When Aliko Dangote described building Africa’s largest oil refinery as the biggest business risk of his life this week, he was reflecting on a project that many believed would never move beyond an ambitious vision.

Speaking during a visit by Nigeria’s Minister of State for Industry, Trade and Investment, John Owan Enoh, to the Dangote Petroleum Refinery in Lagos, Africa’s richest man acknowledged the scale of the gamble behind the more than $20 billion investment.

The admission comes after one of the most challenging industrial projects ever undertaken on the continent transformed from a venture many financiers viewed with scepticism into a refinery that is reshaping fuel trade across Africa.

The Dangote refinery was never meant to be an ordinary energy project. Designed to process 650,000 barrels of crude oil per day, it is the world’s largest single-train refinery and one of the biggest privately financed industrial developments in Africa.

Beyond the refinery itself, the project required the construction of an entire industrial ecosystem, including a deep-sea port, power plant, pipelines, storage facilities and other critical infrastructure on reclaimed land outside Lagos.