![]() |
Path 46, also called West of Colorado River, Arizona-California West-of-the-River Path (WOR), is a set of fourteen high voltage (500 kV & 230 kV) alternating-current transmission lines that are located in southeast California and Nevada up to the Colorado River. [1] [2]
This power transmission system has a capacity of 10.6 gigawatts from east to west, and sends electric power to Southern California's massive population centers of Los Angeles and San Diego from many different sources, including hydroelectric dams (Hoover Dam on the Colorado River), nuclear plants (Palo Verde Nuclear Plant, near Phoenix, Arizona), and more recently, utility-scale solar plants (Ivanpah Solar Power Facility) [2] [3]
Supporting system (230 kV only):
Southern System (500 kV only):
Northern System:
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. [6]
This power line, maintained by San Diego Gas & Electric (SDG&E), begins at the Imperial Valley substation located northwest of Calexico 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 Western US power grid to Baja California, Mexico's power grid. [3] Leaving the substation, the line travels parallel at a distance to the south of Interstate 8 as both head east through Imperial Valley. Just past the Hwy 98 interchange with Interstate 8 southeast of El Centro, the line then runs adjacent to Interstate 8, as infrastructure bunches up to cross the shifting sand dunes. For the next 10 miles (16 km), the line is squeezed tightly between Interstate 8 and the US-Mexico border until both turn northeast. As Interstate 8 crosses over the All-American Canal, the line spans over and departs the freeway, continuing to the northeast. The line reaches the foothills north of Yuma and turns east. Abruptly, after crossing the Colorado River, the power line turns south and heads into the North Gila substation. Another 500kv line, Palo Verde – North Gila, connects the North Gila substation to the Palo Verde Nuclear Generating Station. The section of line east of the Colorado River is referred to as Path 49. [1] [6] [7]
Also called DPV1, this power line is owned and maintained by Southern California Edison (SCE). [8] Starting from the Devers substation northeast of the San Gorgonio Pass and north of Interstate 10, the line runs north of and roughly parallel to Interstate 10 as both head southeast and pass by Palm Springs. After dropping in elevation to near sea level in the Coachella Valley near Indio, both the line and Interstate 10 climb about 1600-ft out of the Coachella Valley and into Shavers Valley. Upon entering Shavers Valley, the line crosses over I-10 east of the Cactus City exit and continues to the south parallel with the freeway as both continue easterly across the Colorado Desert region of the Sonoran Desert. Both pass Chiriaco Summit and Desert Center with the line never more than 1.5 miles south of the freeway. About 5 miles after passing the Chuckawalla Valley State Prison, the line leaves the freeway and turns south-east for a few miles before turning east in the Palo Verde Valley and crossing the Colorado River south of Blythe. Like the North Gila – Imperial Valley line, the section of this power line east of the Colorado River is also referred to as Path 49. The power line eventually terminates at the Hassayampa switch yard substation adjacent to the Palo Verde Nuclear Generating Station along with the North Gila – Imperial Valley line mentioned above. [1] [7]
A second 500-kV transmission line to be called Devers – Palo Verde No. 2 (DPV2) is planned to run parallel to the existing Devers – Palo Verde line.
Starting from the Lugo substation in Hesperia, this 500 kV power line heads generally northeast along with the El Dorado – Lugo 500 kV line and two other 230 kV power lines. Both lines cross vast expanses of desert and mountains as they head towards Nevada. Just south of Interstate 40, the Mohave – Lugo line splits from the Eldorado – Lugo line; the Mohave line turns and heads in a more easterly direction than the other power lines. The line roughly parallels Interstate 40 at a large distance up to the California border. The power line then heads northeast to the Mohave Power Station at Laughlin, Nevada. The line terminates there along with another SCE 500 kV line from Eldorado substation. [1] [7]
The Eldorado – Lugo 500 kV line follows the same exact path as the Mohave – Lugo 500 kV until south of Interstate 40. The line then continues northeast through the Mojave desert along with other 230 kV power lines. Although the power lines generally parallel Interstate 15 through the Mojave desert, they do so at a very large distance and are completely out of sight. As the set of power lines leaves California and enters Nevada, they rises to an elevation of 5,000 feet (1,500 m) before turning to head north-northeast and descending into Eldorado Valley. The 500 kV power line then joins two other SCE 500 kV powerlines, one from the Mohave Power Station in Laughlin, and the other an SCE-built extension of Path 49 from Moenkopi Substation in central Arizona. All three lines terminate at the Eldorado substation, which is connected to the nearby McCullough and Marketplace substations via Path 62. [1] [7]
