Solar vs Generator in Lagos — Which Is Actually Cheaper
Running costs from live petrol prices · payback maths · 8h daily outage assumption
The honest comparison between solar and a generator is not about which is cleaner or more modern. It is a arithmetic question with three inputs: what you pay upfront, what you pay per unit of electricity afterwards, and how long you intend to stay where you are. Change the petrol price and the answer changes with it — which is exactly what happened in Lagos this July.
NNPC raised its Lagos pump price to about ₦1,300 on 21 July, up ₦182 from ₦1,118, after Dangote briefly suspended naira petrol sales between 15 and 22 July and truck loading halted for six days. Independent marketers quoted ₦1,350–₦1,400. Every naira on the pump price shortens the solar payback — and fuel is still volatile, so treat any payback figure here as an estimate tied to today's price.
Fuel only, at 8 hours a day and ₦1,255 per litre (NNPC Lagos, 2026-08-10). Excludes oil, servicing and eventual replacement.
| Generator | Per day | Per month | Per year |
|---|---|---|---|
| “I better pass my neighbour” (0.9kVA) ~0.5 L/hr | ₦5.0K | ₦150.6K | ₦1.8M |
| 2.5kVA petrol ~1.2 L/hr | ₦12.0K | ₦361.4K | ₦4.4M |
| 5kVA petrol ~2 L/hr | ₦20.1K | ₦602.4K | ₦7.3M |
| Tier | Installed | Saves/mo | Payback |
|---|---|---|---|
| Basic | ₦350.0K–₦1.8M | ₦15.0K | 30mo |
| Standard | ₦1.2M–₦2.0M | ₦45.0K | 36mo |
| Premium | ₦2.5M–₦4.5M | ₦80.0K | 42mo |
| Off-grid | ₦5.0M–₦12.0M | ₦150.0K | 48mo |
The savings and payback in this table come from the package data (verified 2026-06-17) and assume solar displaces most of the generator running cost above. If your outage is shorter than 8 hours a day, your savings are lower and payback is longer.
A generator is cheap to buy and expensive to feed
The whole case for a generator is the upfront number. A small petrol set costs a fraction of even the entry solar tier, which is why it is what most Lagos households reach for first. The cost arrives later and continuously, in fuel, oil, servicing and eventual replacement — a petrol generator run daily is generally considered a three-to-five year machine, not a fifteen-year one.
Fuel is the dominant term and the volatile one. A small generator consumes roughly a litre an hour under moderate load, so the daily cost is essentially the pump price multiplied by your hours of outage. That makes the generator's running cost a direct function of a number nobody controls, and it moved sharply in July 2026.
Solar inverts the shape of the cost
Solar front-loads almost everything. You pay for panels, inverter, battery and labour once, and the marginal cost of the next kilowatt-hour is close to zero for the life of the equipment. There is no fuel queue, no jerrycan, no servicing interval, and no exposure to the pump price at all.
The catch is that the front-loaded cost is real money and the payback is measured in years, not months. That is why the comparison is only favourable if you are staying put: a tenant on a one-year lease is buying an asset they may have to move or leave, while an owner-occupier is buying down a bill they would otherwise pay forever. The battery is also the component that will need replacing first, so an honest lifetime comparison budgets for one replacement inside the panels' 25-year life.
Fuel, oil, servicing and how long a generator really lasts in Lagos.
Payback only means something once you know the system your house needs.