Path 46

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Path 46, also called West of Colorado River, Arizona-California West-of-the-River Path (WOR), is a set of many high voltage electrical power transmission lines that are located in southeast California and Nevada up to the Colorado River.^[1] This power transmission system is essential to meet the electricity demands of Southern California's massive population centers like Los Angeles and San Diego. The massive system has three separate systems of power lines.^[2]

[edit] Individual power lines of Path 46

Supporting system (230 kV only)

• El Centro - Imperial Valley 230 kV
• Ramon - Mirage 230 kV
• Coachella - Devers 230 kV

Southern System (500 kV only)

• North Gila - Imperial Valley 500 kV
• Palo Verde - Devers 500 kV No.1

Northern System

• Marketplace - Adelanto 500 kV - although this line is called Path 64, it is part of Path 46.^[3]
• Eldorado - Lugo 500 kV
• Eldorado - Lugo 230 kV lines 1 & 2
• Mohave - Lugo 500 kV
• Julian Hinds - Mirage 230 kV
• McCullough - Victorville 500 kV lines 1 & 2
• Hoover - Victorville 287 kV

Note

Although the Intermountain HVDC line follows the route of the northern system (specifically, the Hoover - Victorville and McCullough - Victorville lines) the DC line is not considered part of Path 46. Instead, the line is a distinct path: Path 27.^[4]

[edit] Route of the 500 kV lines

North Gila - Imperial Valley (San Diego Gas and Electric)

The power line begins in the Imperial Valley substation located west of Mexicali between the United States-Mexico border to the south and Interstate 8 to the north. The same substation is also the northern end of Path 45, an international power transmission corridor linking the Californian power grid to the Mexican power grid.^[2] Leaving the substation, the line parallels Interstate 8 at a distance to the south as both Interstate and power line head east. At a certain distance to the east near the sand dunes, Interstate 8 parallels the line closely, as infrastructure bunches up to cross the shifting sand dunes. For the next 10 miles (16 km), the line is squeezed tightly between the US-Mexico border and Interstate 8, until both Interstate 8 and the power line turn northeast. As Interstate 8 turns east again to reach Yuma, the line spans over and abandons the freeway as the line continues to head northeast. The line reaches the foothills north of Yuma and heads east. Abruptly, as the line crosses the Colorado River, the power line turns south to head into the North Gila substation. Another line, Palo Verde - North Gila, connects this southern line to the Palo Verde Nuclear Power Plant. The section of line east of the Colorado River is referred to as Path 21.^[1][4][5]

Palo Verde - Devers No. 1 (Southern California Edison (SCE)), also called DPV 1^[6]

Starting from the Devers substation northeast of the San Gorgonio Pass and north of Interstate 10, the line parallels Interstate 10 as both freeway and power line pass by Palm Springs as both head southeast. After leaving Palm Springs, the freeway and power line turn to head east-northeast. In the middle of the Mojave Desert, the line spans over Interstate 10 and runs south of the highway for the rest of the route east to Palo Verde Nuclear Power Plant, eventually the line runs out of sight of the freeway as the lines spans over the Colorado River. Like the North Gila - Imperial Valley line, the section of this power line east of the Colorado River is Path 21. The very long power line eventually ends in the massive Palo Verde substation next to the nuclear power plant and with the southernmost line mentioned above.^[1][5]

Mojave - Lugo (SCE)

Starting from Lugo substation near Interstate 15, the 500 kV power line heads generally northeast along with the Eldorado - Lugo 500 kV line and two 230 kV power lines. Both lines cross vast expanses of desert and mountains as the head towards Nevada. Just south of Interstate 40, the Mojave - Lugo line splits from the Eldorado - Lugo; the Mojave line turns to head in a more easterly direction that the other 500 kV line. The line roughly parallels Interstate 40 at a large distance up to the California border. The power line then bends and heads northeast to the Mojave Generating Station near Laughlin, Nevada. The long power line terminates there along with a shorter SCE 500 kV line from Eldorado substation.^[1][5]

Eldorado - Lugo (SCE)