Both McCullough – Victorville 500 kV power lines are maintained by Los Angeles Department of Water and Power (LADW&P) and leave the Victorville substation heading northeast along with the Hoover – Victorville 287 kV line. The Intermountain 500 kV DC power line also joins the group of three power lines a short distance later. After crossing the Interstate 15 for the first time north of the Dale Evens Parkway interchange, the lines turn and head in a more easterly direction to avoid the Barstow area. The lines then cross the Interstate 40 just east of Daggett for their only time and then cross over Interstate 15 again. The set of four power lines generally parallels Interstate 15 at a distance to the north of the highway for the rest of the path in California. The Marketplace – Adelanto 500 kV power line joins the group of four power lines north of Newberry Springs for a short distance before it turns away eastward and follows Interstate 15 closely instead. After the lines pass Clark Mountain to the north, they enter Nevada adjacent to Primm and Interstate 15. At Primm the group of power lines, along with the Marketplace – Adelanto line which has come back, split and spread out across the desert, with lines spanning over each other. After crossing some mountains, the McCullough – Victorville and the Hoover – Victorville 287 kV lines reunite and terminate at the McCullough substation, while several other lines bypass the substation and terminate in other locations, such as the Intermountain line. [1] [7]
The Marketplace – Adelanto line (formerly path 64) originates at the Adelanto substation (where two 500 kV lines from the San Fernando Valley and another from Victorville terminate) west of the Victorville substation in the High Desert. [9] [10] This same substation is also the southern terminus of the Intermountain HVDC line at the Adelanto Converter Station. As this 202-mile (325 km) 500-kilovolt line leaves the substation, it heads north and parallel with U.S. Route 395 for a while. [1] [7] At Kramer Junction (intersection with State Route 58), the line turns east. The power line then meets the other Path 46 power lines from Victorville along with the Intermountain DC line near Newberry Springs and runs parallels with them for a short distance; all of the lines at this point are now heading northeast. After a few miles, the line crosses over the other Path 46 and Intermountain DC lines and splits off of the corridor; heading towards the Interstate 15 where it runs alongside the highway through the desert until both descend into the Ivanpah Valley. Just prior to the California-Nevada border, the Path 64 line crosses the Interstate 15 once more before turning north and entering Nevada southeast of Primm where it rejoins with the Path 46 and Intermountain lines again north of the community. The now scattered power lines then head in a roughly northeast direction across the desert to the Eldorado - Marketplace - McCullough substation complex. Path 64 ends at the Marketplace substation, where Path 63, another long-distance transmission line from Arizona also terminates. [9] [4] [5]
This power line is operated by Los Angeles Department of Water and Power (LADWP). This line, along with Path 27, the Intermountain DC line and other Path 46 powerlines, supply over 10,000 megawatts of electrical power to the Los Angeles area. Path 64 is an essential line for powering Los Angeles. [5]
The entire Path 46 system has a capacity of transmitting 10,623 megawatts (about 10 gigawatts) from east to west. It has no rating to transfer power from west to east and historically this never happens. It sends electric power to the cities of Southern California such as San Diego, Los Angeles, San Bernardino, Santa Ana, Temecula, Riverside and Bakersfield. [3] [11] The sources of electricity are from hydroelectric dams (like Hoover Dam) on the Colorado River, fossil fuel plants (like the Chuck Lenzie Generating Station in North Las Vegas, Nevada), nuclear energy (like the Palo Verde Nuclear Plant), and more recently, utility-scale solar plants (such as the Ivanpah Solar Power Facility and the Desert Sunlight Solar Farm). [1] [2]
A new 500 kV line called Devers – Palo Verde No. 2 (DPV 2) proposed by Southern California Edison (SCE) was 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-mile (370 km) 500 kV line will follow the existing Devers – Palo Verde – 500 kV from Devers substation in the San Gorgonio Pass near Palm Springs in California to the Harquahala Generating Station (near the Palo Verde Nuclear Generating Station) in Arizona and will cost $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 Greater Los Angeles area, which is enough to power 780,000 homes. [8] [12] [13] [14]
In June 2007, the Arizona Corporation Commission rejected SCE's application for the line expansion. SCE then appealed to the FERC, and is currently working directly with ACC to find a solution. Construction on the California portion of the line could begin in 2009, but Arizona is not expected to respond before the end of 2009. [15] [16]
In 2011, Southern California Edison began construction on a second line anyway between their Valley Substation in Romoland, CA and the new Colorado River Substation near the Chuckawalla Valley State Prison, west of Blythe, which went into service in 2013. This has some use since 750MW of renewable energy generating capacity was being added in the region. [17] [18] A second line continuing into Arizona was not included in Arizona Public Service's most recent (2014) plan, which covers planning up to 2023.
