Presentation on “Gilgel Gibe III Dam”

By Prashant saykar

Sagar maske

Under The Guidance Of

Mr.Prof .Ghodke Sir

Fast Facts: Gibe III DamLocation 300 km (190 miles) southwest of Addis Ababa, on the Omo RiverCost €1.55 billion (at current exchange rate, about US$2.11 billion). Project costs have increased 11% since 2008.Dam DesignRoller Compacted Concrete (RCC) gravity dam243 meters (787 feet) tall – the tallest dam in AfricaReservoirStorage capacity: 11.75 billion m3 (415 billion ft3)Surface: 211 km2 (84 miles2) Length: 151 km (94 miles)

Transmission Line A 65-km-long (40 mile) 400 KV transmission line; a new substation will be built.Electricity1,870 MW (6,500 GWh/yr), more than doubling the country’s current installed capacity.Original Timeline 2008: Construction began 2011: First power end2015: will be fully completed

GILJEL GIBE III DAM

Country:- EthiopiaLocation:-300 km southwest of Addis

AbabaPurpose: PowerConstruction began:-2008Opening date:- end 2015 Construction cost:- US$ 2.11 billionOwner:-Ethiopian Electric Power

Corporation(EEPCo)

Major component of projectDAMType of dam:-Gravity, Roller compacted concreteImpounds:- Omo riverHeight:-243 m (787 ft.)896m a,s.l of crest elevation.Length:- 610 m (2000 ft.)RESERVOIRHas the potential to reserve 11.75 billion m3 of water.Catchment area of 34,150Km2. A total surface area of 211 Km2 at normal operating

level.

SPILLWAYSpillway type:- Service An outlet from a reservoir to release surplus flood

water. An over flow Gated spillway divided in to seven

bays controlled by hydraulically operated radial gates and designed to discharge 10,600m3/s of flood.

POWER HOUSEPowerhouse situated on the left abutment, housing

ten Francis Turbines with a capacity of 187MW each for a total installed power of 1,870MW.

15 single phase step-up transformers of 147 MVA converting 15kV to 400kV.

Firm energy production 6500GWh/ year.

Dam Information The Gilgel Gibe III Dam is an under construction

243 m high roller-compacted concrete dam with associated hydropower plant on the Omo river in Ethiopia.

Once completed it would be the third largest hydroelectric plant in Africa with power output about 1870 megawatt.

Gibe III is part of the gibe cascade ,a series of Dam including the existing Gibe I dam (184 MW) & Gibe II power station (420MW)

General Layout of the Site Installations

Design of dam

design of Gilgel Gibe III Dam

The initial Design of dam foresaw a rock fill changed in to roller-compacted concrete dam.

Power station are conventional type. Turbines used for power generation is 10 x 187 MW Francis type turbine.

The direct benefits of this project will be 1,870 MW of electrical power and 6,500 Gwh of firm energy per year.

Normal operating level of the reservoir will be 892 m (2927 ft.) above sea level with max. 893 m (2930 ft.) & min 800 m (2600 ft.)

The dam spillway will be 108 m (354 ft.) long having maximum discharge capacity 10,600 m3/s.

Dam power house will be two penstock that each branch five separate tunnels for each individual turbine.

As January 2015 ,according to Ethiopia electric power project was 88% complete first two generator to be operational in June 2015 & remaining generator would be operational end of 2015.

Purpose of this dam projectThe main purpose of the dam will be electricity

generation.Expected to supply about half of its power to

Ethiopia & export other half to Kenya, Sudan countries.

A secondary purpose of this project will be flood protection.

Dam also use for irrigation purpose.

RESOURCESOfficial DocumentsEEPCo. 2009. Gibe III Environmental and Social Impact

Assessment. Available at: http://www.eepco.gov.et/Independent ReportsAfrica Resources Working Group. 2009. A Commentary on

the Environmental, Socioeconomic and Human Rights Impacts of the Proposed Gibe III Dam in the Lower Omo River Basin of Ethiopia. Available at: www.arwg-gibe.org

Campagna per la Riforma della Banca Mondiale. 2008. The Gilgel Gibe Affair. Available at: http://www.crbm.org/modules.php?name=browse&grpid=60

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