President Samia Suluhu Hassan inaugurated the Julius Nyerere Hydropower Project on 22 August, a 2,115-megawatt facility on the Rufiji River in Coast Region that lifts Tanzania’s installed generation capacity to 4,646 megawatts against peak demand of roughly 2,270 megawatts, a surplus of about 2,375 megawatts. Nine generating units of 235 megawatts each make up the plant, and it was already operating ahead of its formal ceremony: by 31 May 2026 it had supplied 44.9% of all electricity fed into the national grid over the preceding year.
The financing detail sets this apart from most large African power projects. Tanzania paid for the plant itself, at a cost of roughly Sh7.45 trillion, about $2.8 billion, financed domestically rather than through the concessional loans or foreign sovereign financing that typically underwrite projects of this scale in the region. Construction ran from June 2019 to March 2025, with Egyptian firms Arab Contractors and Elsewedy Electric handling civil works and China’s Dongfang Electric supplying the turbines and electromechanical equipment. The build employed around 12,000 to 14,000 workers, with Tanzanians accounting for 99% of the workforce, alongside professional skills training in welding, steel fixing and heavy machinery operation delivered by Chinese engineers.
Tanzania is already converting the surplus into regional positioning. The government has signed an agreement to export power to Zambia and reached a trading arrangement with Kenya, alongside a newly completed 400kV Chalinze-Dodoma transmission line that added 150 megawatts of usable capacity within three days of coming online. Tanzania belongs to both the Eastern Africa Power Pool and, through TANESCO, the Southern African Power Pool, though it has historically lacked a physical transmission link to the latter, a gap this project’s surplus gives it new reason to close.
One vulnerability sits underneath the surplus headline and deserves equal weight. The Rufiji is a seasonal river. A plant now supplying close to half of Tanzania’s national grid, and the basis for new export commitments to Zambia and Kenya, ties both domestic energy security and cross-border trade reliability to rainfall patterns in a single river basin. The inauguration also carried a diplomatic subtext unrelated to Tanzania directly: Egyptian Prime Minister Mostafa Madbouly attended and used the occasion to say the project “refutes claims that Egypt opposes development in Nile Basin countries,” a statement that lands one day after Ethiopia said it would build further dams “whenever it deemed necessary” and Egypt’s foreign minister said Cairo would not allow more dams on the Nile. The Rufiji is not a Nile tributary, but Egypt’s choice to make that argument at a Tanzanian hydropower ceremony signals how central Nile-basin diplomacy has become to Cairo’s regional messaging generally.
What to watch: how the export agreements with Zambia and Kenya perform during Tanzania’s dry season, which is the real test of whether this surplus is durable or seasonal; whether the new SAPP transmission link materializes, which would be the more significant regional integration story than the plant itself; and whether Tanzania diversifies its generation mix further, since hydropower’s exposure to rainfall variability is the same structural risk regardless of how large any single plant’s capacity is.