Both Devers – Palo Verde 500 kV lines are now split into 5 different sections. Devers – Red Bluff 500 kV lines #1 and #2, Colorado River – Red Bluff 500 kV lines #1 and #2, and the Colorado River – Palo Verde 500 kV line. The Colorado River and Red Bluff substations facilitate different solar projects in the area and allow the opportunity to transmit into each station at 230 kV (known as 220 kV within Southern California Edison) or lower voltages and step up to the 500 kV system. There are Series Capacitor stations between Devers and Red Bluff (known as "Cal Caps") and in between Colorado River and Palo Verde (known as AZ Caps).
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. [19]
On October 21, 2007 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. [20]
The 2011 Southwestern United States blackout that began on September 8, was a widespread power outage which affected parts of western Arizona, northern Baja California, and Southern California. A mistake by an Arizona Public Service employee at the North Gila substation resulted in the loss of a 500 kV line supplying San Diego Gas & Electric's North Gila-Imperial Valley segment on the Southwest Power Link [21] causing one of the largest power outages in history for the Southern California region. [22] Had the utilities affected realized the consequences to the loss of this line, they would have taken steps to eliminate the vulnerability. On April 27, 2012, the Federal Energy Regulatory Commission and the North American Electric Reliability Corporation released their report detailing the blackout and its causes. [23] Most of the areas affected were served by San Diego Gas & Electric Company, and left more than 5 million people without power. [24]
[page 4-6, & 4-9] Path 46: West of Colorado River (WOR) Location: Southern Nevada and Arizona/ Southern California Definition: Sum of the flows on: Fourteen various 500 kV & 230 kV Lines Export Transfer Limit: 10,623 MW Export out of Nevada & Arizona into Southern California Import Transfer Limit: Not Rated
The day after the largest power failure in California history left millions in Southern California, western Arizona and northern Mexico without electricity during one of the hottest weeks of the year, local and federal officials promised Friday to investigate the cause.
Blythe is a city in eastern Riverside County, California, United States. It is in the Palo Verde Valley of the Lower Colorado River Valley region, an agricultural area and part of the Colorado Desert along the Colorado River, approximately 224 miles (360 km) east of Los Angeles and 150 miles (240 km) west of Phoenix. Blythe was named after Thomas Henry Blythe, a San Francisco financier, who established primary water rights to the Colorado River in the region in 1877. The city was incorporated on July 21, 1916. The population was 18,317 at the 2020 census.
Adelanto is a city in San Bernardino County, California, United States. It is approximately 9 miles (14 km) northwest of Victorville in the Victor Valley area of the Mojave Desert, in the northern region of the Inland Empire. The population was 38,046 at the 2020 census.
The Pacific DC Intertie is an electric power transmission line that transmits electricity from the Pacific Northwest to the Los Angeles area using high voltage direct current (HVDC). The line capacity is 3.1 gigawatts, which is enough to serve two to three million Los Angeles households and represents almost half of the Los Angeles Department of Water and Power (LADWP) electrical system's peak capacity.
The Palo Verde Generating Station is a nuclear power plant located near Tonopah, Arizona, in western Arizona. It is located about 45 miles (72 km) west of downtown Phoenix. Palo Verde generates the most electricity out of any power plant in the United States per year, being listed as the largest power plant by net generation as of 2021. Palo Verde also has the third-largest rated capacity of any U.S power plant. It is a critical asset to the Southwest, generating approximately 32 million megawatt-hours annually.
Path 27, also called the Intermountain or the Southern Transmission System (STS), is a high-voltage direct current (HVDC) electrical transmission line running from the coal-fired Intermountain Power Plant near Delta, Utah, to the Adelanto Converter Station at Adelanto, California, in the Southwestern United States. It was installed by Asea, a company based in Sweden, and commercialized in July 1986. The system is designed to carry power generated at the power plant in Utah to areas throughout Southern California. It is owned and operated by the Intermountain Power Agency, a cooperative consisting of six Los Angeles-area cities, the largest member being the Los Angeles Department of Water and Power (LADWP), and 29 smaller Utah municipalities.
Path 15 is an 84-mile (135 km) portion 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 is part of The Western Electricity Coordinating Council's links of electrical intertie paths in the western United States.
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.
Path 26 is a set of three Southern California Edison (SCE) 500 kV power lines, located primarily in Los Angeles County, and extending into Kern and Ventura counties, all in California. Path 26 is part of the Western Electricity Coordinating Council's links of electrical intertie paths in the western United States. The Path 26 lines are located in: the San Joaquin Valley of the southern Central Valley; the Tehachapi Mountains and other central Transverse Ranges; and the Antelope Valley section of the Mojave Desert.
San Diego Gas & Electric (SDGE) is a regulated public utility that provides natural gas and electricity to San Diego County and southern Orange County in southwestern California, United States. It is owned by Sempra, a Fortune 500 energy services holding company based in San Diego.
