The Maximum Generation Alert is targeted at transmission, generation owners, who then determine if any maintenance or testing on equipment can be deferred or canceled.
By deferring maintenance, the units stay online and continue to produce energy that is needed to serve load within PJM.
Additionally, this alert provides notice to neighboring systems that electricity exports from PJM may be curtailed on May 19.
The alert serves as a procedural step that allows those neighboring regions affected to plan accordingly.
PJM issues this alert at the same time as a Load Management Alert, which gives advance notification that load management action may be declared, including non-Emergency and Emergency Demand Response.
Demand Response Call
PJM activated Demand Response customers in parts of the Mid-Atlantic and Dominion Energy on May 18 for Baltimore Gas & Electric, Dominion Energy and Potomac Electric Power Company.
The action is to address localized transmission constraints and to preserve the run-time of generators that will be needed for the hot weather and higher electricity demand expected over the next two days.
Demand response or load management customers are paid to reduce their electricity consumption to ease load during critical periods.
Low Voltage Alert
PJM also issued a Low Voltage Alert for May 19 across its region, which includes 13 states and the District of Columbia.
A Low Voltage Alert is an additional precautionary alert that does not require any action from customers.
The alert is issued to heighten awareness and increase planning, analysis and preparation efforts when high demand is expected in upcoming operating periods, allowing Transmission Owners ample time to coordinate with their distribution companies and take actions to increase voltages resulting in increased transfer capability across the RTO.
A Maintenance Outage Recall is in effect for Monday. The recall requests that all maintenance outages be returned to service by May 18 to increase the amount of generation available to meet customer demand.
Hot Weather Alert
The Hot Weather Alert issued last week has been extended to May 20 for the Mid-Atlantic and Southern Zones.
The Hot Weather Alert issued for May 19 was expanded to include all PJM zones, except the Commonwealth Edison territory in northern Illinois.
A Hot Weather Alert is a routine procedure PJM issues ahead of forecasted hot weather and/or high humidity to prepare transmission and generation personnel and facilities for expected increases in electricity demand, or load.
This procedure does not require any action from customers.
Forecast Peaks
PJM is forecasting a May 19 demand peak of 135,961 MW and a May 20 demand peak of 119,103 MW.
PJM’s planning for this summer includes unlikely but plausible scenarios of up to 169,100 MW of demand.
PJM’s all-time record summer peak load was recorded in 2006 at 165,563 MW.
Click Here for the PJM announcement.
The PJM Interconnection operates the electric grid in 13 states and the District of Columbia. The states include Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia and West Virginia.
Resource Link:
-- PJM Interconnection Prepared To Meet Summer Peak Energy Demands With Adequate Resources Under Expected Conditions [PaEN]
[Posted: May 19, 2026] PA Environment Digest
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