Itaipu
Encyclopedia
The Itaipu Dam is a hydroelectric dam on the Paraná River
Paraná River
The Paraná River is a river in south Central South America, running through Brazil, Paraguay and Argentina for some . It is second in length only to the Amazon River among South American rivers. The name Paraná is an abbreviation of the phrase "para rehe onáva", which comes from the Tupi language...

 located on the border between Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

 and Paraguay
Paraguay
Paraguay , officially the Republic of Paraguay , is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to the east and northeast, and Bolivia to the northwest. Paraguay lies on both banks of the Paraguay River, which runs through the center of the...

. The name "Itaipu" was taken from an isle that existed near the construction site. In the Guarani language, means "the sound of a stone". The American composer Philip Glass
Philip Glass
Philip Glass is an American composer. He is considered to be one of the most influential composers of the late 20th century and is widely acknowledged as a composer who has brought art music to the public .His music is often described as minimalist, along with...

 has also written a symphonic cantata
Cantata
A cantata is a vocal composition with an instrumental accompaniment, typically in several movements, often involving a choir....

 named Itaipu
Itaipu (composition)
Itaipu is a four movement symphonic cantata by Philip Glass. The composition was written in 1989, and pays homage to the world's largest hydroelectric dam, built on the Paraná River between Paraguay and Brazil. The text is written in Guaraní, with a translation by Daniela Thomas...

, in honour of the structure.

The dam is the largest operating hydroelectric facility in terms of annual generating capacity, generating 94.7 TWh in 2008 and 91.6 TWh in 2009, while the annual generating capacity of the Three Gorges Dam
Three Gorges Dam
The Three Gorges Dam is a hydroelectric dam that spans the Yangtze River by the town of Sandouping, located in the Yiling District of Yichang, in Hubei province, China...

 was 80.8 TWh in 2008 and 79.4 TWh in 2009. The dam's 14,000 MW installed capacity is second to the Three Gorges Dam's 22,500 MW though. It is a binational undertaking run by Brazil and Paraguay at the Paraná River on the border section between the two countries, 15 km (9.3 mi) north of the Friendship Bridge
Friendship Bridge (Paraguay–Brazil)
The Friendship Bridge is an arch bridge connecting the Brazilian city of Foz do Iguaçu and the Paraguayan city of Ciudad del Este.-History and importance:...

. The project ranges from Foz do Iguaçu
Foz do Iguaçu
Foz do Iguaçu is the 7th largest city in Paraná state, Brazil, with a population of 255,900 inhabitants. It is located approximately 650 km west of Curitiba, Parana's capital city, being the westernmost city in that state...

, in Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

, and Ciudad del Este
Ciudad del Este
Ciudad del Este is the second largest city in Paraguay and capital of Alto Paraná department, located at the Rio Paraná....

 in Paraguay, in the south to Guaíra and Salto del Guairá in the north. The installed generation capacity of the plant is 14 GW, with 20 generating units providing 700 MW each with a hydraulic design head of 118 m. In 2008 the plant generated a record 94.68 billion kWh, supplying 90% of the electricity consumed by Paraguay and 19% of that consumed by Brazil.

Of the twenty generator units currently installed, ten generate at 50 Hz
Hertz
The hertz is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. One of its most common uses is the description of the sine wave, particularly those used in radio and audio applications....

 for Paraguay and ten generate at 60 Hz for Brazil. Two 600 kV HVDC
HVDC Itaipu
The HVDC Itaipu is a High Voltage Direct Current transmission line in Brazil from the Itaipu hydroelectric power plant to the region of São Paulo. The project has two bipolar lines, which run from the generator site at Foz do Iguaçu in Paraná to the "load" site Ibiúna near São Roque, São Paulo...

 lines, each approximately long, carry both Brazilian and Paraguayan energy to São Paulo where the terminal equipment converts the power to 60 Hz.

