Mainstream Energy Solutions Limited (MESL) was incorporated and licensed as a power generating company in 2011. The Kainji and Jebba Hydro Plants (HPP) with a total installed capacity of 1338.4 MW were acquired through a concession agreement with the Federal Government of Nigeria in November 2013. The two hydro plants are cascaded 100km apart with Kainji dam situated on the upstream of Jebba.
The two hydro power plants Kainji and Jebba have installed capacities of 760MW and 578.4MW, respectively. Kainji was commissioned as Nigeria’s first Hydro Power plant in 1968 while the Jebba Hydro Power plant was commissioned in 1985.
Jebba dam is located between Niger and Kwara State. The dam is earth and rockfill and is coupled with several auxiliary dams and infrastructure. The main dam is located to the south and its imperviousness is secured by an upstream blanket. It is followed by a lock and the auxiliary concrete dams 4, 3 and 2. Between these auxiliary dams there is a spillway and the powerhouse with water inlet. The emergency reinforced spillway and auxiliary dam 1 are composed of a dike of the same type as the main dam. A saddle dam, of the same type as the main dam, closes a secondary valley. The normal operating level is 103.0 metres.
Kainji dam is located in Borgu LGA of Niger State.The dam comprises the civil dam structure, the gated spillway, the hydroelectric turbine and generators, and a navigation lock, with monitoring and control systems to all these. The power house is equipped with eight turbine-alternator groups including four Kaplan type rated at 80 MW, two turbines also Kaplan type rated at 100 MW and two KAPLAN turbines rated at 120 MW.
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