Microgrids for Developers


Understand Your Microgrid Options

Are you interested in deploying a microgrid in SCE territory? Find out what types of interconnections SCE supports and what’s required to properly install and establish your microgrid.

Interconnection Options for SCE Territories

Based on the current California Public Utilities Commission (CPUC) approved rules and regulations, customers and third parties can develop Behind-The-Meter (BTM) microgrids. The way your microgrid interconnects to the SCE electric grid will depend on your preferred method of operation and your project’s complexity, type of generation, and applicable tariffs.

Rule 21 Applications


This microgrid normally operates in parallel with the SCE grid and does not continuously export power back to the grid.

Isolated Operations

Composed of backup generation, this system operates on “isolated operation mode” and is not connected to the SCE grid. This system always requires an open transition to and from the grid and may include energy storage.

Momentary Parallel Operations

This system is composed of backup generation and may include energy storage, but the backup generation is not normally operational. When its backup generation function or energy storage is activated, it may connect in parallel with the grid for less than one second. After connecting, it then separates to provide backup service only to the facility.

NEM Interconnection with Eligible Paired Storage

Based on an NEM (Net Energy Metering) tariff that allows paired storage, this system normally operates in parallel with the SCE grid and provides energy to either power the microgrid or export energy to the grid in accordance to NEM tariff rules.

Application Process


Submit your application package and fee (if applicable). We’ll assign an engineer to your project to review the technical information.


After your application has been approved, you will need to demonstrate that your generator or energy storage complies with Rule 21 requirements where applicable.


After all inspections have been completed, you will receive a notification authorizing the operation of your generation system.

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Application Requirements

Why do we need Interconnection Agreements?

Here are a few of the reasons why Interconnection Agreements are critical to the continued safe and reliable operation of the electric grid.

  • Safety: Uncontrolled energy can be harmful to both people and equipment. California Title 8 (Safety Code) requires you to coordinate with SCE to help keep everyone safe.
  • Non-Discrimination: Access to the grid is available to all parties and customers, from small independent facilities to large commercial operations.
  • Stability and Reliability: Generators can impact grid operations and system planning. A streamlined process and agreements help ensure everyone is aligned.
  • Cost Responsibility: Depending on the interconnection process and rules applicable to your specific project, costs for network upgrades may be shared with other projects, and/or may be refundable. You will be responsible for any distribution upgrade and interconnection facilities costs that are unique to your specific project.
  • Compliance: You must follow applicable rules and regulations from the CPUC and SCE. These will vary depending on which interconnection option you choose.

Contact Us

Email: microgrids@sce.com
Phone: (626) 302-3688
Mailing Address:
Grid Interconnection & Contract Development
Southern California Edison
2244 Walnut Grove Ave
Rosemead, CA 91770

Want to get announcements about interconnection events?
Email: interconnections@sce.com

To address disputes regarding rule 21 missed timelines, contact:
SCE’s Appointed Ombudsman: Rod Vickers, Project Manager
Email: Rule21.Ombudsman@sce.com
Phone: (714) 895-0211

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Frequently Asked Questions


Join Us in Creating a Clean Energy Future

Microgrids often tap into renewable energy resources, which helps us get closer to our goal of a carbon-free future for California.

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