Pepco Date PHI Approved Material Suppliers PDF 1.29.2026 Exelon Mid-Atlantic Interconnection Guidelines PDF 1.29.2026 Exelon Transmission Facility Interconnection Requirements PDF 1.1.2024 Approved Contractor Lists for Design and Execution PDF 2.18.2026 PHI Approved T&S Materials List PDF 7.5.2023 Exelon Utilities Transmission Bus Configuration Design Philosophy PDF 5.19.2021 PHI Technical Considerations for Generation Parallel Operations PDF 10.13.2016 PHI Operations and Modifications Requirements PDF 10.10.2011 Historical Standards: Exelon ZIP