5CP (Five Coincident Peaks)

From June 1 through September 30, PJM tracks the highest hourly load of each business day across the whole RTO. The five biggest daily peaks are the coincident peaks, and a customer's average demand during those five hours becomes its Peak Load Contribution for the delivery year starting the following June. Weekends and NERC holidays are excluded by rule, and PJM publishes the official five in mid-October. Curtailing through the right five hours can save six figures per megawatt at current capacity prices.

See it live: today's peak call · stress-test the drivers