Why Constellation Is Divesting
Constellation’s acquisition of Calpine created the largest power generator in the United States by total capacity. The combined entity’s market share in PJM triggered mandatory antitrust review by both FERC and the Department of Justice:
- Market concentration: The combined Constellation-Calpine portfolio held excessive market share in PJM’s Mid-Atlantic Locational Deliverability Areas (LDAs), particularly in the EMAAC and SWMAAC zones covering Pennsylvania, New Jersey, Delaware, and Maryland.
- Condition of approval: FERC and DOJ required Constellation to divest sufficient capacity to restore competitive market dynamics. The 4.4 GW sale to LS Power satisfies this obligation.
- No capacity loss: The divested plants remain operational under LS Power, an experienced independent power producer. Total PJM capacity is unchanged.
What’s Being Sold
- ~4.4 GW of gas-fired generation located in Pennsylvania and Delaware
- All plants are combined-cycle gas turbines (CCGTs) and peaking units that participate in PJM’s capacity and energy markets
- These assets are critical to summer peak reliability in the EMAAC region, particularly as coal retirements continue to thin the dispatchable fleet
What This Means for Commercial Buyers
- No immediate price impact: Since the plants remain operational, aggregate PJM supply doesn’t change. Your capacity charges reflect PJM-wide auction results, not individual plant ownership.
- Competitive dynamics shift: LS Power is an aggressive capacity market bidder. Their ownership of 4.4 GW of Mid-Atlantic gas capacity could influence future PJM auction clearing prices, especially if LS Power employs different bidding strategies than Constellation.
- M&A wave continues: This is part of a broader consolidation-and-divestiture cycle in US power generation. Vistra, AES, and NextEra have also reshuffled PJM portfolios in 2025-2026, driven by data center demand and record capacity prices.
- Long-term reliability: Monitor whether LS Power commits to the same maintenance investment cycles as Constellation. Deferred maintenance at newly acquired plants has historically led to increased forced outage rates — which directly affects capacity performance payments under PJM rules.
Source: Constellation Energy Corporation press release; FERC merger filings; U.S. Department of Justice; PJM Interconnection; Utility Dive.