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Connecting to Our Electrical System

Welcome to Southern California Edison Grid Interconnections

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.


  • Beginning Wednesday, December 18th, 2019, all new Rule 21 Non-Export Interconnection Requests will be processed using our new Grid Interconnection Processing Tool (GIPT).  A User Guide and Training videos are available to help new users.
            o For managing existing Rule 21 Non-Export requests, please continue to use Powerclerk (PCI).
  • WDAT Queue Cluster Window #13 ("QC13") Opening Date: Wednesday, April 1, 2020, Closing Date: Thursday, April 30, 2020.

Need assistance applying to QC13? You can get started by reviewing our introduction to SCE’s WDAT Queue Cluster 13 presentation. This presentation covers the Interconnection Request application form, sample Single-Line Diagrams, site/plot plans, tips on demonstrating Site Exclusivity, required deposits, study and other timelines, and updates to the WDAT applicable to energy storage projects.

Most of the Cluster Application details have not changed since QC12, but there are a few key updates for this year’s QC13 related to general application requirements and energy storage projects that you should familiarize yourself with if you plan on submitting an application for QC13.

Here are some of the changes for QC13:

  • WDAT tariff changes effective October 30, 20191
    • Added and modified definitions
    • New and modified sections for Charging Distribution Service for storage projects
    • SCE recommends that you review its WDAT tariff or additional changes
  • Revised Interconnection Request (“IR”) form (Appendix 1 to GIP)
  • IR form now includes distribution service information (Section 10)
    • Thus, neither a separate Distribution Service request nor a deposit is required
  • IR form now includes a new Section 11 in Attachment A “Storage System Information”
    • Thus, the “additional technical data form,” or BESS Form, is no longer required
  • For energy storage projects, Interconnection Customer must choose the type of Charging Distribution Service: Firm, As-Available, or None
  • IR form now includes new/modified boxes in Section 2 regarding increasing or modifying Charging Capacity
  • Additional Study Deposit is required for storage projects requesting Firm Charging Distribution Service ($20,000)
  • Cluster study timelines will add forty-five (45) calendar days for storage projects requesting Firm Charging Distribution Service

1 SCE submitted changes to its WDAT in FERC Docket No. ER19‐2505, which FERC accepted subject to refund, effective October 30, 2019, and set the proceeding for settlement. Following the conclusion of settlement procedures and final order from FERC, additional changes to the WDAT may be required, which could impact your proposed project.

  • Distribution Group Study (DGS) Application Window #12, Opening Date: Monday, March 2, 2020, Closing Date: Tuesday, March 31, 2020. For more information, view SCE's Rule 21 page.
  • 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.

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.