PJM Extends Hot Weather Alert To June 26; Extends Maximum Generation Alert To June 25; Calls For Pre-Emergency Load Management Reductions In Demand Response Program

The PJM Interconnection has taken several additional actions to deal with the continuing extreme hot weather conditions throughout its electric grid operations area in 13 states-- including Pennsylvania-- and in the District of Columbia.

PJM served a preliminary hourly integrated peak load of 160,526 MW between 5 and 6 p.m. Eastern on June 23. This exceeds PJM’s summer forecast load of 154,000 MW and is the highest demand recorded on the PJM system since 2011.

Hot Weather Alert Extended

PJM has extended a Hot Weather Alert for its entire service area, which was initially scheduled to expire June 25, through Thursday, June 26.

A Hot Weather Alert is a routine procedure PJM issues ahead of forecasted 90-plus-degree weather and/or high humidity to prepare transmission and generation personnel and facilities for expected increases in electricity demand, or load.

Maximum Generation Alert Extended

PJM has extended the Maximum Generation Alert through June 25 requiring electric generation facility owners to generate the maximum amount of electricity to meet forecast demand.

The Alert does not require any action from customers.

Call For Demand Response

Around 1:00  p.m. on June 24, PJM declared a Pre-Emergency Load Management Reduction Action for activation between 3–4:30 p.m. throughout the PJM footprint to provide additional resources for the power grid.

Earlier, PJM declared a Pre-Emergency Load Management Reduction Action at approximately 1 p.m. June 23 for the Atlantic City Electric, Baltimore Gas & Electric, Delmarva Power, Dominion, Jersey Central Power & Light, MetEd, Penelec, PECO, Pepco, PPL and PSE&G transmission zones, calling on contracted demand response programs to provide additional resources for the power grid. 

These demand response programs compensate residential, commercial and industrial customers who have opted in to reduce their electricity use when dispatched. 

All participating customers have agreed in advance to the terms of these programs with their energy providers.

PJM noted in its summer outlook the possibility that these demand response programs would be needed to serve electricity demand.

Click Here for the PJM announcement.

Visit the PJM Interconnection website for more information.  PJM manages the electric grid across 13 states-- including Pennsylvania-- and the District of Columbia.

Resource Links:

-- Pennsylvania Power Outages - 11,298 Customers As Of 1:35 p.m.

-- PJM Issues Alert Requiring All Electric Generators To Operate At Maximum Output For Monday, June 23; No Customer Action Required At This Time  [PaEN]

-- PJM Issues Hot Weather Alert For Entire Service Area June 22-25, Electricity Use To Exceed Summer Forecast Peak, But Adequate Reserves Should Be Available  [PaEN]

Related Article This Week:

-- PUC Highlights Ways To Keep Cool, Conserve Energy, Reduce Strain On Grid During Prolonged Extreme Heat  

NewsClips:

-- WHYY: Thousands Of PECO Customers Still Without Power As Dangerous Heat Wave Intensifies

-- TribLive: Severe Heat Sends Numerous Residents To Hospital In Western PA

[Posted: June 24, 2025]  PA Environment Digest