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California Oregon Intertie (COI), identified as Path 66 by Western Electricity Coordinating Council (WECC), is a corridor of three roughly parallel 500 kV alternating current power lines connecting the electric grids of Oregon and California. Their combined power transmission capacity is 4800 MW. Two of the power lines run from Malin Substation southeast of Klamath Falls, Oregon to Round Mountain Substation northeast of Redding, California. One of them is owned by Western Area Power Administration, the other by Pacific Gas and Electric and PacifiCorp jointly.〔 These lines are a part of Pacific AC Intertie and were completed in the 1960s. The third line runs from Captain Jack Substation near Malin to Olinda Substation south of Redding. It is a part of California-Oregon Transmission Project, the project manager is the Transmission Agency of Northern California (TANC), a joint venture of several public utilities. It was completed in 1993. ==Route== Path 66 is composed of one segment of TANC, PG&E and PacifiCorp 500 kV lines. The TANC line route starts at Captain Jack Substation (42° 4' 38.06"N 121° 23' 25.47"W) close to Malin, close to the California-Oregon border, near the Malin Substation, where the other 500 kV lines start (PacifiCorp & PG&E). These substations link to both the Pacificorp and Bonneville Power Administration (BPA) grid in the Pacific Northwest.〔Route descriptions and tower designs are based on Google Earth images.〕 ;Path 66 - Captain Jack to Olinda Path 66 consists of the northernmost segment of TANC's 500 kV line from Captain Jack substation to Tracy substation in California's Central Valley. Leaving Captain Jack substation, the line first heads southeast as a single-circuit line and runs parallel with the other two 500 kV lines across the Modoc Plateau. It then turns west and climbs in elevation and reaches its highest point near Grizzly Peak at about .〔Google Earth elevation for GNIS coordinates.〕 From there, it heads south, spanning over the Stonecoal Valley and the Pit River. Near Round Mountain, it turns southwest and the line is joined by two 230-kV lines as all three lines head into the Sacramento Valley. As the line passes by Cottonwood, it turns west and crosses Interstate 5. Near Olinda, it turns south and enters Olinda substation. Here the line interconnects with transmission lines carrying power from Shasta Dam and Keswick Dam.〔 ;Connecting wires to Path 15 - Olinda to Tracy (詳細は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 & 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.〔 The line crosses the two separated PG&E 500-kV lines, near Woodland and Rio Vista. Near Antioch the line turns and runs parallel with the two PG&E 500 kV lines. All three lines cross both the Sacramento and San Joaquin Rivers on very large pylons. The TANC line turns away from the PG&E lines and heads for another large substation near Tracy.〔 ;Connecting wires to Path 15 - Tracy to intersection with PG&E wire From Tracy Substation, the line again to a rare, tall, double-circuit 500 kV line suspended by a three-level pylon located in the San Joaquin Valley. The line terminates where it intersects with one of the two PG&E 500 kV lines as the PG&E heads south from the Tesla substation towards Los Banos Substation. The PG&E line that the dual-circuit line intersects used to be a second Los Banos-Tesla power line that was split apart. A PG&E tower was removed, although the foundation for the tower is still visible. New towers were built to accompany the line changes. One circuit turns north back into Tesla Substation, effectively linking the Tracy Substation with the Tesla Substation. The other circuit turns south to head for the Los Banos Substation as a southern extension of the third 500 kV line.〔 ;Path 66 - Malin to Round Mountain The other two 500 kV lines start in the Malin substation to the east of the Captain Jack substation. One circuit of a rare, tall BPA dual-circuit and one single-circuit 500 kV line connect Captain Jack substation with Malin substation. The PG&E and PacifiCorp 500 kV line both head south together across the Modoc Plateau, generally following the lone WAPA line at a distance. The parallel lines then turn southwestward climb to about 5,400 feet (1,645 m),〔 before descending and turning south once again. Both lines enter the Round Mountain substation. This is the terminus of the Path 66 portion of the parallel 500 kV wires.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Path 66」の詳細全文を読む スポンサード リンク
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