Nigeria's offshore energy regime has historically developed around the regulation of petroleum resources, reflecting the country's economic dependence on hydrocarbons and the central role of offshore oil and gas production in national development. However, the global energy transition, emerging offshore renewable technologies and the increasing economic significance of the maritime domain are challenging the assumptions upon which traditional offshore regulation has been constructed. This article examines whether Nigeria's existing legal framework is capable of governing an offshore energy future that extends beyond petroleum extraction. The article argues that the central challenge facing Nigerian offshore energy law is not the absence of regulation but the continued conceptualisation of offshore areas primarily as repositories of extractive resources rather than as shared maritime spaces requiring coordinated governance. Through an analysis of constitutional provisions, particularly section 44(3) of the Constitution of the Federal Republic of Nigeria 1999 (as amended), the Petroleum Industry Act 2021, the Electricity Act 2023, maritime legislation and relevant principles of international law under the United Nations Convention on the Law of the Sea, the article identifies the legal and institutional difficulties likely to arise as offshore activities diversify. It contends that while Nigeria possesses a sophisticated petroleum regulatory framework, existing legal structures provide limited guidance on the allocation of offshore space, coordination between competing regulatory institutions and the coexistence of petroleum operations with emerging industries such as offshore renewable energy, carbon capture and marine infrastructure. Drawing upon comparative experiences from jurisdictions including the United Kingdom, Norway and other maritime energy markets, the article demonstrates that successful offshore governance increasingly requires a shift from sector-specific regulation towards integrated management of maritime space. The article proposes the development of an integrated offshore energy jurisprudence for Nigeria, one that preserves the strengths of petroleum regulation while expanding the legal conception of offshore governance beyond resource extraction. It argues that the future of Nigerian offshore energy law lies not in replacing petroleum-centred regulation but in developing a broader legal framework capable of managing a diverse maritime economy in which energy security, environmental protection, investment certainty and competing ocean uses can coexist.