Markets & Operations

Transmission Service

PJM’s Open Access Transmission TariffPDF specifies the transmission services that are available to eligible customers. Customers submit requests for transmission service to PJM through the Open Access Same-Time Information System (OASIS). PJM evaluates each transmission-service request for its impact on the system and approves or denies the request accordingly.

There are two major types of transmission service under the tariff: point-to-point service and network service.

Point-to-Point Transmission Service uses the PJM system for the transmission of capacity and energy between a point of receipt and a point of delivery which can be into, out of or through the PJM Control Area.

PJM offers firm and non-firm point-to-point transmission service for various terms.

Firm service has reservation priority over non-firm point-to-point service.

Non-firm point-to-point transmission service is provided from the available transmission capability beyond network and firm point-to-point transmission service.

Network Transmission Service (PJM Network Integration Transmission Service) is used for the transmission of capacity and energy from network generating resources to PJM network loads.

Network transmission service enables network customers to use their generation resources to serve their network loads located in PJM. Network customers also can use the service to deliver economy energy purchases to their network loads.

PJM works with transmission owners to plan and coordinate the operation, maintenance and expansion of PJM transmission facilities in order to provide all network and point-to-point customers with transmission service.

PJM’s Transmission Service Request Manual (M02) provides detailed information about the types of transmission service, how requests are evaluated and how PJM calculates available transfer capability.

The Regional Practices Guide contains detailed information about business rules and practices related to transmission reservations, energy scheduling and ancillary services. The guide identifies the specific steps necessary to request various types of transmission service. The guide is available on the OASIS information page.