Between April 1971 and August 1979 Nigeria moved from a country whose oil was owned, priced, shipped and refined by foreign companies to a country that — at least in law — owned everything from the wellhead to the tanker. Four instruments did the work: the Nigerian National Oil Corporation Decree (NNOC, April 1971), OPEC membership (July 1971), the Indigenisation Decrees (1972 and 1977) and the nationalisation of BP's Nigerian assets (1 August 1979).
NNOC, created by Decree No. 18 of 1971, was Yakubu Gowon's vehicle for taking equity in the foreign-owned producing joint ventures. By 1973 the federal government held 35% of Shell-BP, Mobil, Gulf, Agip and Elf; by 1974 it was 55%; by 1979 the standard joint-venture equity was 60% federal, 40% foreign — the same ratio that still governs every major upstream operation today. OPEC membership, joined in July 1971, gave Nigeria the institutional cover to push posted prices upward; by January 1974 the 1973 Yom Kippur embargo had quadrupled the price of Bonny Light from $3 to $14 a barrel, and Nigerian oil revenue jumped from ₦510m (1970) to ₦5.4bn (1975) — a tenfold real increase in five years.
The Indigenisation Decrees (NEPD 1972, revised 1977) extended the logic from oil into the broader economy: 40 enterprise categories reserved for Nigerians; equity transfers from foreigners to nationals worth, by 1980, more than £400 million. Most of that ownership transfer landed with the new urban business class — the Folawiyos, Aliko Mohammeds, M.K.O. Abiolas — and consolidated the federal capital as the gatekeeper to wealth. The 1973 Petroleum Decree, meanwhile, formalised the lease-and-licence regime that survives in the 2021 Petroleum Industry Act.
The culminating act was the August 1979 nationalisation of British Petroleum, ordered by Obasanjo's outgoing military regime in retaliation for BP's continued supply of crude to apartheid South Africa via the British 'oil swap'. Overnight, BP's 20% of Shell-BP became NNPC's; BP-branded service stations across Nigeria were rebranded African Petroleum (AP) within thirty days; the Margaret Thatcher government, three months old, had no leverage to reverse it. By the time the Second Republic was sworn in on 1 October 1979, the federal government had become the dominant equity-holder in every barrel produced in Nigeria — and the dominant rent-collector in an economy that would, within two years, discover what happens when the rent stops growing. The Oil Decade was the visible spending; this Act IV was the legal architecture that made the spending federal in the first place.
Figure 1
Nigerian crude oil production, 1958–2024 (million barrels per day)
From the first 5,100-barrel cargo out of Oloibiri in February 1958 to a 2.44 mbpd peak in 2005, then a long decline of theft, divestment and force majeure.
Figure 2
Refining capacity and utilisation, 1965–2024
Four state refineries were built; none ran consistently above 50% after 1995; by 2020 official utilisation was zero. Dangote 2024 doubled installed capacity overnight.