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.
This procedure does not require any action from customers.
As of Aug. 15, load is expected to be around 140,000 MW for Sunday, Aug. 17.
PJM’s record summer peak is 165,563 MW, set in 2006.
On June 24 this summer, PJM served a preliminary peak of over 162,000 MW, the third-highest peak load in its history.
PJM has approximately 179,200 MW of generation capacity this summer, as well as approximately 7,900 MW of contracted demand response.
Demand response programs pay customers in advance to have their electricity use automatically reduced in times of system stress.
A dedicated team of operators uses sophisticated technology to balance supply and demand and direct the power grid 24/7 from PJM’s control rooms.
They prepare multiple potential scenarios that could be impacted by weather, emergency conditions or equipment failure.
They adjust resource output with changes in demand and ensure that no transmission lines or facilities are overloaded. The team also watches for unusual conditions and reacts to them to protect the electricity supply.
Click Here for the PJM announcement.
Previous Hot Weather Episodes
PJM previously issued Alerts this summer on--
-- June 19 to 26: Hot Weather Alerts
-- June 23 and 25: Hot Weather and Maximum Generation and Load Management Alerts
-- July 15-16: Hot Weather Alerts and Maximum Generation and Load Management Alerts
-- July 23: Hot Weather Alert for its Western region
-- July 24: Hot Weather Alert
-- July 25: Hot Weather, Maximum Generation and Load Management Alerts
-- July 26-27: Hot Weather Alerts in its Mid-Atlantic and Southern regions
-- July 28-29: Hot Weather, Maximum Generation and Load Management Alerts, Demand Response Implemented
-- July 30: Hot Weather, Maximum Generation and Load Management Alerts
-- August 17: Hot Weather
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:
PA Oil & Gas Industry Public Notice Dashboards:
-- PA Oil & Gas Weekly Compliance Dashboard - August 9 to 15 - Illegal Disposal Of 66,780 Gallons Of Conventional Wastewater; 4 Impoundments Not Restored; 3 Conventional Wells Mined Through [PaEN]
-- DEP Issued Violations To Iron Cumberland, LLC For Illegally Disposing Of 66,780 Gallons Of Conventional Well Plugging Wastes At Coal Refuse Disposal Area In Greene County [PaEN]
-- DEP: Conventional Well Plugging Operation Contaminates Spring In Allegheny County [PaEN]
-- The Derrick: PUC Judge Suspends Rhodes Estate Water Companies Litigation Schedule On Future Ownership [Fallout Continues From Conventional Oil Well Wastewater Spill In Venango County] [PaEN]
-- PA Oil & Gas Industrial Facilities: Permit Notices, Opportunities To Comment - August 16 [PaEN]
-- DEP Sets Sept. 17 Public Meeting/Hearing On Air Quality Permit For The Proposed 4.5 Gigawatt Natural Gas Power Plant At The Homer City A.I. Data Center Complex In Indiana County [PaEN]
-- DEP Invites Comments On Permit For 204 Aboveground Storage Tanks Totaling 1.3 Million Gallons At Proposed Amazon A.I. Data Center In Salem Twp., Luzerne County [PaEN]
-- DEP Posted 84 Pages Of Permit-Related Notices In August 16 PA Bulletin [PaEN]
Related Articles This Week:
-- In Case You Missed It -- A.I./Data Center Articles & NewClips From Last Week [PaEN]
-- Senate Hearing: To Communities Facing Rapid A.I. Data Center Development: Review Your Zoning Ordinance NOW, Before It's Too Late To Have Meaningful Siting, Mitigation Conversations [PaEN]
-- Senate Hearing: DEP Primer: Recurring Challenges Of A.I. Data Centers: Frequent Site Plan Changes, Inconsistent Zoning, Outdated Sewage Facilities, Limited Community Outreach [PaEN]
