If you are considering the option of connecting a generator to a utility's electric distribution system, you must meet certain requirements before moving forward. In general, this section applies to smaller generators (e.g., Residential Power Projects).
The Illinois Commerce Commission established Title 83 Illinois Administrative Code Part 466 (Electric Interconnection of Distributed Generation Facilities) to establish standardized applications and review procedures and agreements for customers wanting to connect generators of equal to or Less than 10 MVA in parallel to a utility's electric distribution system. A complete copy of Part 466 is available on the link provided below. The procedures for interconnection are divided into four levels as follows:
Generally speaking, DG facilities that are certified by nationally recognized testing laboratories and meet certain standards of the Institute of Electrical and Electronics Engineers (IEEE), Underwriters' Laboratory, and the National Electrical Code, may qualify for interconnection under an expedited review process provided for in Levels 1 - 3. An expedited review of the interconnection request under Levels 1 - 3 is available provided the proposed DG facility passes the screens outlined in Part 466 and does not require construction of facilities by ComEd to protect reliability and accommodate the interconnection of the DG facility. Please see Part 466 for specific qualification requirements (screens) for each interconnection level.
An application fee is charged for each interconnection application submitted. Applications received by ComEd without payment of the application fee will not be entered into the interconnection process for review by ComEd.
You may submit your application for Level 1 Distributed Generation Interconnection or Levels 2, 3 or 4 Distributed Generation online.
Questions? ComEd has assembled the answers to some
Frequently Asked Questions to provide guidance to common interconnection application inquiries.
A potential applicant may submit a formal written request form along with a non-refundable fee for a pre-application report on a proposed project at a specific site. ComEd will provide the pre-application data to the potential application within 20 business days after receipt of the completed pre-application report request form and payment of the $300 fee. The pre-application report produced by ComEd is non-binding and does not confer any rights; the potential applicant must file an application before it can interconnect with the ComEd system. Your completed pre-application and associated fees (in the form of a check or money order, only; do not send cash) should be sent to the following address:
ComEdAttn: Interconnection Services Department2 Lincoln Center, 9th FloorOakbrook Terrace, IL 60181Email our Interconnection Team
We strongly recommend completing the application process online, as ComEd is making an effort to reduce paper use and streamline the application process. However, printable, mailable forms are available:
If mailing in your forms, the completed application and associated fees (in the form of a check or money order, only; do not send cash) should be sent to the following address:
ComEdAttn: Interconnection Services Department2 Lincoln Center, 9th FloorOakbrook Terrace, IL 60181Email our Interconnection Team(630) 576-8158
This document provides guidance and technical standards applicable to Interconnection Customers planning to install and operate a generator interconnected to the ComEd distribution system.
Interconnection Guidelines (pdf)
The Distributed Generation Interconnection Map provides indicative information for interconnecting Distributed Generation (“DG”) facilities on ComEd's electric distribution system. This map shows the locations in ComEd service area where the following Part 466 “screens” may have been tripped:
Low-voltage network facilities include both spot networks and the low-voltage network grids that serve some buildings in downtown Chicago and Evanston. The low-voltage network grids are not mapped because they are typically co-located with non-network feeders. DG projects in these areas (highlighted in yellow on the map) are not prohibited, but are less likely to be eligible for “expedited review” under Levels 1 – 3 of the Part 466 process. Projects in the remaining areas of ComEd’s service territory (highlighted in green) are more likely to be eligible for “expedited review” under Part 466. The service areas of municipalities that are not served by ComEd are shown in white.
Although the information provided in the map is loosely based on Part 466, this map does not replace or in any way affect the DG interconnection review and approval process specified in the Part 466.
ComEd will provide periodic updates to the DG Interconnection Map. The date of the last update is indicated on the map. If you have feedback or questions, please
email the ComEd Interconnection Team.
To view ComEd's Interconnection Map, download the
KMZ file. You need
Google Earth™ installed on your computer to view the map.
Disclaimer: The information on this webpage is applicable only to distributed generation (DG) facilities that (a) operate in parallel with the ComEd distribution system and (b) are not subject to the interconnection requirements of either the Federal Energy Regulatory Commission or the applicable Regional Transmission Organization (currently PJM Interconnection, LLC (PJM)). Inquiries concerning all other DG facilities should be directed to PJM. The PJM interconnection requirements, business rules, costs and interconnection queue are wholly separate from those referenced on this webpage. Visit the