São Tomé rejects bids from Brazil’s Petrobras and Nigeria’s Oranto after generous offshore oil auction fails to attract enough competition

An African island nation offered oil companies control of as much as 85% of three offshore blocks. Only two investors came forward.

São Tomé rejects bids from Brazil’s Petrobras and Nigeria’s Oranto after generous offshore oil auction fails to attract enough competition

• São Tomé and Príncipe have reportedly rejected bids for three offshore oil blocks after its licensing round attracted only Petrobras and Oranto Petroleum.
• The decision came despite the Central African island nation offering investors participating interests of up to 85%.
• Its first two offshore exploration wells confirmed an active petroleum system but failed to establish commercially viable oil deposits.
• The result exposes the difficulty facing Africa’s smaller frontier markets as energy companies concentrate capital on proven discoveries and projects with faster returns.

São Tomé and Príncipe has now reportedly rejected every bid submitted in its latest licensing round, delivering another setback to the Central African country’s decades-long search for a commercially

Brazilian energy giant Petrobras and Nigerian-owned Oranto Petroleum were the only companies to submit offers for Blocks 7, 8 and 9 before the June 30 deadline, according to specialist industry publication Upstream.

The National Petroleum Agency, known as ANP-STP, reportedly decided that the bids did not provide sufficient diversity or competition to proceed with awards.

The result is a striking one for one of Africa’s smallest economies. São Tomé had offered participating interests of up to 85%, terms promoted as unusually generous for an offshore licensing round in sub-Saharan Africa.

Companies could bid for one, two or all three blocks, provided they submitted separate technical and financial proposals for each.

Yet the terms were not enough to bring a wider group of international explorers into one of Africa’s least-tested deepwater basins.

A tiny African economy chasing a transformative discovery

São Tomé and Príncipe is a two-island country in the Gulf of Guinea, off the west coast of Central Africa.

Its economy grew by an estimated 2.1% in 2025, helped by tourism, improved electricity supply and stronger agricultural exports. However, real economic output per person remained stagnant, according to the World Bank.

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Tourism, cocoa and other agricultural products remain importanthas viewed offshore petroleum as a possible route to larger export revenues, infrastructure investment and faster economic growth

That makes the failed licensing round more consequential than the size of the country may suggest.

A major discovery could transform government finances. Another prolonged period without commercial success would leave São Tomé dependent on its existing, narrower economic base while neighbouring producers continue to benefit from hydrocarbons.

Offshore waters near São Tomé and Príncipe, a Central African island nation seeking its first commercial oil discovery.[

Two wells, but still no commercial oil

São Tomé’s waters are considered geologically promising because they sit in the Gulf of Guinea near established petroleum provinces, including those of Gabon and Equatorial Guinea.

But promising geology has not yet produced a bankable discovery.

Galp drilled the country’s first offshore exploration well, Jaca-1, in 2022. The well confirmed an active petroleum system but did not find a commercially

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Shell followed with the Falcão-1 well in Block 10 in late 2025. That campaign also gathered useful geological data but failed to establish commercial hydrocarbons.

Those results matter because deepwater exploration is expensive. Before committing hundreds of millions or potentially billions of dollars, oil companies must assess not only whether hydrocarbons are present, but whether the likely volumes can justify drilling, development infrastructure and years of operating costs.

São Tomé has established the first part of that equation. It has not yet proved the second.

Petrobras is still expanding in São Tomé

The weak auction result does not mean international companies have abandoned the country.

Petrobras completed the acquisition of a 75% operating interest in Block 3 from Oranto Petroleum on July 9. Following the transaction, Oranto retained 15%, while ANP-STP holds the remaining 10%.

Block 3 borders the acreage included in the failed round, giving both Petrobras and Oranto an existing strategic interest in the area.

Petrobras has been rebuilding its African exploration portfolio as it looks beyond Brazil for frontier basins with geological similarities to the prolific offshore fields on the opposite side of the Atlantic.

It also holds interests in other São Tomé blocks and has expanded elsewhere in Africa, including Namibia, where major discoveries have drawn some of the world’s biggest energy companies.

The contrast is important. Investors are still willing to fund African exploration, but capital is flowing most aggressively towards basins where discoveries have already reduced geological uncertainty.

Petrobras was one of only two companies that submitted bids for São Tomé’s latest offshore licensing round.businessday

Africa’s offshore investment race is becoming more selective

São Tomé is competing for the same exploration budgets as larger and more advanced African petroleum markets.

Namibia has become one of the world’s most closely watched frontier regions following major offshore discoveries.

Established producers such as Nigeria, Angola and the Republic of Congo can also offer existing infrastructure, decades of geological data and clearer routes to production.

Smaller entrants must therefore offer more than favourable ownership terms.

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Oil companies increasingly weigh the quality of seismic data, drilling depth, fiscal stability, regulatory certainty, access to export infrastructure and the time required to move from discovery to first production.

São Tomé’s offer of an 85% interest reduced one barrier, but it could not eliminate the more fundamental risk: no well has yet proved that its offshore petroleum system contains oil in commercially recoverable quantities.

Before the auction failed to produce a competitive field, ANP-STP Executive Director Álvaro Silva had said the country hoped to conclude petroleum contracts for the three blocks before the end of 2026.

That target is now in doubt. The government could reopen negotiations, revise the licensing process, seek direct talks with selected companies or wait for additional drilling and seismic data to improve the acreage’s commercial appeal.

It must also decide whether accepting a concentrated group of investors is preferable to leaving the blocks unlicensed while pursuing stronger competition.

For São Tomé, the danger is not simply that one auction failed. It is that repeated exploration disappointments could make generous fiscal terms less effective, forcing the country to wait longer for the discovery it hopes will reshape its economy.

For Africa’s other frontier producers, the lesson is equally sharp: ownership incentives may open the door, but proven geology increasingly decides who walks through it.