The Ust-Ilimsk Hydroelectric Power Station (Ust-Ilimsk HPS) is a concrete gravity

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aqua ...

on the

Angara River The Angara (; ) or Angar ( мүрэн) is a major river in Siberia, which traces a course through Russia's Irkutsk Oblast and Krasnoyarsk Krai. It drains out of Lake Baikal and is the headwater tributary of the Yenisey. It is long, and has a ...

and adjacent

hydroelectric Hydroelectricity, or hydroelectric power, is Electricity generation, electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity, almost 4,210 TWh in 2023, which is more than all other Renewable energ ...

power station A power station, also referred to as a power plant and sometimes generating station or generating plant, is an industrial facility for the electricity generation, generation of electric power. Power stations are generally connected to an electr ...

. It is located near

Ust-Ilimsk Ust-Ilimsk ( rus, Усть-Илимск, p=usʲtʲ ɪˈlʲimsk) is a town in Irkutsk Oblast, Russia, located on the Angara River. Population: 53,000 (1977). History An '' ostrog'' (fortress) was built on the present site of the town in the ...

Irkutsk Oblast Irkutsk Oblast (; ) is a federal subjects of Russia, federal subject of Russia (an oblast), located in southeastern Siberia in the basins of the Angara River, Angara, Lena River, Lena, and Nizhnyaya Tunguska Rivers. The administrative center is ...

Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...

and is the third dam on the Angara cascades. Construction of the dam began in 1963, its reservoir began to fill in 1974, and the power plant was commissioned in 1980.

History

Background

Between 1951 and 1955, construction of the Ust-Ilimsk HPS was designated as a priority and in September 1960, the State Commission determined the most suitable spot for the dam. It would be constructed on the Angara River, below the mouth of the

Ilim River The Ilim () is a river in Irkutsk Oblast in Russia, a right tributary of the Angara. It flows north between and parallel to the rivers Angara and Lena, and then swings west to join the Angara south of Ust-Ilimsk. Geography The Ust-Ilimsk Dam o ...

. Gidroproekt All-Union Design and Exploratory Institute produced the design of the HPS and on June 8, 1962, the

Central Committee of the CPSU The Central Committee of the Communist Party of the Soviet Union was the Central committee, highest organ of the Communist Party of the Soviet Union (CPSU) between Congress of the Communist Party of the Soviet Union, Congresses. Elected by the ...

and Ministerial Council of the

USSR The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

determined the schedule of construction and the project's scope.

Construction

Construction on Stage I of the HPS began in 1963. This included preparing the dam's foundation, various construction facilities and 220 kV power lines. In addition, the village of

was created as well to support workers on the project. By 1966, the Bratsk-Ust-Ilimsk motorway was opened to traffic and in March of that year, construction began on the actual power plant. On April 22, 1968, the first concrete was poured into the dam's foundation and by October 3, 1974, the dam began to inundate the Angara River, creating its reservoir. The dam was accepted for industrial operation in 1980.

Generation

By 1981, the HPS had generated its first 100 billion kWh which had doubled by 1986 and doubled again by 1995 with 400 billion kWh. By October 1, 2005, it had produced 600 billion kWh of electricity. For comparison, in 2008, U.S. residential and commercial sectors consumed about 517 billion kWh for lighting. On average, the station produces 21.7 billion kWh annually and utilizes its installed capacity for 5,050 hours out of 8,760 a year.

Specifications

The main dam is long and high with a

spillway A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure tha ...

of in length. It is flanked by two earth-fill auxiliary dams, the one on its left (west) bank that is long and high. On the right (east) bank, the auxiliary dam is long and high. The power station is located on the right (east) bank and is long and houses 16 turbines with an installed capacity of 3,840 MW. The power station is designed to support another two turbines which, if installed, would bring its capacity up to 4,320 MW.

References