Nigeria spends something like $14 billion a year on diesel and petrol for private generators. The World Bank has tried to pin this number down through fuel import data and generator penetration surveys; the Bank's own researchers admit the informal generator economy is too large and too opaque to measure precisely. The Financial Times and Nigerian outlets like Punch and BusinessDay reported that after the naira devaluation following the June 2023 subsidy removal, businesses across Lagos saw fuel costs double within months. A shop owner in a Lagos commercial district burning 15 to 20 liters of diesel a day to keep a 10kVA generator running through eight hours of grid outage. Monthly fuel bill exceeding rent. IRENA's 2022 off-grid statistics put diesel electricity costs above $0.60 per kilowatt-hour at remote sub-Saharan sites. At urban commercial locations the number runs $0.30 to $0.50, assuming decent fuel quality, which is generous in markets where adulterated diesel is common enough to be a recognized operational hazard rather than an exception. Contaminated fuel damages injectors and cuts thermal efficiency, which means per-kilowatt-hour figures from clean-fuel laboratory testing understate what businesses actually pay. Generator mechanics are among the most reliably employed tradespeople in West African cities.
Ghana, Senegal, Tanzania, Cameroon, Uganda, the DRC, Mozambique all run their own versions of this. Nobody has produced a credible continent-wide aggregate diesel expenditure number. The data infrastructure to do so does not exist.