NHPC – Nachtigal Falls Hydroelectric Plant 420 MW – Littoral - Project Profile

Synopsis
"NHPC – Nachtigal Falls Hydroelectric Plant 420 MW – Littoral - Project Profile" contains information on the scope of the project including project overview and location. The profile also details project ownership and funding, gives a full project description, as well as information on contracts, tendering and key project contacts.

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Scope
The project involves the construction of a 420MW hydroelectric plant in Cameroon.

The US$1,398 million project includes the following:

1. Construction of a rolled concrete dam of a length of 1,400m at an average height of 11m

2. Construction of a 4.21m2 reservoir

3. Construction of a 3.3km canal to transport the water to the plant

4. Construction of a camp with office space

5. Construction of a headrace lined canal

6. Construction of a double busbar 225 kV generation substation

7. Construction of 6.5km of access road

8. Construction of a concrete plant to produce approximately 130,000m3 of concrete

9. Construction of a quarry for the extraction of approximately 170,000m3 of laterite

10. Construction of a 1ha temporary landfill for the sorting pretreatment and disposal of non-hazardous solid waste

11. Construction of a secondary 4.5 MW power plant

12. Installation of seven Francis turbines with a capacity of 60MW each

13. Installation of eight three-phase transformers of 73MVA capacity

14. Installation of seven alternators with a capacity of 73MVA

15. Laying of a 50.3km 225kV double circuit transmission line equipped with two bundle conductors
Summary
Natchigal Hydro Power Company (NHPC) a company formed Électricité de France (EDF), International Finance Corporation (IFC) and the Government of Cameroon (GC) are jointly planning to undertake the construction of Nachtigal Falls Hydroelectric Plant project in Cameroon.

The project involves the construction of a 420MW hydroelectric plant. It includes the construction of a rolled concrete dam of a length of 1,400m at an average height of 11m, a 4.21m2 reservoir, a 3.3km canal to transport the water to the plant, a camp with office space, a headrace lined canal and a double busbar 225 kV generation substation, 6.5km of access road, a concrete plant to produce approximately 130,000m3 of concrete, a quarry for the extraction of approximately 170,000m3 of laterite, a 1ha temporary landfill for the sorting pretreatment and disposal of non-hazardous solid waste generated by EPC contractors and NHPC offices and the installation of seven Francis turbines with a capacity of 60MW each, eight three-phase transformers of 73MVA capacity, seven alternators with a capacity of 73MVA and laying of a 50.3km 225kV double circuit transmission line equipped with two bundle conductors to transport the power produced from the power plant generation substation to the Nyom 2 connection substation.

A roller compacted concrete dam on the Sanaga River, comprises of an overflow section with a total length of 1,455m and a maximum height of 13.6m, and a non-overflow section with a length of 553m and a maximum height of 16m to create a 27.8 million m3 reservoir with a surface of 4.21km2 at normal operating level.

A headrace lined canal about 3.3km long and 14m deep on average to transfer water to the hydroelectric power plant with a maximum flow rate of 980m3/s corresponding to the design flow of the hydroelectric power plant equipment.

The project also includes the construction of a secondary 4.5MW power plant to generate electricity from the environmental flow (riparian release) to be discharged downstream of the dam.

The project will be implemented in two parts namely (1) the hydroelectric plant and its ancillary constructions and (2) the high voltage powerline.

The project will be funded 75% by the international banks and 25% by local banks which include the World Bank and other international financial partners and local banks namely BICEC, Ecobank and SCB-Cameroon Commercial Banking Corporation, a Cameroonian subsidiary of the Moroccan group Attijariwafa bank.

Artelia and Aecom have been appointed as an environmental consultant.

In November 2013, EDF, IFC, and GC entered into an agreement to develop the project. EDF will provide 40% of the funding, with IFC and GC contributing 34% and 26% respectively.

On November 8, 2013, a joint development agreement (JDA) was signed between a Group of Investors including the Government of Cameroon (GoC), EDF, the International Finance Corporation (IFC) and Rio Tinto Alcan (RTA) for the development of the project. However, Rio Tinto Alcan (RTA) withdrew from the project.

On July 10, 2014, EDF and IFC signed an agreement with the State of Cameroon for the project development.

On April 30, 2015, an expression of interest (EoI) was issued for several packages including LOT GC1, which includes the earthworks, dams Roller Compacted Concrete (RCC) 15m and 2,000m in total length, labyrinth spillways & winnowed and canal embankments and covered 3.3km pass a flow of 980 m3/s; LOT GC2, Civil engineering of the hydroelectric plant & taking power pool water: concrete conventional, penstocks and hydro-mechanical equipment usinières hydrants (Headgates, stop logs and bar screen).

LOT EM1, which includes the whole plant equipment under 50m fall (turbines, generators, transformers, control systems, cranes, equipment auxiliary), production station HTB; LOT EM2, which includes the evacuation lines between processors and the production station (0.8km) and the 225kV lines between the post-production and that Nyom 2 (50.3km).

In October 2015, the pre-qualified bidders were selected for all the packages including LOT GC1, LOT GC2, LOT EM1 and LOT EM2. The below is the list of pre-qualified bidders for the packages specified:

LOT GC1:


1. Consortium of Razel BEC/Sogea Satom/Vinci Construction Grands Projets


2. Consortium of NGE Contracting/ SGTM

LOT GC2:


1. Consortium of Besix/ Six International/ Tractebel Engineering


2. Consortium of Vinci Construction Grands Projets/ Razel BEC/ Sogea Satom


3. Consortium of NGE Contracting/ SGTM

LOT EM1:


1. Andritz Hydro GmbH/ Andritz Hydro GmbH


2. Toshiba Corporation/ Clemessy S.A


3. Alstom Hydro France


4. Voith Hydro GmbH & Co. KG/ Cegelec SAS

LOT EM2:


1. Cofely INEO GDF SUEZ


2. Bouygues Energies Services


3. Elecnor

In July 2016, Electricite de France (EDF) and the World Bank were joined with the government of Cameroon to fund US$1300 million for the project.

On July 7, 2016, NHPC a company formed by EDF with 40% stake, IFC with 30% stake, GC with 30% state.

On April 20, 2017, NHPC signed a concession agreement for the generation of electricity for a period of 35 years with the Ministry of Water and Energy.

On June 6, 2017, a letter of intent was signed between the State of Cameroon, Eneo SA, SONATREL and NHPC to formalize their agreement in principle of the terms of the Power Purchase Agreement, Connection Agreement to the electricity transmission network, Dispatch Agreement of electricity and Commitment Agreement establishing in particular the respective role of each party in the project.

On January 10, 2018, China National Machinery Industry Corporation (SINOMACH) appointed as a construction contractor for the project. The scope of the contract includes conducting preliminary, advanced studies as well as the detailed engineering phase and environmental and social impacts.
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