Exelon Boosts Grid: Wilton, 765‑kV Line, FERC 2026

Exelon Boosts Grid: Wilton, 765‑kV Line, FERC 2026

Introduction
This week brought several tangible developments affecting Exelon Corporation (EXC) and its regulated utility footprint. ComEd energized a major Wilton Center substation expansion, Exelon and NextEra proposed a 765‑kV transmission corridor to move gigawatts across PJM, and FERC issued a rule easing data center colocation with generators. Each action shifts the operational and regulatory landscape for transmission, interconnection, and large-load customers—and directly informs investor expectations for EXC’s regulated growth and strategic positioning.

What Changed This Week: Key Events and Data

Wilton Center Substation Goes Live (Dec 12, 2025)

ComEd announced the “livening” of the expanded Wilton Center substation in Will County, Illinois. The upgrade increased yard capacity and added high‑voltage breakers, transformers, and modern protection/control gear. Critically, the site is now positioned to accept up to ~2,450 MW of renewable generation into PJM beginning in 2026—smoothing future interconnection queues and supporting large utility-scale solar and storage projects.

Exelon–NextEra Propose 765‑kV Transmission Corridor (Dec 8, 2025)

Exelon and NextEra Energy Transmission jointly proposed a roughly 220‑mile 765‑kV corridor crossing parts of Pennsylvania and West Virginia, a project recommended in PJM’s 2025 regional plan. Designed to carry on the order of 7 GW, the line aims to reduce congestion, lower transmission losses, and improve reliability across PJM zones. The proposal is now in the PJM approval pipeline with final decisions expected in early 2026.

FERC Rule on Data Center Colocation (Dec 18, 2025)

FERC adopted a policy facilitating direct colocation of large data centers alongside power plants, allowing some customers expedited physical access to generation without routing solely through traditional distribution systems. The ruling directs regional operators—especially PJM—to develop pricing frameworks and interconnection procedures for these arrangements. The change has potential to accelerate hyperscaler projects but also introduces new grid planning and rate considerations for utilities like Exelon.

Why These Events Matter for EXC Investors

Rate Base and Regulated Returns

Transmission assets and major substation work typically qualify for regulated returns. The Wilton Center expansion enhances Exelon’s ability to capture interconnection-driven investment and to support third‑party projects that, when paired with appropriate recovery mechanisms, can expand rate base. Similarly, an approved 765‑kV corridor would create a multijurisdictional asset stream with predictable recovery profiles—a positive for long‑term regulated earnings and credit metrics.

Interconnection Demand and Execution Risk

Concrete interconnection capacity—2.45 GW at Wilton and potential corridor throughput of ~7 GW—signals accelerating project demand from renewables and storage. Execution risk remains: timeline slippages, permitting hurdles, and cost allocation decisions at PJM can affect near‑term cash flow and capital pacing. Investors should watch upcoming PJM filings and Exelon’s capital guidance for updated timing.

Customer Access and Competitive Dynamics

FERC’s colocation policy accelerates non‑traditional customer access to generation. While large customers may gain cheaper, faster connections, utilities face the challenge of retaining on‑system load and recovering fixed costs. For Exelon, this may create new commercial offerings (e.g., co‑located microgrids, direct supply contracts) or pressure on traditional rate structures—both outcomes will affect revenue mix and capital allocation choices.

Practical Takeaways

• Near term: Monitor PJM approvals and Exelon rate‑case filings for timing and recovery mechanisms tied to the Wilton project and any 765‑kV approvals.
• Medium term: Successful execution of the transmission corridor could materially expand regulated earnings and strengthen Exelon’s infrastructure role in PJM.
• Regulatory watch: Track FERC implementation guidance and PJM pricing frameworks for colocation to assess potential load migration or new commercial revenue streams.

Conclusion

Last week’s developments are concrete and actionable: Wilton’s energization unlocks substantial interconnection capacity, the proposed 765‑kV corridor represents a major regulated investment opportunity, and FERC’s colocation rule reshapes how large loads access power. For EXC investors, the interplay of execution, regulatory approvals, and commercial responses to colocation will determine whether these items translate into durable earnings growth or introduce new competitive pressures. Close attention to PJM decisions and Exelon’s capital and rate‑recovery plans will be essential in the coming months.