Answer
The Akosombo Dam refurbishment project, overseen by John Mahama, involved the rehabilitation and modernization of the Akosombo Dam, a major hydroelectric power plant in Ghana. The project aimed to extend the dam's lifespan, increase its power generation capacity, and improve its safety and reliability. The refurbishment included the replacement of turbines, generators, and other critical components, as well as upgrades to the dam's control systems and infrastructure.