Connecting to the Grid
"Interconnecting" refers to the process of connecting a Distributed Generation (DG) system — such as wind, solar, battery or fossil fuel — to Mississippi Power’s Electric Distribution System for the purpose of parallel operation. Customers interested in connecting their DG system to Mississippi Power’s Electric Distribution System should follow the interconnection process outlined below.
Generally, Mississippi Power’s interconnection process is governed by the rules and procedures for your review below:
- Mississippi Public Service Commission’s Distributed Generation Rules
- Mississippi Power Distribution Generator Interconnection Procedures
- Southern Company Operation of Distribution Generator Interconnection Procedure in Parallel with the Distribution System Policy
- Mississippi Power Company’s Rules Governing Electric Service
Your interconnection request will be initially categorized as either a Level 1, 2 or 3 application based on the following criteria:
- Level 1: Inverter based systems 20 kW and less.
- Level 2: All systems over 20 kW but less than or equal to 2 MW, or non-inverter-based systems less than 2 MW.
- Level 3: All systems greater than 2 MW or not qualifying as Level 1 or 2.
Once you have selected an installer for your DG system, you can collaborate with them to initiate the application process with Mississippi Power. This process can be started by submitting an application using PowerClerk, Mississippi Power’s distribution interconnection online application portal. The developer typically places and manages the application on behalf of the customer as a courtesy. The customer is notified of the progress and next steps via email.
Level 3 applications will not be processed in PowerClerk. To initiate the process for Level 3, please download and complete the PDF application form and email it to MPCInterconnections@southernco.com for the next steps in the interconnection process.
Please note that it is the responsibility of the customer and/or the system installer to comply with any local building and electrical code requirements before beginning the installation of the DG system. After installation, the DG system should remain off until Mississippi Power has provided a Certificate of Completion via email. Upon receipt of the Certification of Completion from Mississippi Power, the customer can proceed with the parallel operation of their facility with Mississippi Power’s Electric Distribution System.
For any questions related to connecting to the grid, contact the Interconnections Team at MPCInterconnections@southernco.com or by phone at 1-866-677-0527, Monday - Friday / 8 a.m. - 5 p.m. Central Standard Time.
Application Overview (using PowerClerk)
PowerClerk is Mississippi Power’s online system for managing distribution interconnection requests. If you’re new to the system, click on “Apply Now” to watch the introductory video on the PowerClerk homepage. The video provides a comprehensive overview of the interconnection process.