Negotiations between Brazil and Paraguay

The concept behind Itaipu Power Plant was the result of heavy negotiations between the two countries during the 1960s. The "Ata do Iguaçu" (Iguaçu Act) was signed on July 22, 1966, by the Brazilian and Paraguayan Ministers of Foreign Affairs, Juracy Magalhães and Sapena Pastor, respectively. This was a joint declaration of the mutual interest in studying the exploitation of the hydric resources that the two countries shared in the section of the Paraná River starting from, and including, the Salto de Sete Quedas, to the Iguaçu River's watershed. The Treaty that gave origin to the power plant was signed in 1973.

The terms of the treaty, which expires in 2023, have been the subject of widespread discontent in Paraguay. The government of President Lugo vowed to renegotiate the terms of the treaty with Brazil, which long remained hostile to any renegotiation.

In 2009, Brazil agreed to a fairer payment of electricity to Paraguay and also allowed Paraguay to sell excess power directly to Brazilian companies instead of solely through the Brazilian electricity monopoly.

Construction starts

In 1970, the consortium
Consortium
A consortium is an association of two or more individuals, companies, organizations or governments with the objective of participating in a common activity or pooling their resources for achieving a common goal....

 formed by the companies IECO (from the United States of America) and ELC Electroconsult S.p.A.
ELC Electroconsult S.p.A.
ELC Electroconsult is a historic Italian engineering firm established in 1955 by the major Italian private companies leading and pioneering since 1905 in planning, design and construction of hydropower schemes in the Alps....

 (from Italy
Italy
Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

) won the international competition for the realization of the viability studies and for the elaboration of the construction project. Work began in February 1971. On April 26, 1973, Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

 and Paraguay
Paraguay
Paraguay , officially the Republic of Paraguay , is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to the east and northeast, and Bolivia to the northwest. Paraguay lies on both banks of the Paraguay River, which runs through the center of the...

 signed the Itaipu Treaty, the legal instrument for the hydroelectric exploitation of the Paraná River by the two countries. On May 17, 1974, the Itaipu Binacional entity was created to administer the plant's construction. The works began in January of the following year.

Paraná River rerouted

On October 14, 1978, the Paraná River had its route changed, which allowed a section of the riverbed to dry so the dam could be built there.

Agreement by Brazil, Paraguay, and Argentina

An important diplomatic settlement was reached with the signing of the Acordo Tripartite by Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

, Paraguay
Paraguay
Paraguay , officially the Republic of Paraguay , is a landlocked country in South America. It is bordered by Argentina to the south and southwest, Brazil to the east and northeast, and Bolivia to the northwest. Paraguay lies on both banks of the Paraguay River, which runs through the center of the...

 and Argentina
Argentina
Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

, on October 19, 1979. This agreement established the allowed river levels and how much they could change as a result of the various hydroelectrical undertakings in the watershed that was shared by the three countries. At that time, the three countries were ruled by military dictatorships. Argentina was concerned that, in the event of a conflict, Brazil could open the floodgates, raising the water level in the River Plate
Río de la Plata
The Río de la Plata —sometimes rendered River Plate in British English and the Commonwealth, and occasionally rendered [La] Plata River in other English-speaking countries—is the river and estuary formed by the confluence of the Uruguay River and the Paraná River on the border between Argentina and...

 and consequently flood the capital city of Buenos Aires
Buenos Aires
Buenos Aires is the capital and largest city of Argentina, and the second-largest metropolitan area in South America, after São Paulo. It is located on the western shore of the estuary of the Río de la Plata, on the southeastern coast of the South American continent...

.

Formation of the lake

The plant's reservoir
Reservoir
A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 began its formation on October 13, 1982, when the dam works were completed and the side canal's gates were closed. Throughout this period, heavy rains and flooding accelerated the filling of the reservoir as the water rose 100 meters (330 ft) and reached the gates of the spillway
Spillway
A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically being the river that was dammed. In the UK they may be known as overflow channels. Spillways release floods so that the water does not overtop and damage or even destroy...

 at 10 a.m. on October 27.

