A listing of the active diesel-run power generators shows that the longest power purchase agreement runs till 2035, leaving consumers with a longer wait before the expensive energy sources end.
The Energy ministry last year began shedding the diesel-run power generation units by letting their contracts expire to reduce the burden on consumers.
Data from the Energy and Petroleum Regulatory Authority (Epra) show that there are eight thermal power plants with a combined installed capacity of 660.82 megawatts supplying the national grid.
Switching off thermal plants is part of the government's gradual phase-out plan of expensive diesel power generators as it moves to provide cheaper and cleaner energy.
Last year, Iberafrica’s 54MW thermal plant was dropped off the grid after 15 years with the expiry of its power purchase agreement.