Hydropower has been a cornerstone of grid-powered generation in Nigeria for decades. 15% of current power generation sources in the country are hydro based. The country is reasonably endowed with large rivers and some few natural falls. In all parts of Nigeria, potential sites for unexploited small hydropower exist, with an estimated total capacity of 3,500 MW. A multitude of river systems, providing a total of 70 micro dams, 126 mini dam and 86 small sites, supply a technically exploitable large hydropower potential estimated to be about 11,2500 MW. Under recent circumstances, only 17% is being tapped. Potential large investments in some significant hydropower sources and even some plans, such as the dam for the Mambilla plateau in northern Nigeria, have been struggling due to large investments cost required and lead times needed. The potential for small hydro power is about 3,500 MW, with just about 64.2 MW being exploited. By 2020, the Nigerian government aims to have increased the hydroelectricity generation capacity to 5,690 MW. This projection shall be met through an upgrade of old hydroelectricity plants and the installation of new hydro power plants.
Source: Federal Ministry of Power Nigeria