Start of operations

On May 5, 1984, the first generation unit started running in Itaipu. The first 18 units were installed at the rate of two to three a year; the last two of these started running in the year 1991.

Capacity expansion in 2007

The last two of the 20 electric generation units started operations in September 2006 and in March 2007, thus raising the installed capacity to 14 GW and completing the power plant. This increase in capacity will allow for 18 generation units to remain running all of the time while two stay down for maintenance. Due to a clause in the treaty signed between Brazil, Paraguay and Argentina, the maximum number of generating units allowed to operate simultaneously cannot exceed 18 (see the agreement section for more information).

The rated nominal power of each generating unit (turbine and generator) is 700 MW. However, because the head
Hydraulic head
Hydraulic head or piezometric head is a specific measurement of water pressure above a geodetic datum. It is usually measured as a water surface elevation, expressed in units of length, at the entrance of a piezometer...

 (difference between reservoir level and the river level at the foot of the dam) that actually occurs is higher than the designed head (118 m), the power available exceeds 750 MW half of the time for each generator.

Each turbine generates around 700 MW; by comparison, all the water from the Iguaçu Falls would have the capacity to feed only two generators.

November 2009 power failure

On November 10, 2009, transmission from the plant was totally disrupted, possibly due to a storm damaging up to three high-voltage distribution lines. Itaipu itself was not damaged. This caused massive power outages in Brazil and Paraguay, blacking out the entire country of Paraguay for 15 minutes, and plunging Rio de Janeiro and São Paulo into darkness for more than 2 hours. 50 million people were reportedly affected. The blackout hit at 10:13 p.m. local time. It affected the southeast of Brazil most severely, leaving São Paulo, Rio de Janeiro and Espírito Santo completely without electricity. Blackouts also swept through the interior of Rio Grande do Sul, Santa Catarina, Mato Grosso do Sul, Mato Grosso, the interior of Bahia and parts of Pernambuco, energy officials said. By 12:30 a.m. power had been restored to most areas.

Wonder of the Modern World

In 1994, the American Society of Civil Engineers
American Society of Civil Engineers
The American Society of Civil Engineers is a professional body founded in 1852 to represent members of the civil engineering profession worldwide. It is the oldest national engineering society in the United States. ASCE's vision is to have engineers positioned as global leaders who strive toward...

 elected the Itaipu Dam as one of the seven modern Wonders of the World
Wonders of the World
Various lists of the Wonders of the World have been compiled from antiquity to the present day, to catalogue the world's most spectacular natural wonders and manmade structures....

. In 1995, the American magazine Popular Mechanics
Popular Mechanics
Popular Mechanics is an American magazine first published January 11, 1902 by H. H. Windsor, and has been owned since 1958 by the Hearst Corporation...

published the results.

Social and environmental impacts

When construction of the dam began, approximately 10,000 families living beside the Paraná River were displaced.

The world's largest waterfall by volume, the Guaíra Falls
Guaíra Falls
Guaíra Falls were a series of immense waterfalls on the Paraná River along the border between Brazil and Paraguay. The falls no longer exist, inundated in 1982 by the impoundment of the Itaipu Dam reservoir...

 were drowned by the newly formed Itaipu reservoir. The Brazilian government liquidated the Guaíra Falls National Park, and dynamited the submerged rock face where the falls had been, facilitating safer navigation, but eliminating the possibility of restoring the falls in the future. A few months before the reservoir was filled, 80 people died when an overcrowded bridge overlooking the falls collapsed, as tourists sought a last glimpse of the falls.