Path 61 or the Lugo - Victorville 500 kV Line is a relatively short AC 500 kV power line that runs from Southern California Edison's (SCE) Lugo substation southwest of Hesperia to Los Angeles Department of Water and Power's (LADW&P) Victorville substation north of Victorville, California. Path 61 is part of the Western Electricity Coordinating Council's links of electrical intertie paths in the western United States.This line is an important connection between two out of the four parts that make up the massive Path 46 transmission system in southeast California since the line allows power flow to be rerouted on Path 46 when necessary. Half of the length of the 500 kV power line is owned by SCE to the south and LADW&P to the north. The entire line is located in the Mojave Desert and the High Desert regions of California.
Path 62 or the Eldorado - McCullough 500 kV Line is a short 0.6 mi (1 km) 500 kV power line linking Los Angeles Department of Water and Power's (LADWP's) McCullough substation to Southern California Edison's (SCE's) Eldorado substation in the Eldorado - Marketplace - McCullough substation complex just south of Boulder City, Nevada. Path 62 is part of The Western Electricity Coordinating Council's links of electrical intertie paths in the western United States. Like Path 61, this short, yet important 500 kV line allows for power flow to be rerouted on different 500 kV lines that make up the massive Path 46 transmission system when necessary. Power generated from Hoover Dam, and fossil fuel power plants in the Four Corners region is routed to this substation complex via many other 500 kV lines that connect to this substation complex.
The Intermountain Power Agency, located in Utah, is a power generating cooperative of 23 municipalities in Utah and 6 in California. It owns the Intermountain Power Plant near Delta, Utah, one of the largest coal-fired power plants in the United States. About 75 percent of the generated power is purchased by cities in southern California and the remainder is purchased by cities, cooperatives and Pacificorp in Utah and a cooperative in Nevada. The IPA also runs transmission lines to Mona, Utah, to Adelanto Converter Station in Adelanto, California and near Ely, Nevada.
The Mead substation is a major electric power interconnection point in the western United States. The station is located in the El Dorado Valley of Nevada just outside of Boulder City, at the end of Buchanan Boulevard south of its grade separation with Interstate 11. The facility is owned and operated by the Western Area Power Administration.
The 2011 Southwest blackout, also known as the Great Blackout of 2011, was a widespread power outage that affected the San Diego–Tijuana area, southern Orange County, Imperial Valley, Mexicali Valley, Coachella Valley, and parts of Arizona. It occurred on Thursday, September 8, 2011, beginning at about 3:38pm PDT, and was the largest power failure in California history.
The Palo Verde Valley is located in the Lower Colorado River Valley, next to the eastern border of Southern California with Arizona, United States. It is located on the Colorado Desert within the Sonoran Desert south of the Parker Valley. Most of the valley is in Riverside County, with the southern remainder in Imperial County. La Paz County borders to the east on the Colorado River.
The Colorado River is a major river of the western United States and northwest Mexico in North America. Its headwaters are in the Rocky Mountains where La Poudre Pass Lake is its source. Located in north central Colorado it flows southwest through the Colorado Plateau country of western Colorado, southeastern Utah and northwestern Arizona where it flows through the Grand Canyon. It turns south near Las Vegas, Nevada, forming the Arizona–Nevada border in Lake Mead and the Arizona–California border a few miles below Davis Dam between Laughlin, Nevada and Needles, California before entering Mexico in the Colorado Desert. Most of its waters are diverted into the Imperial Valley of Southern California. In Mexico its course forms the boundary between Sonora and Baja California before entering the Gulf of California. This article describes most of the major features along the river.
The Marketplace substation is a major electric power interconnection point in the western United States outside of Boulder City, Nevada. The station is in the Eldorado Valley.
Adelanto Converter Station in Adelanto, California, is the southern terminus of the 2,400 MW Path 27 Utah–California high voltage DC power (HVDC) transmission line. The station contains redundant thyristor-based HVDC converters rated for 1,200 MW continuous or 1,600 MW short term overload. The 300-acre (120 ha) station was completed in July, 1986 at a cost of US$131 million. The northern terminus of Path 27 is fossil fueled Intermountain Power Plant in Utah.
The TransWest Express Transmission Line Project (TWE) is a planned bipolar HVDC transmission line between the Chokecherry wind farm near Rawlins, Wyoming to a Marketplace substation near Boulder City, Nevada.
LS Power is an American independent power company that owns, operates, and develops power generating stations, storage facilities, and transmission lines. Founded in 1990, the company originally focused on developing and selling natural gas power plants, but has since expanded into developing renewable energy plants and transmission lines. The company's approach focuses on competing to win transmission line contracts at a lower price than established utilities and using its large asset portfolio to develop projects with "high barriers to entry." With a combined capacity of 2.3 GW of pumped storage hydropower and lithium-ion battery storage, LS Power has the largest non-utility owned energy storage portfolio in the United States.