The decommissioning of oil and gas facilities is no longer a remote possibility and has taken a central role on the country’s regulatory agenda. Although some assets may, in theory, undergo revitalization — a movement that even led Petrobras to cut its projections by USD 1.1 billion — the prospect of the definitive abandonment of dozens of fields and systems by the next decade is already a reality. This context projects a scenario in which legal governance becomes as important as the engineering and investments involved. It is no coincidence that Petrobras expects to invest about USD 9.9 billion in platform decommissioning by 2029, highlighting the scale and complexity of the regulatory, contractual and financial challenge ahead.
Petrobras’s most recent tenders to contract decommissioning services, accompanied by the respective Contractual Responsibility Matrix, show a sector that is maturing quickly, but also reveal emerging legal issues that still need further exploration, especially regarding risk allocation, economic rebalancing mechanisms and contractual responsiveness to regulatory volatility.
The model currently adopted by Petrobras is operationally solid. The Responsibility Matrix precisely allocates the essential tasks: the contractor must prepare environmental studies, provide the technical basis for licensing, carry out the abandonment, conduct the PRAD (Degraded Area Recovery Plan) and prove the segregation and final disposal of waste. Final delivery, with the issuance of the Demobilization and Quality Acceptance Certificate, consolidates a documented and auditable process. It is an important institutional advance that brings Brazil closer to international standards of post-operational responsibility.
But as technical governance consolidates, the focus shifts to an area still under development: the legal engineering of decommissioning. The matrix defines “who does what”, but the legal system also requires defining “who bears what”, especially when environmental agencies and regulators impose new conditions, when environmental parameters change during execution or when unmapped environmental liabilities emerge. These events, typical of end-of-life projects, are not the exception; they are an intrinsic part of the process. The absence of economic rebalancing mechanisms linked to such events creates a vacuum that can distort prices, reduce predictability and drive away qualified players.
This scenario is particularly relevant in a sector regulated by multiple authorities. Decommissioning involves the ANP (National Agency of Petroleum, Natural Gas and Biofuels), Ibama, state agencies and, in certain cases, the Brazilian Navy. Each authority has its own powers, and the interaction between them can generate overlapping requirements, new conditions or operational adjustments on different timelines. The absence of clauses governing this “dynamic regulatory environment” — as occurs in infrastructure projects, PPPs (Public-Private Partnerships) and concessions — leads bidders to price in broad contingencies when preparing their proposals, which affects the economic efficiency of the tender and reduces granularity in the treatment of risks.
Another sensitive point, whose incorporation into current instruments could be discussed, concerns phased environmental guarantees. The matrix imposes robust obligations (PRAD, final documentation, proof of waste disposal), but the contract does not link these operations to financial instruments modulated by phase. In projects where a large part of the environmental obligations is fulfilled after the physical intervention, phased guarantees increase legal certainty, reinforce the right incentives and reduce the risk of partial environmental default.
This does not mean a lack of governance; quite the opposite. It means that the technical progress of the tender documents creates the conditions for the legal debate to move forward as well. Decommissioning ushers in a phase in which the Law plays a structural role in the economic, social and environmental efficiency of the sector. The challenge is to ensure that the sophistication of the operational matrix is matched by contractual mechanisms for regulatory rebalancing, modulated environmental guarantees and institutional interface protocols. What matters is that the rules governing the operation allocate each risk to the party that can actually handle it most effectively and economically efficiently, rationalizing the burdens of the relationship in favor of a mature and sustainable partnership.
Brazil is thus entering the second legal wave of decommissioning. The first, marked by the clear definition of operational responsibilities, has been consolidated. The second, focused on incorporating legal mechanisms that respond to regulatory and environmental unpredictability, is just beginning. In this process, Petrobras and the market have the opportunity to build a model that combines technical robustness, legal certainty and regulatory convergence.
In a sector dealing with complex assets, multiple authorities and strong social and environmental scrutiny, decommissioning is as much an industrial and engineering operation as a legal one. The future of Brazilian decommissioning will be written at the intersection of rules, contracts and platforms; and it is precisely at this intersection that its new frontier of institutional maturity lies.