Statistics

Construction

  • The course of the seventh biggest river in the world was shifted, as were 50 million tons of earth and rock.
  • The amount of concrete
    Concrete
    Concrete is a composite construction material, composed of cement and other cementitious materials such as fly ash and slag cement, aggregate , water and chemical admixtures.The word concrete comes from the Latin word...

     used to build the Itaipu Power Plant would be enough to build 210 football
    Football (soccer)
    Association football, more commonly known as football or soccer, is a sport played between two teams of eleven players with a spherical ball...

     stadiums the size of the Estádio do Maracanã
    Estádio do Maracanã
    The Estádio do Maracanã , officially Estádio Jornalista Mário Filho, is an open-air stadium in Rio de Janeiro, Brazil. Owned by the Rio de Janeiro State Government, it is named after the Maracanã neighbourhood in Rio de Janeiro. It was opened in 1950 to host the FIFA World Cup, and in the final...

    .
  • The iron
    Iron
    Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...

     and steel
    Steel
    Steel is an alloy that consists mostly of iron and has a carbon content between 0.2% and 2.1% by weight, depending on the grade. Carbon is the most common alloying material for iron, but various other alloying elements are used, such as manganese, chromium, vanadium, and tungsten...

     used would allow for the construction of 380 Eiffel Tower
    Eiffel Tower
    The Eiffel Tower is a puddle iron lattice tower located on the Champ de Mars in Paris. Built in 1889, it has become both a global icon of France and one of the most recognizable structures in the world...

    s.
  • The volume of excavation of earth and rock in Itaipu is 8.5 times greater than that of the Channel Tunnel
    Channel Tunnel
    The Channel Tunnel is a undersea rail tunnel linking Folkestone, Kent in the United Kingdom with Coquelles, Pas-de-Calais near Calais in northern France beneath the English Channel at the Strait of Dover. At its lowest point, it is deep...

     and the volume of concrete is 15 times greater.
  • Around forty thousand people worked in the construction.
  • The cost of constructing Itaipu makes it one of the most expensive objects ever built.

Generating station and dam

  • The total length of the dam is 7235 m. The crest elevation is 225 m. Itaipu is actually four dams joined together — from the far left, an earth fill dam, a rock fill dam, a concrete buttress main dam
    Buttress dam
    A buttress dam or hollow dam is a dam with a solid, water-tight upstream side that is supported at intervals on the downstream side by a series of buttresses or supports. The dam wall may be flat or curved. Most buttress dams are made of reinforced concrete and are heavy, pushing the dam into the...

    , and a concrete wing dam to the right.
  • The spillway has a length of 483 m.
  • The maximum flow of Itaipu's fourteen segmented spillway
    Spillway
    A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically being the river that was dammed. In the UK they may be known as overflow channels. Spillways release floods so that the water does not overtop and damage or even destroy...

    s is 62.2 thousand cubic metres per second
    Second
    The second is a unit of measurement of time, and is the International System of Units base unit of time. It may be measured using a clock....

    , into three skislope formed canals. It is equivalent to 40 times the average flow of the nearby natural Iguaçu Falls.
  • The flow of two generators (700 m3·s−1 each) is roughly equivalent to the average flow of the Iguaçu Falls (1500 m3·s−1).
  • If Brazil were to use Thermal Power Generation
    Thermal power station
    A thermal power station is a power plant in which the prime mover is steam driven. Water is heated, turns into steam and spins a steam turbine which drives an electrical generator. After it passes through the turbine, the steam is condensed in a condenser and recycled to where it was heated; this...

     to produce the electric power
    Electric power
    Electric power is the rate at which electric energy is transferred by an electric circuit. The SI unit of power is the watt.-Circuits:Electric power, like mechanical power, is represented by the letter P in electrical equations...

     of Itaipu, 434000 barrels (69,000.5 m³) of petroleum
    Petroleum
    Petroleum or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights and other liquid organic compounds, that are found in geologic formations beneath the Earth's surface. Petroleum is recovered mostly through oil drilling...

     would have to be burned every day.
  • The dam is 196 metres high, equivalent to a 65-story building.
  • Though it is the seventh largest reservoir in size in Brazil, the Itaipu's reservoir
    Reservoir
    A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

     has the best relation between electricity production and flooded area. For the 14,000 MW installed power, 1350 square kilometres were flooded. The reservoirs for the hydroelectric power plants of Sobradinho Dam
    Sobradinho Dam
    The Sobradinho Dam is a large hydroelectric dam built on the São Francisco River in Sobradinho, in the state of Bahia of Brazil. Completed in 1982, the dam generates power by utilizing six turbines of each, totalling the installed capacity to .- See also :...

