In a finely balanced oil market, Nigeria has suddenly reemerged as a key player.

During the past few weeks, actions by the country’s massive Dangote refinery have moved prices, with purchases of US barrels initially boosting the crude futures curve before a decision to sell them sent oil tumbling.

Once fully operational, the plant outside Lagos will be able to process 650,000 barrels a day, rivaling the largest sites in the US and more than 50% larger than Europe’s biggest refinery.

A look at International Energy Agency data this week shows why that’s so important.

If OPEC+ adds supplies to the market next year as planned, there will be a surplus of about 860,000 barrels a day. The group currently plans to add 540,000 barrels a day next quarter.

Both figures are close to Dangote-sized swings.

Refinery ramp-ups are complicated, and there’s already been at least one delay. But once the site starts churning out gasoline, it will transform fuel markets in the region and upend long-established trade flows, particularly in Europe, where Nigeria currently purchases much of its supplies.

Aliko Dangote, the billionaire behind the plant, said last month the plan is for it to start producing the fuel in August, though others are doubtful.

“The refinery’s gasoline is unlikely to hit the market until at least September,” consultant FGE wrote this month, citing issues with some of the plant’s units.

Then there’s the question of feedstock.

The facility was built on a dream of Nigeria consuming its own crude. That’s why there was an uproar when Dangote started buying US supplies.

Recently, the country announced plans for its refiners to pay for oil in local currency and to consume as many as 445,000 barrels a day of domestic product. Still, it’s unclear how the latter will happen.

But if it does, that will mean less crude for current buyers, notably in Europe.

It also means that in an oil market focused on war, economic slowdowns and output curbs, Nigeria will be a surprisingly hot topic among traders in coming months.