DOE Extends Eddystone Power Plant Operations Through November as PJM Reliability Debate Continues
The U.S. Department of Energy has ordered PJM and Constellation Energy to keep two 380 MW units at Pennsylvania’s Eddystone Generating Station available through November 20, extending a series of emergency orders aimed at Mid-Atlantic grid reliability.
Microgrid Media Editorial Desk
Published · 4 min read
The U.S. Department of Energy issued a new emergency order on August 21 directing PJM Interconnection and Constellation Energy to keep Units 3 and 4 at the Eddystone Generating Station in Pennsylvania available through November 20, extending federal intervention at the plant as officials cite reliability concerns across the Mid-Atlantic power grid. The DOE Eddystone power plant order takes effect August 23 and prevents the two generating units from completing a retirement that was originally scheduled for May 31, 2025.
Units 3 and 4 each have 380 MW of generating capacity, giving the pair a combined 760 MW. The units can operate on natural gas or distillate fuel oil, and DOE has directed PJM to coordinate with Constellation to maintain their availability while using economic dispatch to minimize costs.
The latest order extends a series of federal interventions
DOE announced the latest Eddystone order on August 21, saying the action is intended to address what the department describes as critical grid-reliability issues in the Mid-Atlantic region.
The new directive follows an earlier order issued May 21 that required the same two units to remain available from May 25 through August 22. DOE has repeatedly used Section 202(c) of the Federal Power Act to extend Eddystone’s operating availability since the plant’s planned retirement.
DOE’s record for the previous 2026 Eddystone order shows that the department directed PJM and Constellation to maintain the units through August 22 before issuing the latest extension.
Eddystone’s remaining large units can burn natural gas or oil
The generating units covered by the order should not be confused with Eddystone’s retired coal units. Units 1 and 2, which historically burned coal, were retired in 2011 and 2012.
Constellation’s current Eddystone facility profile identifies Units 3 and 4 as subcritical steam boiler-turbine generators capable of operating on natural gas or oil. The company also operates four smaller oil-fueled peaking units at the site with a combined 60 MW of capacity.
That fuel flexibility can allow the two larger units to respond when PJM needs additional dispatchable generation, although keeping a plant available does not mean it will operate continuously. Actual dispatch depends on system conditions and the requirements imposed through the emergency order.
DOE and opponents disagree over the reliability case
DOE argues that retaining dispatchable generation is necessary as electricity demand increases and older generating resources retire. In announcing the August order, the department cited recent heat waves and its broader concerns about future resource adequacy.
The intervention remains contested. Consumer advocates and public-interest organizations have challenged earlier Eddystone orders, arguing that PJM previously determined the units could retire without creating a transmission reliability violation and that keeping them available imposes additional costs on customers.
The Citizens Utility Board and other consumer advocates estimated that an earlier 90-day Eddystone extension could cost PJM customers approximately $5.1 million and challenged DOE’s use of emergency authority.
Those arguments remain relevant to the latest extension because the federal intervention now continues for another roughly three months. The eventual costs associated with the new order have not yet been established in the sources reviewed.
The order comes as PJM faces accelerating load growth
The dispute is unfolding while PJM evaluates a rapidly changing supply-and-demand outlook. The regional transmission organization has repeatedly warned that generation retirements, lengthy interconnection timelines and accelerating electricity demand are tightening future reserve margins.
Data-center development is one important component of that demand growth, particularly in parts of the PJM footprint where large digital infrastructure campuses are seeking substantial new grid connections.
The DOE Eddystone power plant order represents one approach to the near-term reliability question: retain existing dispatchable generation that otherwise would have retired. PJM is simultaneously pursuing longer-term measures involving generation interconnection, transmission development, capacity procurement and rules for connecting large new loads.
The federal order remains legally contested
Section 202(c) gives the Secretary of Energy emergency authority to direct temporary electricity generation, delivery, interchange or transmission actions under specified emergency conditions.
Opponents of the Eddystone orders argue that repeatedly extending the plant goes beyond the temporary emergency role contemplated by the statute. DOE maintains that conditions in PJM justify continued intervention.
The dispute therefore extends beyond the economics of one Pennsylvania power plant. It raises a broader question about how emergency federal authority interacts with regional grid planning and generator-retirement decisions as electricity demand changes.
What happens next
The latest order begins August 23 and runs through November 20, 2026. During that period, PJM and Constellation must maintain the availability of Units 3 and 4 in accordance with DOE’s direction.
Keeping the units available does not establish how frequently they will operate, how much electricity they will generate or what the final cost to PJM customers will be. Those outcomes will depend on dispatch conditions, operating costs and implementation of the order.
Unless the federal government issues another extension or circumstances change, November 20 becomes the next major decision point for Eddystone’s two 380 MW units.
The Microgrid Media Editorial Desk reports on microgrids, energy storage, grid modernization, data center power demand, distributed energy resources, and energy policy. Reporting published under the Editorial Desk byline is developed from primary regulatory records, utility filings, government documents, company disclosures, and independently verifiable sources, and is reviewed under Microgrid Media’s editorial standards.
Editorial oversight: Jonas Muthoni, Editor-in-Chief
