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Reserve

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

Definition by PJM

Exhibit 6: Graphic Representation of Reserves

Exhibit 6: Graphic Representation of Reserves (from 1)

Source: 1 (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.

Last modified: 2025-06-22

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  1. PJM (2024). Manuals M-10: Pre-Scheduling Operations (Revision 45). https://www.pjm.com/-/media/DotCom/documents/manuals/archive/m10/m10v45-pre-scheduling-operations-11-21-2024.pdf ↩↩