-- Senate Hearing: Susquehanna River Basin Commission - A.I. Data Centers Have A Dramatic Demand For Water, And The Potential To Be Among The Largest Water Consumers In The Basin [PaEN]
-- PJM Announces Fast-Track Stakeholder Process To Seek Solutions For Connecting Large-Load A.I. Data Centers To The Electric Grid; Aug. 18 Workshop [PaEN]
-- PJM Interconnection Issues Hot Weather Alert For Aug. 17 In Entire Service Area; 22 Hot Weather Alert Days So Far This Summer [PaEN]
-- Green Building Alliance To Provide Green Professional Operations & Maintenance Training To Pre-K To 12 School Facility Teams [PaEN]
-- Green Building Innovation Expo Set for Sept. 2 In Pittsburgh; Free Exhibit Hall [PaEN]
-- Explosion At US Steel Clairton Coke [Coal] Works Kills 2, 10 Injured; Search For Answers Beings At 109-Year-Old Plant With A History Of Fatal Fires, Air Pollution Violations [PaEN] [Compilation Of Articles]
-- Rep. Vitali: PA House Environmental Committee Examines Costs And Environmental Impacts Of Burning Waste Coal In PA
NewsClips:
-- Courier Times: Energy Transfer/Sunoco Making More Pipeline Repairs In Upper Makefield Twp. Where A Previous Leak Contaminated Water Wells; Township Says It Didn’t Know [PDF of Article]
-- Pipeline Safety Trust: Federal Pipeline & Hazardous Materials Safety Administration Quietly Weakens Safety Rules
-- Environmental Health Project Blog: The Health And Safety Risks Of Natural Gas, Natural Gas Liquids Pipelines
-- ABC27: Project To Upgrade Several Natural Gas Pipelines Underway
-- PUC Highlights National 8-1-1 Day To Promote Safe Excavation, Worker Safety
-- Observer-Reporter Guest Essay: PA Has A Chance To Reduce Pollution, Save Lives By Reducing Oil & Gas Facility Air Pollution - By Talor Musil, Environmental Health Project [PDF of Article]
-- Spotlight PA: More PA Government Agencies Turning To A.I. - Critics Say That’s Risky [Possible DEP Pilot For Permit Reviews]
-- WHYY: Electricity Bills Are Going Up In The Philly Region; Who’s In Charge Of The Grid, Anyway?
-- York Dispatch: Sen. Keefer (R) Wants Data Center Applicants To Show Their Energy, Water Needs: ‘Electric Bills Will Go Up Due To Supply. Why Would We Subsidize That To Lure Them In?’ [PDF of Article]
-- Scranton Times - Chris Kelly Opinion: The Pros And Con Artists Of A.I. Data Centers; 3-Hour Senate Hearing Like A 'Sales Seminar For Oceanfront Condos In Oklahoma' [PDF of Article]
-- Republican Herald - Chris Kelly: If Ya Can’t Buy ‘Em, Threaten ‘Em [A.I. Data Centers] [PDF of Article]
-- Kleinman Center For Energy Policy Blog: Americans Just Got Scammed On Their Electricity Bills; President Promised To Cut Electricity Prices By Half Within 12 Months On Campaign Trail - By Elea Castiglione, Research Assistant
-- NYT: Big Tech’s A.I. Data Centers Are Driving Up Electricity Bills For Everyone
-- Post-Gazette/WPost: Electricity Prices Are Surging, Opening Up New Line Of Attacks Against Republicans
-- PUC Hearings On Proposed Rate Increase For Wellsboro Electric (22%), Valley Energy Gas (19%), Citizen Electric (11%)
-- TribLive Letter: PJM Electricity Capacity Auction Proves Markets Work - By Glen Thomas, Fmr Chair, PUC
-- US EIA: Natural Gas Prices To Increase 34% From $3.20 to $4.30 Next Year Due To Increase In LNG Gas Exports
-- Bloomberg: BKV Corp. CEO: Increase In LNG Gas Exports Will Drive Natural Gas Prices Up
-- Utility Dive - Commentary: Why Utilities Must Rethink Natural Gas Procurement For A High-Demand Future
[Posted: August 15, 2025] PA Environment Digest
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