Southern California Edison's power grid is linked to PG&E's by the Path 26 wires that generally follow Interstate 5 over Tejon Pass. The interconnection takes place at a large substation at Buttonwillow. PG&E's and WAPA's Path 15 and Path 66, respectively, from Buttonwillow north eventually connect to BPA's grid in the Pacific Northwest. There are several other interconnections with local and out-of-state utilities, such as Path 46.