ComEd, a regulated subsidiary of Exelon Corporation, completed the livening of its 765‑kV Wilton Center substation on December 11, 2025, after announcing the milestone on December 12. The expansion increases the substation yard by 50 % to 1.5 million square feet and adds new 765‑kV circuit breakers, transformers, disconnect switches, surge arresters, and advanced protection and control equipment, positioning the facility to inter‑connect up to 2,450 MW of renewable generation with the PJM market beginning in 2026.
The project incorporates a 2.8‑million‑gallon detention pond for stormwater, reuses 80,000 tons of topsoil and 90,000 tons of on‑site clay, and expands the yard to accommodate the additional equipment and future upgrades. The 50 % yard expansion is the largest single expansion of a ComEd substation in the region, reflecting the company’s commitment to modernizing its grid infrastructure while minimizing environmental impact.
This expansion is a key component of Exelon’s $38 billion capital plan for 2025‑2028, which prioritizes transmission investments to support the company’s 19 + GW data‑center load target in the Mid‑Atlantic and Midwest. By adding capacity for large‑scale wind and solar projects, ComEd can deliver more than 2,000 MW of new renewable generation to the PJM zone, helping to reduce reliance on fossil‑fuel generation and put downward pressure on energy costs for residential and commercial customers.
ComEd President and CEO Gil Quiniones said the livening “marks a major milestone” and that the expanded capacity will “enable us to deliver more than 2,000 MW of new renewable generation through our transmission system to meet growing demands.” Exelon President and CEO Calvin Butler emphasized that the investment “supports our long‑term growth outlook and reinforces our focus on disciplined financial execution and infrastructure modernization.”
A minor upgrade planned for the second quarter of 2026 will complete the full 2,450 MW capacity, allowing the substation to fully support the largest cluster of utility‑scale wind and solar projects in the region. The upgrade will involve additional circuit breakers and control equipment, ensuring the facility meets evolving PJM market requirements and regulatory standards for renewable interconnection.
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