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Home Hydro Power

Chaglla Hydroelectric Power Plant

in Hydro Power, Projects, Renewable Power

The 462MW Chaglla hydroelectric power plant, being developed by Odebrecht Energia’s subsidiary Empresa de Generación Huallaga (EGH), will be Peru’s third biggest hydropower project.

Construction of the project began in May 2011 and operations are expected to commence in 2016. The plant is expected to generate 2,500 direct jobs and have an operational life of 30 years. It is estimated it will require an investment of $1.2bn and produce approximately 2.8 Gigawatts/hour a year, while offsetting approximately 467,000t of carbon dioxide emissions from the atmosphere.

Chaglla power plant design and development

 

The Chaglla hydroelectric project is located on the Huallaga River in the Chaglla district of Huanuco, Peru. It will include a concrete-face rock-filled dam, which will impound a 4.66km² reservoir upstream of the dam, diversion tunnel and hydroelectric generation facilities, comprising a powerhouse, substation and transmission line.

“Construction of the project began in May 2011 and operations are expected to commence in 2016.”

The rock-filled dam will have a maximum height of 202m and a crest length of approximately 273m, while the crest of the dam will be located at an elevation of 1,202m above sea level and 11.2m wide.

The reservoir will have an elevation of 1,196m and water surface area of 4.5km². It will have a storage capacity of approximately 375 million cubic meters (m³), and three tunnels with a total length of 2,850m were proposed on the left margin for spillway discharge.

In addition, the plant will feature two turbine generators with a nominal output of 253MVA and frequency of 60Hz. These turbines will have a nominal voltage of 13.8kV and will operate at a synchronous speed of 900rpm.

Water from the dam will be diverted through a 14.7km intake tunnel to the main powerhouse, which will be equipped with two Alstom power transformers with a nominal output of 225MW. The project will also feature a small power house, including a power transformer with an output of 6MW.

The substation will be situated above the main powerhouse at an elevation between 900m to 925m.

Power transmission from the Chaglla power plant

 

The power generated by the plant will be transferred to the Peruvian national grid (Sistema Electrico Interconectado Nacional-SEIN) at the Paragsha substation, via a 137km-long, 220kV transmission line.

Construction of the hydropower project

 

Four sites were created for the construction phase. Major works include the construction of the concrete-face dam with a 466ha reservoir, a surface powerhouse and a 1,053m long diversion, spillway and headrace tunnel. For the foundation and dam construction, an upstream and downstream cofferdam will be constructed at 1,068m and 1,009m respectively.
“The power generated by the plant will be transferred to the Peruvian national grid.”

Construction works also include the river bypass through trunk tunnelling, which has a diameter of 12.5m and length of 1,125m. The upstream cofferdam will measure 66m, while the downstream will be 14m high.

Financing

 

Inter-American Development Bank (IDB) provided a $150m loan facility to Odebrecht Energia for the hydroelectric power plant.

The project was also co-financed by Banco Nacional de Desenvolvimento Econômico e Social (BNDES), COFIDE (Development Finance Corporation), and other international commercial banks, while BNP Paribas acted as the financial advisor.

Contractors involved

 

Alstom was awarded a contract to supply all the hydro and electromechanical equipment, spare parts and services. The scope of supply includes two generation units with total power of 450MW, power transformers and switchyard equipment, as well as the complete mini hydropower plant.

Mott MacDonald was engaged by The Bank of New York Mellon as the independent engineer to monitor the power plant construction. The contractual scope includes providing support for the lenders in the construction, operations and monitoring phases of the project.

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