On 1 April 1977 Decree No. 33 merged NNOC with the Federal Ministry of Petroleum Resources to create the Nigerian National Petroleum Corporation (NNPC) — a state oil company that was also its own regulator, its own auditor and (until 1988) its own training college. The structural conflict of interest written into NNPC's birth certificate is the constant of every oil-sector scandal that followed.
Between 1965 and 1989 the federal government built four refineries, each timed to a different political pressure. Port Harcourt I (1965, 38,000 b/d) was a Shell-BP design from the late colonial period. Warri (1978, 125,000 b/d) was Gowon's post-war reconstruction symbol. Kaduna (1980, 110,000 b/d) was Shagari's northern offset — built in a city with no crude pipeline of its own and supplied by a 660km link from Escravos. Port Harcourt II (1989, 150,000 b/d) was IBB's response to the SAP-era fuel queues. Combined nameplate capacity: 445,000 b/d — more than enough to refine every litre of petrol, diesel and kerosene Nigeria consumed in 1989. By 2010 combined actual output was below 80,000 b/d. By 2019 all four were producing zero. Nigeria became the only OPEC founding member that imported 100% of its refined petroleum products.
The collapse was not an accident. The joint-venture cash-call system — in which NNPC, holding 55–60% equity, was required to fund its share of operating and capital expenditure for every JV — meant that any time federal oil revenue dipped, the first item cut was NNPC's own cash call. By 1995 NNPC was over $2 billion in arrears to its JV partners; by 2009 the figure exceeded $6 billion. Underfunded JVs cut maintenance; underfunded refineries skipped turnarounds; the Kaduna catalytic cracker, designed for a 4-year cycle, ran 11 years without a major overhaul before the 1996 fire that put it out of commission for six years.
The second collapse was political. From 1985 onward, the Petroleum (Special) Trust Fund (Buhari I), the Dedication Account (IBB), the Special Dedication Account (Abacha) and the various 'NNPC Crude Lifting' arrangements turned the refineries' inefficiency into a private opportunity: imported petroleum products attracted subsidy; subsidy attracted forged 'turn-around-maintenance' contracts; the Halliburton bribery case (2010), the 2012 fuel-subsidy probe, the Diezani Alison-Madueke EFCC indictments and the OPL 245/Malabu scandal all sit downstream of the same arithmetic. By 2019 the refineries were, on paper, undergoing rehabilitation; by 2024 they remained mostly closed, with PH II producing the first commercial drop of petrol in November 2024 after nine years of turnaround promises. The institutional question — whether a state corporation that is its own regulator can ever rebuild what its own ministers profit from leaving broken — is the question NNPC's 2021 conversion to a limited liability company was supposed to settle. It did not.
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.