Requirements and Processes for Interconnection Projects

  • Please review our Queue Cluster (QC) 15 presentation: QC15 Presentation.
  • Please use this link to access the Grid Interconnection Processing Tool.
     
    • We are currently accepting new Wholesale Distribution Access Tariff (WDAT) Interconnection Requests and Rule 21 Non-Export requests in the tool. Please see the Rule 21 page for more information regarding submittal of Rule 21 Export requests.

For more information, please see the following section of our website: Grid Interconnection Processing Tool (GIPT) Information.

The information on this page is intended to help our customers understand the requirements and processes for interconnecting projects to SCE’s electric system.

You can navigate through the sections below or you can get started by reviewing our introduction to SCE’s Generator Interconnection Processes.

 

Announcements

  • On October 30, 2025, from 10-11am Pacific Time via Teams only, pursuant to a requirement in the WDAT storage settlement, SCE will hold a call to provide an update on the status of the implementation of SCE’s distributed energy resource management system (“DERMS”) as it pertains to energy storage.  If you have any questions, please contact Alexa Mullarky at Alexa.J.Mullarky@sce.com.  

    The relevant requirement in the settlement is the following:

    Reporting Obligations Related to Firm Window Service

    4.13. SCE is committed to exploring whether it can offer a service whereby a storage Resource can have a combination of Firm Charging Distribution Service and As-Available Charging Distribution Service that changes on an hourly basis (“Firm Window Service”). For the extent of the Moratorium, SCE will host a call once a year in the month of October to provide an update on the status of the implementation of SCE’s distributed energy resource management system (“DERMS”) as it pertains to energy storage. SCE will provide thirty days’ notice of this call to the Parties, shall post a notice on its website, and shall serve a notice on all then-current WDAT customers, including those in the queue, pursuant to the requirements for service under 18 C.F.R. § 35.2(e).

    Microsoft Teams Need help? 
    Join the meeting now 
    Meeting ID: 257 590 834 305 1 
    Passcode: XQ6q28d7 
    Dial in by phone 
    +1 213-297-0156,,172038460# United States, Los Angeles
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    Phone conference ID: 172 038 460#

     

  • WDAT Queue Cluster Window #16 (QC16) is anticipated to open on Thursday, October 1, 2026 and to close on Thursday, October 15, 2026. SCE may modify the dates based on CAISO’s Cluster study schedule.
  • Distribution Group Study (DGS) Application Window #21, Opening Date: Tuesday, September 2, 2025. Closing Date: Tuesday, September 30, 2025. For more information, view SCE’s Rule 21 page.
  • On August 14, 2024, SCE submitted its Order No. 2023 compliance filing with FERC in Docket No. ER24-2776. SCE requested an effective date of August 15, 2024. Accordingly, as of August 15, 2024, no WDAT Independent Study Process (ISP) Interconnection Requests will be accepted.
  • As of Wednesday, July 9, 2025, the California Public Utilities Commission directed SCE to allow generating customers the Limited Generation Profile (LGP) option. For more information on the LGP Interconnection Process, please navigate to the Rule 21 section of this site. Once in the Rule 21 section, expand the “Limited Generation Profile” menu item.
  • CAISO Queue Cluster application window pursuant to the CAISO Tariff Appendix DD: The Cluster Application Window will open on April 1 and close on April 15 of each year. If any date set forth is not a Business Day, then the applicable date shall be the next Business Day. If this website information differs from the CAISO Tariff or a CAISO market notice, the CAISO date shall prevail.
  • SCE is developing a plan to implement CAISO’s proposed immediate adjustments to Cluster 15 study schedule. Additional information will be provided when it becomes available. Please see Issue-Paper-and-Straw-Proposal-Interconnecton-Process-Enhancements-2023-Mar132023.pdf (caiso.com)
  • Presentation on Electrical Independence, Distribution Group Study, and Cluster Study Process dates is available here: February 15, 2024
  • On March 1, 2024, SCE implemented the interim methodology for assessing contribution to reliability network upgrades to evaluate projects under Rule 21 Screen Q and WDAT Section 5.5.1 (Interim Methodology).  SCE will review the applications on a first come, first served basis and apply the Interim Methodology in order by Queue Position.  Due to the very high volume of Rule 21 applications SCE has already received as of March 1, SCE will experience delays in timely processing the applications.  Pursuant to Section D.15 of SCE’s Rule 21 tariff, SCE will use Reasonable Efforts in meeting all the timelines provided under Rule 21 particularly as applicable to processing the pertinent Rule 21 Export application submissions.  However, SCE estimates it may take up to 20 business days in addition to the timelines set forth in Rule 21 to complete, including, but not limited to, processing applications, deeming the applications complete, engineering reviews, etc.  If additional modifications to the established timelines are necessary, SCE will further notify the customer as soon as practicable to provide an estimated completion date and the reason why additional time is needed.
  • Please see the Wholesale Distribution Access Tariff section of this website for information regarding tariff updates effective October 30, 2019
  • CAISO’s Distributed Generation Deliverability (DGD) Process. Information and prior years’ DGD allocation results are available on our page regarding Interconnections to the CAISO. Navigate and expand the following header for additional information: CAISO’s Distributed Generation Deliverability Assignment Application Window.

 

Generation Project Types

 

Rules and Regulations

 

Additional Information

 

Frequently Asked Questions (FAQs)

Many of your questions may have been answered in one of the following FAQs:

 

Contact Us

Should you have any questions regarding our interconnection processes, please reach out to either the Grid Interconnection and Contract Development (GICD) team or the Net Energy Metering (NEM) / Solar Billing Plan (SBP) team:

Grid Interconnection & Contract Development – Rule 21 Non-Export, Rule 21 Export, Wholesale Distribution Access Tariff (WDAT) and Transmission Owner Tariff (TOT)

Email: interconnectionQA@sce.com
Phone: (909) 274-1106
Mailing Address:
Grid Interconnection & Contract Development
Southern California Edison
2244 Walnut Grove Ave
Rosemead, CA 91770

Email Distribution List:
To subscribe to the GICD mailing list for notices about interconnection events, please email us.

 

Solar Billing Plan & Net Energy Metering – Customers who produce their own electricity through an eligible renewable distributed generation system on the Solar Billing Plan or Net Energy Metering (NEM) rate options. These rate options allow our customers to receive energy credits for the surplus electricity supplied to the electric grid.

Email: Customer.Generation@sce.com
Phone: (866) 600-6290
Mailing Address:
Southern California Edison
2244 Walnut Grove Ave
Rosemead, CA 91770

Email Distribution List:
To subscribe to the Customer Generation email list to receive notices about interconnection events and updates, please email us.

 

Rule 21 Ombudsman Information
To address disputes regarding Rule 21 missed timelines, please contact SCE's appointed ombudsman:

Rod Vickers, Project Manager
Email: Rule21.Ombudsman@sce.com
Phone: (714) 895-0211

 

DISCLAIMER: The guidelines in this section are provided with the intent to help SCE’s customers understand SCE’s Interconnection Procedures. However, in the case of discrepancies with SCE’s rules, such tariffs and regulations will prevail.