| Jocassee Dam | |
|---|---|
| Country | United States |
| Location | Pickens/Oconee Counties, South Carolina |
| Coordinates | 34°57′36″N82°55′10″W / 34.96000°N 82.91944°W Coordinates: 34°57′36″N82°55′10″W / 34.96000°N 82.91944°W |
| Opening date | 1973 |
| Owner(s) | Duke Energy |
| Dam and spillways | |
| Type of dam | Embankment |
| Impounds | Keowee River |
| Height | 385 ft (117 m) [1] |
| Length | 1,800 ft (550 m) [1] |
| Reservoir | |
| Creates | Lake Jocassee |
| Total capacity | 1,185,000 acre⋅ft (1.462 km3) [2] |
| Catchment area | 148 sq mi (380 km2) [3] |
| Power Station | |
| Commission date | 1973–1975 [1] |
| Turbines | 4 [1] |
| Installed capacity | 710 MW (950,000 hp) [1] |
| Annual generation | 811 GWh (2,920 TJ) [1] |
Jocassee Dam (often called Lake Jocassee Dam) is an embankment dam on the Keowee River, straddling the border of Pickens and Oconee counties in South Carolina in the United States. The dam forms Lake Jocassee, which is fed by the Toxaway, Thompson, Horsepasture and Whitewater Rivers, and serves primarily for hydroelectric power generation and flood control. The dam and reservoir are part of the Keowee-Toxaway Hydroelectric Project, owned and operated by Duke Energy. [4] [5]
Completed in 1973, the dam is a zoned earth and rock fill structure, standing 385 feet (117 m) high with a crest length of 1,800 feet (550 m). At full pool, the reservoir has a storage capacity of 1,185,000 acre-feet (1.462×109 m3), [2] encompassing 75 miles (121 km) of shoreline and 7,500 acres (3,000 ha). Floodwater is released through a spillway controlled by two 40-by-32-foot (12.2 m × 9.8 m) gates, with a capacity of 45,700 cubic feet per second (1,290 m3/s). [3]
The dam supports a 710 megawatts (950,000 hp) hydroelectric station, generating power from four turbines. Two of the turbines were installed in 1973, while the third and fourth units came online in 1975. The power station functions as a pumped-storage operation designed to provide peaking power, and generates an average of 811 million kilowatt-hours (2.92×109 MJ) per year. [1] The dam is shown under construction in the 1972 thriller film Deliverance .
Oconee County is the westernmost county in the U.S. state of South Carolina. As of the 2010 census, the population was 74,273. Its county seat is Walhalla and its largest city is Seneca. Oconee County is included in the Seneca, SC Micropolitan Statistical Area, which is also included in the Greenville-Spartanburg-Anderson, SC Combined Statistical Area. South Carolina Highway 11, the Cherokee Foothills National Scenic Highway, begins in southern Oconee County at Interstate Highway 85 at the Georgia state line.
The Ludington Pumped Storage Plant is a hydroelectric plant and reservoir in Ludington, Michigan. It was built between 1969 and 1973 at a cost of $315 million and is owned jointly by Consumers Energy and DTE Energy and operated by Consumers Energy. At the time of its construction, it was the largest pumped storage hydroelectric facility in the world.
Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing. The method stores energy in the form of gravitational potential energy of water, pumped from a lower elevation reservoir to a higher elevation. Low-cost surplus off-peak electric power is typically used to run the pumps. During periods of high electrical demand, the stored water is released through turbines to produce electric power. Although the losses of the pumping process make the plant a net consumer of energy overall, the system increases revenue by selling more electricity during periods of peak demand, when electricity prices are highest. If the upper lake collects significant rainfall or is fed by a river then the plant may be a net energy producer in the manner of a traditional hydroelectric plant.
Hydroelectricity, or hydroelectric power, is electricity produced from hydropower. In 2020 hydropower generated one sixth of the world's electricity, almost 4500 TWh, which was more than all other renewables combined and also more than nuclear power.
The Bath County Pumped Storage Station is a pumped storage hydroelectric power plant, which is described as the "largest battery in the world", with a maximum generation capacity of 3,003 MW, an average of 2,772 MW, and a total storage capacity of 24,000 MWh. The station is located in the northern corner of Bath County, Virginia, on the southeast side of the Eastern Continental Divide, which forms this section of the border between Virginia and West Virginia. The station consists of two reservoirs separated by about 1,260 feet (380 m) in elevation. Until late 2021, it was the largest pumped-storage power station in the world.
Lake Jocassee is a 7,500-acre (30 km2), 300-foot (91 m) deep reservoir in northwest South Carolina. It was created in 1973 by the state in partnership with Duke Power. The lake is known for the clean and cold Appalachian mountain rivers that flow into it, keeping its waters cool and clear year-round. The Jocassee Dam, which forms the lake, is 385 feet (117 m) high and 1,750 feet (530 m) long. The lake is within Devils Fork State Park.
Carters Dam is an earthen embankment dam located south of Chatsworth in Murray County and west of Ellijay in northwestern Georgia, United States, that creates Carters Lake.
Muddy Run Pumped Storage Facility was built by the Philadelphia Electric Company and is a pumped-storage hydroelectric generation facility in Drumore Township, Pennsylvania, United States. When completed in 1968, Muddy Run was the largest pumped-storage facility in the world. The facility is operated by the Susquehanna Electric Company, a subsidiary of Constellation Energy. Ernest Spey was the superintendent of Conowingo Hydroelectric Dam and the new Muddy Run facility until 1989.