    , Tucuruí Dam
    Tucurui dam
    The Tucuruí Dam is a concrete gravity dam on the Tocantins River located on the Tucuruí County in the State of Pará, Brazil. The main purpose of the dam is hydroelectric power production and navigation. It is the first large-scale hydroelectric project in the Brazilian Amazon rainforest. The...

    , Porto Primavera Dam, Balbina Dam
    Balbina Dam
    The Balbina Dam is a hydroelectric dam and power station on the Uatumã River in the Amazon Rainforest, Brazil. The location is under the municipality of Presidente Figueiredo jurisdiction, in the state of Amazonas....

    , Serra da Mesa Dam
    Serra da Mesa Dam
    The Serra da Mesa Dam, once known as Sao Felix, is an embankment dam on the Tocantins River near Minaçu in Goiás, Brazil. The dam serves an associated hydroelectric power plant with a 1,275 MW installed capacity...

     and Furnas Dam are all larger than the one for Itaipu, but have a smaller installed generating capacity. The one with the largest hydroelectric production, Tucuruí, has an installed capacity of 8,000 MW, while flooding 2430 km² (938 sq mi) of land.

Generation

Annual production of energy
Year Installed units
1984 0–2 277
1985 2–3 6,327
1986 3–6 21,853
1987 6–9 35,807
1988 9–12 38,508
1989 12–15 47,230
1990 15–16 53,090
1991 16–18 57,517
1992 18 52,268
1993 18 59,997
1994 18 69,394
1995 18 77,212
1996 18 81,654
1997 18 89,237
1998 18 87,845
1999 18 90,001
2000 18 93,428
2001 18 79,307
2002 18 82,914
2003 18 89,151
2004 18 89,911
2005 18 87,971
2006 19 92,690
2007 20 90,620
2008 20 94,684
2009 20 91,652
2010 20 85,970
Total 20 1,846,517


See also

  • Eng Souza Dias (Jupiá) Dam
    Eng Souza Dias Dam
    The Engineer Souza Dias Dam, formerly known as the Jupiá Dam is an embankment dam on the Paraná River near Três Lagoas in São Paulo, Brazil. It was constructed for hydroelectric power production, flood control and navigation. Studies on the dam and power plant began in 1951 which recommended the...

  • Eng Sérgio Motta (Porto Primavera) Dam
    Eng Sérgio Motta Dam
    The Engineer Sérgio Motta Dam, formerly known as the Porto Primavera Dam, is an embankment dam on the Paraná River near Rosana in São Paulo, Brazil. It was constructed between 1980 and 1999 for hydroelectric power production, flood control and navigation. The dam is named for Sergio Roberto Vieira...

  • Ilha Solteira Dam
    Ilha Solteira Dam
    The Ilha Solteira Dam is an embankment dam on the Paraná River near Ilha Solteira in São Paulo, Brazil. It was constructed between 1967 and 1973 for hydroelectric power production, flood control and navigation....

  • List of largest hydroelectric power stations
  • List of largest power stations in the world
  • List of conventional hydroelectric power stations
  • List of dam megaprojects
  • List of power stations in Brazil
  • Megaproject
    Megaproject
    A megaproject is an extremely large-scale investment project. Megaprojects are typically defined as costing more than US$1 billion and attracting a lot of public attention because of substantial impacts on communities, environment, and budgets. Megaprojects can also be defined as "initiatives that...

  • Three Gorges Dam
    Three Gorges Dam
    The Three Gorges Dam is a hydroelectric dam that spans the Yangtze River by the town of Sandouping, located in the Yiling District of Yichang, in Hubei province, China...

  • List of hydroelectric power station failures

External links

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