São Tomé and Príncipe's national petroleum agency, ANP-STP, signed the Second Addendum to the Production Sharing Contract for Block 3 of the country's Exclusive Economic Zone on 9 July 2026, formally installing Petrobras as operator of the block. The addendum follows Petrobras's acquisition of an interest that previously conferred operatorship on another party, and its signature at the ANP-STP level constitutes a ratified contractual amendment — not merely a memorandum of intent.
The move marks a significant upgrade in the quality of sponsorship behind Block 3. Petrobras brings deepwater technical capability and a substantial balance sheet, factors that historically accelerate a block's progression from exploration commitment to drill decision. São Tomé and Príncipe has long been regarded as an underexplored Atlantic frontier; its blocks sit in the same broad Gulf of Guinea hydrocarbon province that has produced major discoveries in Nigerian and Equatorial Guinean waters. With Petrobras now formally in the operator seat, the probability of a structured work programme — seismic acquisition, prospect maturation, and eventually a well — increases materially.
For the São Tomé and Príncipe government, the operatorship change is strategically important. Petrobras's track record in deepwater Brazil and its growing African portfolio gives ANP-STP a credible counterpart capable of financing and executing an exploration campaign without requiring immediate co-financing from the state. The Second Addendum formalises all rights, obligations, and carried interests that flow from the ownership transfer, providing the legal certainty investors and service companies require before committing resources.
Norwegian oil and gas service companies should treat this addendum as a monitoring trigger rather than an immediate procurement opportunity. Petrobras has not yet announced a work programme, drill schedule, or tender process for Block 3. The correct posture at this stage is to map the block's technical requirements, identify Petrobras's preferred supplier relationships in comparable Atlantic deepwater settings, and position Norwegian firms within those networks ahead of any formal solicitation. Companies with Gulf of Guinea project references — subsea equipment, marine surveys, or well services delivered elsewhere in the region — will carry the most relevant credentials when Petrobras moves toward procurement.