Aug. 23 Update: Hot Weather Alert Extended to Aug. 24 for PJM’s Western Region

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PJM has extended a Hot Weather Alert for its Western Region to Aug. 24 as hot and humid weather continues in that region. A Hot Weather Alert is currently in effect for Aug. 23 for the same region.

A Hot Weather Alert is a routine procedure PJM issues in anticipation of 90 degree weather and/or high humidity in order to prepare transmission and generation personnel and facilities for expected increases in electricity demand. Temperatures in PJM’s Western Region are forecast to exceed 90 degrees with high humidity.

The Western Region in PJM is made up of the following transmission zones and control areas:

  • American Electric Power (AEP Ohio, Appalachian Power, Indiana Michigan Power and Kentucky Power)
  • American Municipal Power Transmission
  • ComEd
  • Cleveland Public Power
  • Dayton Power & Light
  • Duke Energy Ohio and Duke Energy Kentucky
  • Duquesne Light Company
  • East Kentucky Power Cooperative
  • FirstEnergy South – aka Allegheny Power Systems (West Penn Power, Mon Power, Potomac Edison)
  • FirstEnergy West – aka American Transmission Systems, Inc. (Penn Power, Ohio Edison, The Illuminating Company and Toledo Edison)
  • ITC Interconnection, LLC
  • Ohio Valley Electric Corporation

As of 9 a.m. Aug. 23, PJM expects to serve a forecasted load of around 128,000 MW on Aug. 23 and around 131,000 MW on Aug. 24.

The forecasted summer peak demand for electricity is approximately 156,000 MW, but PJM has performed reliability studies at even higher loads – in excess of 163,000 MW. PJM’s current peak demand for this summer occurred July 27 and was 148,000 MW. The all-time recorded peak electricity demand on PJM was 165,563 MW on Aug. 2, 2006.

Original Story: Hot Weather Alert Issued for PJM’s Western Region for Aug. 23 (Posted Aug. 22)

PJM has issued a Hot Weather Alert for its Western Region for Aug. 23 as temperatures are expected to reach the mid-to-upper 90s with high humidity in that region.

A Hot Weather Alert is a routine procedure PJM issues in anticipation of 90 degree weather and/or high humidity in order to prepare transmission and generation personnel and facilities for expected increases in electricity demand. Temperatures in PJM’s Western Region are forecast to exceed 90 degrees.

The Western Region in PJM is made up of the following transmission zones and control areas:

  • American Electric Power (AEP Ohio, Appalachian Power, Indiana Michigan Power and Kentucky Power)
  • American Municipal Power Transmission
  • ComEd
  • Cleveland Public Power
  • Dayton Power & Light
  • Duke Energy Ohio and Duke Energy Kentucky
  • Duquesne Light Company
  • East Kentucky Power Cooperative
  • FirstEnergy South – aka Allegheny Power Systems (West Penn Power, Mon Power, Potomac Edison)
  • FirstEnergy West – aka American Transmission Systems, Inc. (Penn Power, Ohio Edison, The Illuminating Company and Toledo Edison)
  • ITC Interconnection, LLC
  • Ohio Valley Electric Corporation

A Hot Weather Alert remains in effect for the entire PJM footprint for Aug. 22 as parts of the region PJM serves are expected to have temperatures reach around 90 degrees. PJM is also coordinating with its neighboring grid operators as other regions experience excessive heat and ongoing high electricity demand.

As of 8 a.m. Aug. 22, PJM expects to serve a forecasted load across the RTO of around 125,000 MW on Aug. 22 and around 128,000 MW on Aug. 23.

The forecasted summer peak demand for electricity is approximately 156,000 MW, but PJM has performed reliability studies at even higher loads – in excess of 163,000 MW.

PJM’s current peak demand for this summer occurred July 27 and was 148,000 MW. The all-time recorded peak electricity demand on PJM was 165,563 MW on Aug. 2, 2006.

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. Read more about how PJM forecasts electricity demand on the PJM Learning Center.