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Path 15 is an portion〔(【引用サイトリンク】 Path 15 )〕 of the north-south power transmission corridor in California, U.S. It forms a part of the Pacific AC Intertie and the California-Oregon Transmission Project. Path 15, along with the Pacific DC Intertie running far to the east, forms an important transmission interconnection with the hydroelectric plants to the north and the fossil fuel plants to the south. Most of the three AC 500 kV lines were built by Pacific Gas and Electric (PG&E) south of Tesla substation. Path 15 consists of three lines at 500 kV and four lines at 230 kV. The 500 kV lines connect Los Banos to Gates and Los Banos to Midway. All four 230 kV lines have Gates at one end with the other ends at Panoche, Gregg, and McCall. There are only two connecting PG&E lines north of Tracy substation that connect Path 15 to Path 66 at the Round Mountain substation. The third line between Los Banos and Gates substation, south of Tracy, is operated by the Western Area Power Administration (WAPA), a division of the United States Department of Energy. This line was constructed away from the other two lines and is often out of sight. Most of the time the lines are in California's Sierra foothills and the Central Valley, but there are some PG&E lines that come from power plants along the shores of the Pacific Ocean and cross the California Coast Ranges and connect with the intertie. The Diablo Canyon Power Plant and the Moss Landing Power Plant are two examples.〔Route descriptions and tower designs are based on Google Earth images.〕 ==The route== The route is generally west of Interstate 5 from the Los Banos substation, west of Los Banos, to the Midway substation, near Buttonwillow. ;Connecting lines to Path 15 – Round Mountain to Los Banos substation The two connecting PG&E power lines start at Round Mountain substation at Round Mountain. The parallel PacifiCorp and PG&E lines north of Round Mountain are considered to be Path 66, not Path 15. These connecting lines to Path 15 will consist of two 500 kV lines until south of Tracy. Heading south, the lines run through the foothills of the northern Sierra Nevada mountains towards the Table Mountain Substation (39°33'26.57"N 121°38'40.23"W) northwest of Oroville. The lines head southeast from Table Mountain Substation; near the Sutter Buttes the two lines separate. One line heads almost due south, passing to the west of Sacramento and east of Davis. The other line continues southwest for some distance and then turns south and enters the Vaca-Dixon Substation along Interstate 505. The Vaca-Dixon substation (38°24'8.33"N 121°55'14.75"W) was the world's largest substation at the time of its inauguration in 1922. Just north of the Sacramento River and the city of Antioch the two lines rejoin and head in a south-southeasterly direction. The two PG&E lines span across both the Sacramento and San Joaquin Rivers on massive pylons along with the lone 500 kV Western Area Power Administration Path 66 line. Western's Path 66 line then turns east and runs parallel to the two PG&E lines to the west as all three lines head southeast. Both PG&E lines run to the west of the Clifton Court Forebay and cross Interstate 580 before entering the Tesla substation west of Tracy.〔name="GEImage"/>〔 Leaving the Tesla Substation (37°42'33.52"N 121°33'48.00"W) one PG&E line heads southwest and two parallel PG&E lines continue in a south-southeasterly direction along the eastern foothills of the Diablo Range and the western edge of the San Joaquin Valley. Only one of the two parallel lines heading southeast connects with Path 15, since one line serves as a connector to WAPA's Tracy Substation. This connector line abruptly turns north when a rare, tall dual-circuit WAPA line meets the two PG&E lines. The same dual-circuit line carries the third 500 kV line that joins the lone southeastward PG&E line. South of this point is where the 500 kV transmission system consists of three lines, not two. Despite being located in the eastern foothills of the Diablo Range, the two eastern lines cross a body of water - the O'Neill Forebay of the massive San Luis Reservoir (just to the east of the San Luis Dam) on several artificial islands.〔〔 The lone southwestward 500 kV PG&E line crosses the Diablo Ridge, rising to 808 m (2,650 feet) near Mount Hamilton.〔Google Earth elevation for GNIS coordinates.〕 The same line then heads into the Metcalf substation near San Jose and the Metcalf Energy Center. Leaving Metcalf substation, the line crosses the southern Santa Cruz Mountains with a 230 kV line and enters the large Moss Landing Power Plant substation in Moss Landing. The same line then heads east to rejoin the parallel PG&E lines at the Los Banos substation, effectively forming a 500 kV loop.〔〔 ;Path 15 – Los Banos to Midway substation South of the Los Banos substation (37° 3'7.69"N 121° 1'10.37"W) the three lines (two PG&E and one WAPA) continue to head southeast, with the lone WAPA line running to the west of the two parallel PG&E lines. The lines regroup as they enter the Gates Substation near Coalinga. The Los Banos-Gates third 500 kV line is the only WAPA-built section of 500 kV line in Path 15 and the third WAPA 500 kV line is also the only line with triple-bundled lines in Path 15.〔〔 Exiting the Gates substation (36°8'28"N 120°7'37"W), two parallel PG&E lines continue heading southeastward and one line heads southwest with a 230 kV line. This 500 kV line once again crosses the Diablo Range as it heads towards the Pacific Ocean. The line crosses Highway 101 in Atascadero and Highway 1 near Morro Bay. After crossing some rugged coastal hills, the line enters the Diablo Canyon Power Plant substation. Due to the massive amount of power generated by the plant, a second 500 kV line was built alongside the first, as the parallel lines head east to form another 500 kV loop. These parallel lines cross Highway 101 north of Pismo Beach and traverse over some southern coastal mountains. After reaching a height of over 1,200 m or 3,937 feet,〔 the two parallel lines head down the arid foothills of the southern San Joaquin Valley and split up. The two lines rejoin just before entering the Midway Substation (35°24'23.68"N 119°27'7.99"W) near Buttonwillow. The other two eastern lines also head into the same substation from the north. Southern California Edison's (SCE) two Path 26 lines connect to PG&E's grid at the Midway Substation. A PG&E line heading southeast from Midway substation is the third line of Path 26, not Path 15. Eventually, this line is replaced with SCE towers.〔〔 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 15」の詳細全文を読む スポンサード リンク
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