The government-owned refineries, being run by the Nigerian National Petroleum Corporation, reported a total loss of N778.71bn from 2015 to 2019, an analysis of data collated from their financial statements has shown.
The refineries generated total revenue of N21.12bn in the five-year period as they operated at below their full capacities.
The refineries, which are located in Port Harcourt, Kaduna and Warri, have a combined installed capacity of 445,000 barrels per day.
The country relies largely on importation of refined petroleum products as its refineries have remained in a state of disrepair for many years despite several reported repairs.
Port Harcourt Refining Company generated a total revenue of N10.33bn from 2015 to 2019, but posted a loss of N229.14bn.
The refinery generated zero revenue in 2019; N1.46bn in 2018; N4.82bn in 2017; N3.37bn in 2016, and N683.52m in 2015.
It lost N50.53bn in 2019; N45.59bn in 2018; N53.77bn in 2017; N43.44bn in 2016, and N35.81bn in 2015.
Kaduna Refining and Petrochemical Company reported revenue of N4.17bn and a loss of N307.27bn in the five-year period.