July 22 Update: Hot Weather Alerts to Continue Through Weekend

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PJM has extended its Hot Weather Alerts through July 24 amid ongoing hot weather throughout the region.

A Hot Weather Alert helps to prepare transmission and generation personnel and facilities for extreme heat and/or humidity that may cause capacity problems on the grid. Temperatures are expected to go above 90 degrees with high humidity, which drives up the demand for electricity.

A Hot Weather Alert is currently in effect for the entire PJM footprint for July 22. As of 8 a.m. July 22, electricity use is expected to peak around 148,000 for July 22, around 143,000 for July 23 and around 142,000 for July 24.

The preliminary peak electricity use on July 21 was 146,268 MW, occurring between 5 and 6 p.m. (Eastern).

July 21 Update: Hot Weather Alert Extended

PJM has extended the Hot Weather Alert for its footprint through July 22 amid an ongoing heat wave throughout the region.

A Hot Weather Alert helps to prepare transmission and generation personnel and facilities for extreme heat and/or humidity that may cause capacity problems on the grid. Temperatures are expected to go above 90 degrees with high humidity, which drives up the demand for electricity.

A Hot Weather Alert is currently in effect for the entire PJM footprint for July 21. As of 10:30 a.m. July 21, electricity use is expected to peak above 149,000 MW for July 21 and around 148,000 MW for July 22.

The preliminary peak for electricity use on July 20 was 148,456 MW, occurring between 5 and 6 p.m. (Eastern).

Original Story (July 20): Hot Weather Alert Continues for PJM Footprint

PJM has extended its Hot Weather Alert for the entire region it serves through July 21 amid ongoing 90-degree temperatures throughout the region.

A Hot Weather Alert helps to prepare transmission and generation personnel and facilities for extreme heat and/or humidity that may cause capacity problems on the grid. Temperatures are expected to go above 90 degrees with high humidity, which drives up the demand for electricity.

A Hot Weather Alert is currently in effect for the entire PJM footprint for July 20. As of 8 a.m. July 20, electricity use is expected to peak around 149,500 MW on July 20 and around 149,000 MW on July 21, reaching PJM’s forecasted summer peak for 2022.

The preliminary peak for electricity use on July 19 was 142,515 MW, occurring between 5 and 6 p.m. (Eastern).

PJM has performed reliability studies at even higher loads than its expected summer peak of 149,000 MW – in excess of 157,000 MW. PJM has approximately 185,000 MW of installed generating capacity available to meet customer needs, with sufficient resources available in reserve to cover generation that is unexpectedly unavailable or for other unanticipated changes in demand.

Last year’s peak demand was also around 149,000 MW.

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.