interconnection queue

Select the Reporting tab to view Cluster 14 and prior Interconnection Queue reports.

View ISO queue reports
 

  • Cluster 15 Queue Report06/09/2025, 8:45 AM

    Cluster 15 Interconnection Requests data is published in the Queue Report above. Cluster 14 and prior interconnection information is located under the View Queue reports button above. 

Interconnection facility information

Energy storage meter considerations

The ISO and CPUC have various metering requirements for energy storage resources that are connecting to the grid that should be considered in the meter design phase of the project. As an example, the CPUC requirements require retail metering for station service if the battery is not charging or discharging.

Resources and documents

Many administrative resources are used throughout the interconnection process.

Accounting forms

In order for the ISO to refund unused funds from study deposits, it requires the Interconnection Customer to complete and provide a W-9 Form and Vendor Update Form on behalf of the legal entity that owns the project.

DocuSign

The ISO Interconnection teams utilize DocuSign for processing and requesting signatures. Here is a DocuSign User Guide and DocuSign Electronic Signature FAQs for reference and ease of use.

Related application(s) and access

The RIMS user guide is available on the application page.

Related ISO Tariff and Business Practice Manuals

The California ISO operates under the terms and conditions of its FERC-approved tariff. Business practice manuals 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.

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