An entity appointed by a PJM member to do business in PJM on behalf of the member.

A group of more than one individual bus into a pricing node (pnode) that is considered as a whole in the Energy Market and other various systems and Markets within PJM.

An alternating current is the movement of an electric charge that periodically reverses direction. This is compared to the flow of electric charge in direct current, which moves in only one direction. [..]

A signal which, with respect to time, varies continuously in proportion to the measured quantity.

Ancillary services help balance the transmission system as it moves electricity from generating sources to ultimate consumers. PJM operates several markets for ancillary services: the Synchronized Res [..]

The measure of mismatch between the generation needed to meet load and what is actually supplying the load.

The amount of energy above “base case” conditions that can be transferred reliably from one area to another over all transmission facilities without violating any pre- or post-contingency criteria for [..]

The collection of generation, transmission, and loads within the metered boundaries of the Balancing Authority. The Balancing Authority maintains load-resource balance within this area.

An agreement between two entities (one or both being PJM Members) for the sale and delivery of a service.

Black Start Service enables Transmission Providers and Transmission Owners to designate specific generators called Black Start Units whose location and capabilities are required to re-energize the tra [..]