How Long Until Solar Pays for Itself in Nigeria
A commercial solar system in Nigeria typically pays for itself in 20–26 months when it replaces a diesel generator running 10–12 hours a day. Smaller systems (10–20kw) can break even in 14–18 months for businesses with high daytime diesel spend; larger systems (100kw+) with more grid dependence can take 28–34 months. After breakeven, the system produces power at a fraction of the diesel-equivalent cost for the remaining 17+ years of its life.
Prices last verified: 2026-08-08. See sources below.
Solar Payback Period by System Size
Based on Nigerian commercial properties replacing 10–12 hours a day of diesel generator run-time. Payback assumes typical installed cost per kw and pump price as of the verification date above; your actual figure depends on your current diesel and grid spend.
| System Size | Typical Installed Cost | Monthly Saving vs Diesel | Payback Period |
|---|---|---|---|
| 10–20kw | ₦6,500,000–₦12,000,000 | ₦350,000–₦650,000/mo | 14–18 months |
| 30–50kw | ₦18,000,000–₦28,000,000 | ₦900,000–₦1,400,000/mo | 18–22 months |
| 75–100kw | ₦32,000,000–₦48,000,000 | ₦1,600,000–₦2,300,000/mo | 20–26 months |
| 150kw+ | ₦55,000,000+ | ₦2,600,000+/mo | 28–34 months |
Diesel pump price benchmark: NNPC Ltd. retail price data. Grid tariff benchmark: NERC tariff schedule. Installed system cost and saving figures based on Olasupo Energy installed-project data, 2026-08-08.
The Month-by-Month Breakeven
Typical 100kw commercial breakeven
Month 22
Based on ₦2.5M/month diesel + electricity spend, ~₦42M installed system cost. Your figure depends on your load — use the calculator below for an exact number.
What Speeds Up or Slows Down Payback
Payback period isn't fixed — it moves with how much diesel a property was burning before switching. A business running a generator 10+ hours a day off expensive diesel has the most to save each month, so it recovers its installation cost fastest. A property with lighter, more occasional generator use, or one already leaning heavily on relatively stable grid power, sees a longer payback simply because the monthly saving is smaller.
System design matters just as much as system size. A correctly-sized system with the right split between panels, inverter capacity, and battery storage avoids the two most common payback killers: oversizing (paying for capacity that's rarely used) and undersizing (still needing meaningful diesel backup after installation, which drags out the breakeven point).
Financing structure changes the picture too. A business paying upfront starts saving from month one. A business financing the system over time has a longer path to full payback on paper, but often has positive monthly cash flow immediately, since the financed payment is usually lower than the diesel spend it replaces.
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Diesel vs Solar Cost Comparison
A full line-by-line monthly and 10-year cost breakdown.
Solar ROI as an Investment
IRR and yield framing for owners evaluating solar against other capital projects.
The True Cost of Your Generator
A full breakdown of fuel, parts, and downtime cost — diesel side only, in detail.
What Businesses Say About Their Payback
"We wanted to know exactly when the system would pay for itself before we signed off internally. Olasupo Energy gave us a clear month-by-month breakdown based on our actual diesel spend, and the real numbers have tracked closely with what they projected."
Ifeoma Balogun
Finance Director, Manufacturing, Lagos
"The payback timeline they gave us during planning turned out to be realistic, not a sales projection. Our diesel bill dropped from the first month, and the system was fully paid back within the window they quoted."
Bashir Suleiman
Facility Manager, Retail Group, Abuja
"What we appreciated most was that Olasupo walked us through the assumptions behind the payback number instead of just giving us a figure. It made the investment case easy to present to our board."
Grace Effiong
Managing Director, Hospitality, Port Harcourt
Reviews collected directly from Olasupo Energy clients. Names and businesses shown with permission.
Solar Payback Period — Common Questions
What is a good solar payback period in Nigeria?
For commercial systems replacing heavy diesel use (10–12 hours a day), 20–26 months is typical and considered strong. Anything under 24 months for a mid-size commercial system is a solid result given local diesel and installed-system pricing.
Does payback period include maintenance costs?
Yes. A properly calculated payback period nets out the small ongoing solar maintenance cost (panel cleaning, inverter checks) against the diesel maintenance and fuel cost it replaces, not just the fuel saving alone.
Why do smaller systems sometimes pay back faster than larger ones?
Smaller systems are often installed by businesses with very high diesel spend relative to their load — meaning the monthly saving is large relative to the smaller upfront cost. Larger systems sometimes serve properties with partial grid access already, which slightly lowers the monthly saving and extends payback.
What happens after the payback period ends?
The system keeps producing power for the rest of its 20+ year lifespan at a small fraction of diesel-equivalent cost. Every month after breakeven is effectively net saving, aside from minor ongoing maintenance and an inverter replacement typically needed once around year 10–12.
Want Your Exact Breakeven Month?
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