For Nigerians who have watched fuel prices swing violently since government subsidies were removed, a courtroom dispute in Lagos may decide whether relief or a new kind of vulnerability comes next.

Nigeria's state oil company, NNPC, has filed a defence in Federal High Court accusing Dangote Petroleum Refinery of trying to lock out import competition and position itself as the sole gatekeeper of the country's fuel market. The filing, seen by Reuters, argues that if a court voids or restricts import licences held by rival marketers, Nigeria could face supply disruptions, price instability, and a serious threat to national energy security.

How the fight started

Dangote Refinery filed the original lawsuit in April, challenging import licences that the Nigerian Midstream and Downstream Petroleum Regulatory Authority had issued or renewed for fuel marketers and NNPC itself. The refinery's argument is that those licences undercut domestic refining and violate Nigeria's Petroleum Industry Act, the sweeping 2021 law meant to restructure the country's energy sector.

NNPC's counter is blunt. The law, it says, explicitly allows import licences for companies with local refining capacity or strong international trading records. There is no mandatory ban on fuel imports unless domestic supply falls short, and regulators have the legal room to manage imports as they see fit under Nigeria's backward-integration policy. NNPC also challenged Dangote directly on capability, saying the refinery has not provided "credible, independent or verifiable evidence" that it can meet Nigeria's total fuel demand or guarantee uninterrupted supply nationwide.

Dangote declined to comment while the case is ongoing.

The regulatory authority has applied to join the lawsuit, widening what began as a dispute over licences into a broader fight over who gets to set the rules of Nigeria's downstream fuel market.

What is actually at stake

At the centre of this is a 650,000-barrel-per-day refinery, one of the largest on the planet, built by Africa's richest man in a country that spent decades importing nearly all of its refined fuel despite sitting on enormous crude oil reserves. Dangote's plant was supposed to change that, and in some respects it already has. But the gap between what the refinery can currently supply and what 200 million Nigerians consume every day means import competition is not just a business preference for rivals; it is a practical buffer against shortfall.

NNPC also denied a separate allegation that it had deliberately withheld crude oil from the refinery or sabotaged its operations, saying crude allocations depend on operational, commercial, security, and logistical factors.

The timing sharpens everything. Dangote has planned an IPO of the refinery business for September. Investors pricing that offering will want clarity on exactly the questions this lawsuit puts in dispute: whether the refinery gets protected domestic market share, how much import competition it will face, and what revenue it can realistically expect. A court ruling against Dangote's position would land directly on that calculus. So would a ruling in its favour, since investors would then also be buying into a company whose market dominance a regulator publicly called a monopoly risk.

Fuel marketers have lined up against Dangote's lawsuit too, warning it could damage both competition and supply security.

A hearing is scheduled for the coming weeks. Whatever the court decides, it will be drawing a line that determines whether Nigeria's fuel market is shaped by one very large domestic refiner or by a messier, more competitive mix of local production and imports. For ordinary Nigerians who have already absorbed some of the sharpest fuel-price increases in the country's recent history, the difference between those two futures is not abstract.