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substation. At times these lines (both the North Line and the South Line) carry power from both BPA and the Jackson Project and, in the event of outage or other emergency, might carry power to or from Puget Sound Energy. The Jackson Loop—including the South Line—is used to transmit electricity from other sources in addition to the Jackson Project, such as electricity from BPA and, under certain circumstances, Puget Sound Energy. The use of non-project power sources allows the PUD to service the Goldbar, Sultan, Woods Creek, and West Monroe substations and provide backup capability to PUD substations served by the Jackson Loop. This occurs, for example,when the Jackson Project is not generating or the loads exceed the powerhouse capacity at full generation. III. DISCUSSION The Commission should delete the South Line from the Project boundary because it is no longer a"primary line" for the Project. Section 3(11) of the FPA defines "project"to consist of, among other things, ". . . the primary line or lines transmitting power therefrom to the point of junction with the distribution system or with the interconnection transmission system. . . ." 16 U.S.C. § 796(11). A project's primary transmission line(s) are defined in Section 3(11) as the line or lines "transmitting power [from the hydroelectric project] to the point of junction with the distribution system or with the interconnected primary transmission system." The Commission has further refined the definition of a primary line to include only lines used solely to transmit power from the licensed project to load center, and without which there would be no way to 4