From Olinda Substation, the TANC 500 kV continues as a single-circuit line, although the tower structures change (see photos below) to a two-level pylon. The line proceeds south and then southeast along the western edge of the Sacramento Valley. It parallels Interstate 5 (about four miles (6.5 km) to the west) on its way south, although it's barely visible. It also parallels two 230-kV Pacific Gas and Electric lines for much of this segment and another WAPA 230 kV line. There is a series capacitor station near Maxwell in Colusa County to boost the line across the long Olinda-Tracy segment.