Reserve

The generating capability that is “standing by” ready for service in the event that something happens on the power system.

Last Updated: June 22, 2025

Version: 1.0.0

Generated: November 06, 2025

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# reserve # system-operator # pjm

Definition by PJM

Exhibit 6: Graphic Representation of Reserves (from )

Source: p26, Revision 45

Reserves represent the generating capability that is “standing by” ready for service in the event that something happens on the power system, such as the loss of a large generator. (Reference NERC Performance Standard BAL-002-1, Disturbance Control Performance, and PJM Manual 12, Attachment D). The severity of the event determines how quickly the reserves have to be picked up. Exhibit 6 illustrates how PJM classifies the different types of reserve services.