The True Cost of Running a Diesel Generator in Nigeria
A mid-size commercial diesel generator (30–50kva) running 10–12 hours a day costs a Nigerian business ₦900,000–₦1,400,000 a month once fuel, servicing, parts, and lubricants are all counted — not just the diesel receipt. Over 10 years that's ₦108M–₦168M, before counting the downtime cost of breakdowns and the generator replacement most businesses need at least once in that window.
Prices last verified: 2026-08-08. See sources below.
Monthly Running Cost by Generator Size
Based on Nigerian commercial properties running a generator 10–12 hours a day. Figures include fuel, routine servicing, lubricants, and an amortized allowance for parts and overhaul — not fuel alone. Your actual figure depends on run-time, load factor, and generator age.
| Generator Size | Fuel Cost/mo | Service & Parts/mo | Total Running Cost/mo |
|---|---|---|---|
| 10–15kva | ₦280,000–₦420,000 | ₦70,000–₦110,000 | ₦350,000–₦530,000 |
| 20–33kva | ₦520,000–₦780,000 | ₦130,000–₦190,000 | ₦650,000–₦970,000 |
| 30–50kva | ₦720,000–₦1,100,000 | ₦180,000–₦300,000 | ₦900,000–₦1,400,000 |
| 100kva+ | ₦1,600,000+ | ₦400,000+ | ₦2,000,000+ |
Diesel pump price benchmark: NNPC Ltd. retail price data. Service and parts figures based on Olasupo Energy client-reported generator maintenance data, 2026-08-08.
Where the Money Actually Goes
Typical 50kva generator, 10-year total
₦140M+
Includes fuel, routine service, parts and overhaul, and one full generator replacement. Doesn't include downtime cost — see below.
The Costs Most Businesses Don't Count
Fuel is the cost every business owner already knows about, because it's the one written on a receipt every few days. It's rarely the full picture. Routine servicing — oil changes, filter replacement, injector cleaning — adds up on its own schedule, and heavier overhaul work (alternator, engine rebuild) tends to hit in an unplanned lump sum rather than a predictable monthly line.
Downtime is the cost that's hardest to see on paper but often the most expensive in practice. A generator that fails during business hours doesn't just stop producing power — it stops production, cold storage, POS systems, or whatever the business depends on electricity for, for as long as it takes to get a technician and the right part.
Generator lifespan is the last piece. A well-maintained diesel generator running heavy commercial hours typically needs a major overhaul or full replacement within 6–10 years — a cost that's easy to forget when comparing "generator" to "solar system" on a single month's fuel bill.
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What Businesses Say About Their Generator Cost
"We'd always tracked fuel spend but never the service and parts side properly. When Olasupo Energy broke it all down together, the real monthly number was much higher than what we'd been reporting internally."
Emeka Obiora
Plant Manager, Manufacturing, Lagos
"A generator failure once cost us a full batch of stock. That's the number that finally made the diesel-vs-solar conversation urgent for us, not the fuel receipts."
Blessing Adeyemi
Owner, Cold Storage, Ibadan
"Seeing fuel, service, and the eventual replacement cost laid out together made it obvious why our generator was costing far more than the monthly diesel bill suggested."
Yusuf Aliyu
Facility Manager, Hospitality, Abuja
Reviews collected directly from Olasupo Energy clients. Names and businesses shown with permission.
Diesel Generator Running Cost — Common Questions
How much does it cost to run a generator for a business in Nigeria per month?
For a mid-size commercial generator (30–50kva) running 10–12 hours a day, all-in monthly cost — fuel, servicing, and amortized parts — typically runs ₦900,000–₦1,400,000. Fuel alone is usually 65–70% of that figure.
What's included in 'true cost' beyond fuel?
Routine servicing (oil changes, filters, injector cleaning), parts and overhaul work, and an amortized allowance for eventual replacement. Fuel is the most visible cost but usually isn't more than two-thirds of the real total.
How long does a commercial diesel generator last?
A well-maintained generator running heavy commercial hours typically needs a major overhaul or full replacement within 6–10 years, depending on run-time and maintenance quality. That replacement cost is easy to leave out of a simple fuel-cost comparison.
Does downtime cost get included in these figures?
The table above covers direct running cost only — fuel, service, and parts. It doesn't put a number on lost production, spoiled inventory, or halted operations during a breakdown, which varies too much by business type to generalize, but is often the single largest cost of generator dependence.
Want to Know What Your Generator Really Costs?
Send us your generator size and monthly diesel spend on WhatsApp. We'll send back a real, itemized running-cost breakdown for your property — free, no obligation.
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