SASKPOWER OPEN ACCESS TRANSMISSION TARIFF

SASKPOWER OPEN ACCESS TRANSMISSION TARIFFtransfers. This interdependence is due to SaskPower internal system limitations.Saskatchewan - Manitoba Interfaces (MAPP)The Manitoba 230 kV interface consists of the three 230 kV transmission lines,designated P52E, R25Y, and R7B, which interconnect at the SaskPower stations ofE.B. Campbell, Yorkton, and Boundary Dam and the MHEB (Manitoba HydroElectricBoard) stations of Rall's Island, Roblin and Reston, respectively. This interface isconstrained by restrictions within Manitoba and SaskPower. The interface restrictions arenot typically circuit overloads, but are generally the result of low voltage or equipmentoverload conditions in the SaskPower system due to the loss of generation or parallelcircuits. The P52E and R7B transmission lines represent individual constrained paths thatare limited by the thermal capability (sag limit) of the lines.A second Manitoba interface consists of the two 110 kV lines from the Island Fallsstation in Saskatchewan to the Cliff Lake station in Manitoba. Currently, this interface isnot a constrained path. The energy delivered from Island Falls into the Manitoba 115 kVinterface is returned to SaskPower on the Manitoba 230 kV interface. This impact isaccounted for in the participation factors and is considered an “Existing TransmissionCommitment” for both interfaces.Saskatchewan - North Dakota Interface (MAPP)The North Dakota interface consists of the phase shifting transformer BD922T atSaskPower’s Boundary Dam station and the 230 kV line (B10T) between Boundary Damand the Tioga station in North Dakota. This interface is constrained by the transfercapability of the BD922T phase shifting transformer and by restrictions in the U.S., aswell as by SaskPower system restrictions. The SaskPower restrictions are generally theresult of low voltage or equipment overload conditions in the SaskPower system due tothe loss of generation or parallel circuits.Page | 115