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Regulatory Information - Open Access

Open Access Information

Transmission Owner Tariff - effective June 1, 2010


Wholesale Distribution Access Tariff (WDAT) Combined - effective May 28, 2010


Rule 21 Tariff - effective July 9, 2014


Overview of Generation Interconnection Process

Generation of energy requires a physical interconnection between the generator and the existing SCE Transmission/Distribution Grid. SCE will need to study your project and prepare an Interconnection Agreement between SCE and the generator. For projects at lower voltage levels (typically 66kV or less), the Wholesale Distribution Access Tariff will apply. Regardless, your first step is to submit a WDAT Application with technical data and a Distribution Service Application to SCE.


If your project is interconnecting at higher voltage (typically anything higher than 66kV), there is a similar, but distinct, process that is led by the California Independent System Operator who coordinates with SCE for projects in our region. Information for that process can be found in the CAISO's Tariff.

To sell your generation, or net it against your existing usage (net metering), you'll need to work with other groups at SCE or other agencies that wish to buy power. For net metering and related programs, click here. For power sales to SCE, click here for SCE Power Purchase Programs and the best Power Purchase Agreement for your project.

Cluster Application Window Schedule

Applicable to Generator Interconnection Requests Processed Under the Cluster Study Process

In accordance with SCE's WDAT Generator Interconnection Procedures (GIP), Cluster Application Windows will be opening (and closing) within the following schedule:

Anticipated Queue Schedule
Cluster Opening Date Closing Date
Queue Cluster 8 Application Window Wed Apr 01, 2015 Thu Apr 30, 2015

Interconnection Requests for processing under a Cluster Process must be submitted during a Cluster Application Window.

Rule 21 Distribution Group Study Application Window

In accordance with SCE's Rule 21 generator interconnection procedures, SCE will open a Distribution Group Study (DGS) Application Window within the following schedule:

DGS Application Window Schedule
Cluster Opening Date Closing Date
DGS Cluster 2 Mon Mar 2, 2015 Tue Mar 31, 2015

Interconnection Requests to be studied under the Distribution Group Study Process shall either be (a) an Independent Study Process Interconnection Request that passed screen Q and failed Screen R for which the Applicant elects to continue to the next available Distribution Group Study, or (b) an Interconnection Request submitted during a Distribution Group Study Application window that passes Screen Q. Please refer to Rule 21 for a description of Screens R and Q Rule 21 Link.

New Interconnection Requests for the Independent Study Process will NOT be accepted during the Distribution Group Study application window dates listed above.

Joint IOU Webinar Presentation on Distribution Group Study - August 26, 2014 (pdf)

Rule 21 Ombudsman Information

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

Diane Romeyko, Manager
Rule21.Ombudsman@sce.com
Ph: (626) 633-3003

Public WDAT-Rule 21 Queue

SCE- WDAT and Rule 21 Interconnection Requests (Excel)

Financial Security Forms

Contact Us

Should you have any questions regarding SCE's Open Access Information, please contact us via one of the following methods:

Email: interconnectionQA@sce.com
Phone: (626) 302-3688
Mailing Address:

Grid Interconnection & Contract Development
Southern California Edison
2244 Walnut Grove Ave
PO Box 945
Rosemead, CA 91770