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.



SCE is preparing for the launch of a new, centralized billing system that will replace our current system in April 2021. Projects requiring a Meter Service Request (“MSR”) for Net Generation Output Meters (“NGOM”), Generation Meter Adapters (“GMA”), or new meter installation will experience a potential delay of 3 weeks for installation.

Please make note of these two important dates:

March 12th – The freeze period will begin; MSR’s will not be routed internally as of that date. Pending installations must be completed before March 17th; installation appointments will not be able to be scheduled during the freeze period.

April 6th – Anticipated go-live date. Cut-over period ends. New MSR’s can be generated and installation appointments can begin to be scheduled.

SCE strongly recommends contractors time their interconnection submittals to account for this rollout.



  • WDAT Queue Cluster Window #14 ("QC14"), Opening Date: Thursday, April 1, 2021, Closing Date: Friday, April 30, 2021
    • 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.

Need assistance applying to QC14? You can get started by reviewing our introduction to SCE’s WDAT Queue Cluster 14 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 tariff applicable to energy storage projects.

Most of the Cluster Application details have not changed since QC13, but there are a few key updates for this year’s QC14 related to general application requirements and energy storage projects that you should familiarize yourself with if you plan on submitting an application for QC14.

Here are some of the changes for QC14: 

  • WDAT tariff changes effective October 30, 2019 (See Footnote 1)
  • Added and modified definitions
  • New and modified sections for Charging Distribution Service for storage projects 
  • SCE recommends that you review the WDAT tariff for additional changes, including Attachment K, which describes rates for Charging Distribution Service. These rates were recently reduced per FERC order (174 FERC ¶ 63,021). (See Footnote 2) 
  • Revised Cluster Study Agreement (Appendix 3 to GIP) and Interconnection Request ("IR") form (Appendix 1 to GIP). The revised IR Form now includes: 
  • For energy storage projects, Interconnection Customer must choose the type of Charging Distribution Service: 1) As-Available Charging Distribution Service only; or, 2) Firm Charging Distribution Service only; or, 3) a combination of As-Available and Firm; or, 4) None (charging from onsite generation)
  • Distribution service information (Section 10). A separate Distribution Service request or a deposit is no longer required
  • New Section 11 in Attachment A, “Storage System Information.” The “additional technical data form,” or BESS Form, is no longer required

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

Footnote 2: On March 16, 2021, in Docket No. ER19-2505-003, FERC issued an order (174 FERC ¶ 63,021) approving the interim implementation of reduced rates agreed to in settlement, as well as certain other tariff changes. In the event that FERC does not approve a final settlement in this proceeding, then SCE will be entitled to reinstate its subject to refund rates retroactive to October 30, 2019, which could impact you

  • As of Wednesday, December 18th, 2019, all-new Rule 21 Non-Export Interconnection Requests are being processed using our new Grid Interconnection Processing Tool (GIPT).
    • A User Guide and Training videos are available to help customers with new functionality implemented on August 24, 2020.
    • If you have previously submitted requests via the PowerClerk tool(PCI), please continue to access those requests in PCI.
    • For Rule 21 Non-Export requests submitted in GIPT you will continue use GIPT throughout the lifecycle of your project.
    • The Interconnection Request fee is also being requested online via ACH payment using an ePay module within GIPT. More information is in the User Guide linked above or contact InterconnectionsQ& for payment questions.
    • For password assistance, please see the following: How to Reset Password.
  • Installing a Rule 21 Non-Export Energy Storage system sized less than or equal to 10kW?
  • Please see the Wholesale Distribution Access Tariff section of this website for information regarding tariff updates effective October 30, 2019
  • Distribution Group Study (DGS) Application Window #14, Opening Date: Monday, March 1, 2021. Closing Date: Wednesday, March 31, 2021. 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.