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Interconnecting Generation under Rule 21

Electric Rule 21 describes the interconnection, operating and metering requirements for generation facilities to be connected to a utility’s distribution system, over which the California Public Utilities Commission (CPUC) has jurisdiction. Each of California’s large investor owned utilities (IOUs) has its own Rule 21 tariff as part of its electric rules; however, they are largely equal in content. For the latest news and regulatory developments on Rule 21, please visit the CPUC Rule 21.

The remaining information on this page serves as a reference for SCE’s Rule 21. The guidelines in this section are provided with the intent to help customers understand SCE’s interconnection procedures under Rule 21. However, in the case of discrepancies between the content of this page and SCE’s Rule 21, the currently approved Rule 21 will prevail.

Note that the currently posted Rule 21 at may not reflect updates to the tariff that may be pending before the CPUC.

Pursuant to the CPUC resolution E-4920 and E-4898 dated April 26, 2018, new interconnection requests will require UL-1741 SA certification with reactive power priority for smart inverters effective July 25, 2018. In addition, smart inverters must have the capability to perform Phase 3 Advanced Functions 5 & 6 effective February 22, 2019. It is the responsibility of the customer/installer/contractor to purchase equipment which meets all requirements including the new requirements adopted in E-4920 and E-4898. For more information, the California Energy Commission (CEC) has a website dedicated to the Rule 21 Smart Inverter Working Group or you may send an email to

Rule 21 Non-Export Interconnection Application Now Available Online

We are excited to introduce our new Non-Export Online Interconnection Application System for form 14-732. This will help facilitate a smooth and efficient application submittal.

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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.