Commonwealth Edison Technical Standards ComEd Engineering and Construction Approved Service Providers Project Developers need to contact ComEd directly to validate the accuracy of the approved contractor listing as qualifications are subject to change. Date Guidelines on Land Requirements for Interconnection Substations PDF 4.1.2024 Approved Contractor List PDF 10.1.2024 Approved Supplier List PDF 2.25.2025 Approved GeoTech Vendors PDF 5.23.2023 Approved Substation Contractor List PDF 4.27.2023 Document Date Exelon Transmission Facility Interconnection Requirements PDF 1.1.2024 Exelon Utilities Transmission Bus Configuration Design Philosophy PDF 5.19.2021 ComEd Interconnection Guidelines PDF 12.16.2021 The ComEd and PECO Transmission Facility Connection Document addresses the requirements for the interconnection to the transmission system within both the ComEd service territory in Illinois and the PECO service territory in Pennsylvania in line with the requirements of NERC Reliability Standard FAC-001. Additional Company standards/requirements as necessary to address site specific interconnection issues are available to the interconnecting customer upon request at any point during the interconnection process. Requests for interconnection to the ComEd/PECO distribution system are addressed in documentation that is available on the respective Company websites which may be accessed via the Exelon website.