PJM will begin pricing at a new interface near the Seneca pumped storage station in Warren County, Pa., beginning Feb. 1.

RTO officials said they expect to use the pricing point when the 451 MW Seneca plant operates in pumping mode. It will only be used to set locational marginal prices when off-cost generation is necessary to provide voltage support for the Seneca plant to pump. It is not an IROL (Interconnection Reliability Operating Limits) transfer interface.

The new interface is comprised mainly of the 230 kV buses and connected generation buses at Seneca, Glade, Forest, Elko and Shawville in the PN transmission zone. (See full interface definition.) Seneca was among 11 hydroelectric power stations LS Power agreed last year to purchase from FirstEnergy Corp.