The Toxaway River is a 21.4-mile-long (34.4 km) waterway that flows south from headwaters in Transylvania County, North Carolina, into Lake Toxaway and over Toxaway Falls, after which it crosses into South Carolina and enters Lake Jocassee, the reservoir behind Lake Jocassee Dam.
The Whitewater River is a 14.6-mile-long (23.5 km) river that flows south from headwaters in Transylvania County, North Carolina, over Upper Whitewater Falls and Lower Whitewater Falls before crossing into South Carolina and entering Lake Jocassee, the reservoir behind Lake Jocassee Dam.
The Keowee River is created by the confluence of the Toxaway River and the Whitewater River in northern Oconee County, South Carolina. The confluence is today submerged beneath the waters of Lake Jocassee, a reservoir created by Lake Jocassee Dam.
Lake Keowee is a man-made reservoir in the United States in the state of South Carolina. It was developed to serve the needs of power utility Duke Energy and public recreational purposes. It is approximately 26 miles (42 km) long, 3 miles (4.8 km) wide, with an average depth of 54 feet (16 m), and a shoreline measured at 300 miles (480 km) in total, and is approximately 800 feet (240 m) above sea level.
The Foothills Trail is a 76-mile (122 km) National Recreation Trail in South and North Carolina, United States, for recreational hiking and backpacking. It extends from Table Rock State Park to Oconee State Park. It passes through the Andrew Pickens Ranger District of the Sumter National Forest, Ellicott Rock Wilderness, Whitewater Falls, and Lake Jocassee.
The Oconee Nuclear Station is a nuclear power station located on Lake Keowee near Seneca, South Carolina, and has an energy output capacity of over 2,500 megawatts. It is the second nuclear power station in the United States to have its operating license extended for an additional twenty years by the Nuclear Regulatory Commission (NRC).
Hiwassee Dam is a hydroelectric dam on the Hiwassee River in Cherokee County, in the U.S. state of North Carolina. It is one of three dams on the river owned and operated by the Tennessee Valley Authority, which built the dam in the late 1930s to bring flood control and electricity to the region. The dam impounds the Hiwassee Lake of 6,000 acres (2,400 ha), and its tailwaters are part of Apalachia Lake. At 307 feet (94 m), Hiwassee Dam is the third highest dam in the TVA system, behind only Fontana and Watauga. The dam and associated infrastructure was listed on the National Register of Historic Places in 2017.
Caliraya Dam is an embankment dam located in the town of Lumban province of Laguna, in the Sierra Madre Mountain Range of the Philippines. The reservoir created by the dam, Lake Caliraya, initially supplied one of the oldest hydroelectric plants in the Philippines, and later became a popular recreational area for numerous water sports and fishing. The dam's construction was started in 1939 under the supervision of the architecture firm of Pedro Siochi and Company and a small hydroelectric plant was operated in 1942.
Richard B. Russell Dam is a concrete-gravity and embankment dam located on the Savannah River at the border of South Carolina and Georgia, creating Richard B. Russell Lake. The dam was built by the U.S. Army Corps of Engineers between 1974 and 1985 for the purposes of flood control, hydroelectricity, recreation, additional stream flow regulation, water supply, and fish and wildlife management. The concrete structure of the dam spans 1,904 feet (580 m) and rises 210 feet (64 m) above the riverbed, housing a hydro-power plant with an installed 600 megawatts (800,000 hp) capacity. The Richard B. Russell Dam is the final large dam completed by the U.S. Army Corps in the Savannah River Basin and lies 30 miles downstream from the Hartwell Dam (1962) and 37 miles (60 km) upstream from the J. Strom Thurmond Dam (1954).
The Bad Creek Hydroelectric Station is a pumped-storage hydroelectric power station located 8 miles (13 km) north of Salem in Oconee County, South Carolina. The 1,065 megawatts (1,428,000 hp) power plant is owned by Duke Energy and its last generator was commissioned in 1991. The power station generates electricity by shifting water between an upper and lower reservoir. The upper Bad Creek Reservoir was created by damming Bad Creek and West Bad Creek while Lake Jocassee serves as the lower reservoir. During periods of low energy demand, the four 266 megawatts (357,000 hp) Francis pump turbines pump water from Lake Jocassee which lies at an elevation of 1,110 feet (340 m) to the Bad Creek Reservoir at an elevation of 2,310 ft (704 m) through a 1 mile (1.6 km) tunnel. When energy demand is high, water is released back from Bad Creek Reservoir back down to the pump turbines which then operate as generators. After electricity is produced, the water is returned to Lake Jocassee. The process is repeated as needed, primarily with the facility serving as a peaking power plant.
The Linth–Limmern Power Stations are a system of hydroelectric power stations located south of Linthal in the canton of Glarus, Switzerland. The system uses five reservoirs and four power stations at steep variations in altitude.
Abiquiu Dam is a dam on the Rio Chama, located about 60 miles (97 km) northwest of Santa Fe in Rio Arriba County, New Mexico. Built and operated by the U.S. Army Corps of Engineers (USACE), the dam is an earth embankment structure 354 feet (108 m) high and 1,800 feet (550 m) long, containing 11.8 million cubic yards of fill. The dam forms Abiquiu Lake, one of the largest lakes in New Mexico with a full storage capacity of 1,369,000 acre-feet (1,689,000 dam3) and 5,200 acres (2,100 ha) of water. To date, the reservoir has never filled to capacity, with a record high of 402,258 acre-feet (496,178 dam3), 29.4% of full pool, on June 22, 1987. The dam's primary purpose is flood control, in addition to irrigation and municipal water storage, and hydroelectric generation.