The Eldorado - Lugo 500 kV line follows the same exact path as the Mojave - Lugo 500 kV up until south of Interstate 40. From then on, the line continues northeast through the barren desert along with other 230 kV power lines. Although the power lines generally parallel Interstate 15 through the desert, it does so at a very large distance and thus, it's completely out of sight. As the set of power lines leaves California and enters Nevada, it rises to an elevation of 5,000 ft (1,500 m) before turning to head north-northeast and descending. The 500 kV power line then joins two other SCE 500 kV powerlines, one from the Mojave Generating Station, and the other an SCE-built extension of Path 21 from central Arizona. All three lines terminate in the Eldorado substation, which is connected to the nearby McCullough and Marketplace substations via Path 62.^[1][5]

McCullough - Victorville lines one and two (Los Angeles Department of Water and Power (LADW&P))

Both McCullough - Victorville power lines leave the Victorville substation heading northeast along with the Hoover - Victorville 287 kV line. The Intermountain DC 500 kV power line joins the group of three power lines a short distance later. As the power lines cross Interstate 15 for the first time, they turn and head in a more easterly direction to avoid Barstow. The lines then cross Interstate 40 for their only time and then Interstate 15 again. The set of four power lines generally parallels Interstate 15 at a distance north of the highway for the rest of the path in California. The Marketplace - Adelanto 500 kV power line parallels the group of four power lines for a short distance before the single line turns away and follows Interstate 15 closely instead. As the lines pass Clark Mountain to the north, they enter Nevada adjacent to Primm and Interstate 15. There the group of power lines, along with the Marketplace - Adelanto line that has come back, split and spread out through the desert, with power lines spanning over each other. After crossing some mountains, the McCullough - Victorville and the Hoover - Victorville 287 kV lines reunite and terminate in the McCullough substation, while several other lines bypass the substation and terminate in other locations, such as the Intermountain line.^[1][5]

Marketplace - Adelanto (LADW&P)

Main article: Path 64

The Marketplace - Adelanto line starts at the Adelanto substation west of the Victorville substation. The same substation is also the southern end of the Intermountain HVDC line at the Adelanto static inverter plant. As the line leaves the substation, it heads northwest along with U.S. Route 395 for a while before it turns east and then northeast as it meets the other Marketplace - Victorville lines and Interstate 15. The line follows the other Path 46 wires, diverges away and then Interstate 15 closely until the Nevada border, where the line abandons the freeway as the line heads east into the Marketplace substation.^[1][5]

[edit] Capacity and source of the electricity

The entire Path 46 system has a capacity of transmitting 10,100 megawatts or about 10 gigawatts of electrical power to the massive population centers of Southern California.^[2] The source of the electricity the lines carry is from hydroelectric dams (like Hoover Dam) on the Colorado River, fossil fuel plants (like the Mojave Generating Station in Laughlin), and nuclear power (like the Palo Verde Nuclear Plant).^[1][5]

[edit] Expansion

A new 500 kV line called Devers - Palo Verde No. 2 (DPV 2) proposed by Southern California Edison (SCE) has been approved by both the California Public Utilities Commission (CPUC) and California Independent System Operator (Cal-ISO) in the years 2007 and 2005, respectively. The new 230 mi (370 km) - 500 kV line will follow the existing DPV 1 - 500 kV from San Bernardino in California to the Harquahala Generating Station (near the Palo Verde Nuclear Plant) in Arizona and the line will cost USD$ 680 million to build. The new line and associated upgrades to the regional transmission system will bring an additional 1,200 MW of electrical power to the Los Angeles area, which is enough to power 780,000 homes. SCE expects the 500 kV line project to be complete in the year 2009 or 2010.^[6][7][8][9]

San Diego Gas & Electric has also proposed a new 500 kV power line, with its eastern terminus at the North Gila substation and several possibilities for the western terminus and route configuration.^[10]

[edit] Wildfire damage

On October 21, the Harris Fire, part of the California wildfires of October 2007, damaged and disabled an extension of the North Gila-Imperial Valley 500 kV line that heads into San Diego.^[11]

[edit] References

General

• Wecc.biz
• California Public Utilities Commission

Specific

[edit] External links

• Pictures of Path 46 on Interstate 15
• Picture of Path 46 on Interstate 40
• Pictures of Path 46 on Interstate 8 here and here