Over a five-year window, a solar street light usually wins on total cost because it removes the two biggest hidden expenses of grid lighting: the cabling/trenching needed to reach each pole, and the monthly electricity bill that keeps rising. Solar costs more upfront, but with zero running electricity and a single battery service cycle, most B2B installations recover the gap and then run close to free. Below is the honest, line-by-line breakdown so you can model it for your own site.
Why the sticker price is the wrong number
When buyers compare a grid-connected LED street light to a solar one, they usually look only at the upfront price of the pole and fixture. That misses where the money actually goes over the life of the installation. A grid light is cheap to buy and expensive to run and connect; a solar light is the reverse. The right way to decide is total cost of ownership (TCO) - everything you pay across five years, not just day one.
For grid lighting, the cost drivers beyond the fixture are cable trenching to reach each pole, the metered electricity that accrues every night, and maintenance on cabling and transformers. Industry cost breakdowns consistently show trenching and cabling - not the lamp as the single largest line item in grid street-lighting projects.
The recurring cost that decides it: electricity
This is the part you can calculate today. A ~100W grid street light running about 11 hours a night uses roughlyย 400 units (kWh) of electricity per year. Commercial and industrial tariffs across most Indian states run roughly โน7-โน11 per unit on typical slabs, and several state commissions revised tariffs upward again for FY 2026.
Estimate, based on the cited state commercial/industrial tariff ranges and the runtime and wattage assumptions above. Your actual runtime, wattage, and tariff slab will vary and since tariffs have historically risen year on year, treat the grid figure as a floor, not a ceiling.
That electricity line is per pole. Multiply by the number of poles on your site, and the five-year grid bill alone often approaches or passes the price difference between the two systems.
Total cost of ownership: the full picture
Where solar wins fastest
Solar's advantage is largest exactly where grid is most expensive to reach: perimeters, access roads, parking areas, factory and warehouse yards, township approach roads, and any pole far from an existing connection. In those cases you avoid a large trenching bill and the running cost, so payback is quickest. Where a grid line already runs to the spot and electricity is cheap, the gap is smaller we would tell you that honestly rather than oversell solar for every pole.
How to model it for your own site
- Count your poles and the approximate wattage per pole.
- Estimate nightly runtime (dusk-to-dawn is ~11-12 hours).
- Multiply to get annual units, then by your actual commercial tariff for the yearly electricity bill.
- Add your quoted trenching/cabling for grid this is where grid gets expensive.
- Compare that five-year grid total against the solar upfront (plus one battery service).
You can run these numbers quickly with our Solar Light ROI Calculator, then browse suitable hardware in our Solar Street Lights range. For factory and warehouse yards, the same logic applies to our Solar Flood Lights.
The bottom line
Grid street lighting looks cheaper on day one and rarely is by year five. Once you count cabling and a rising electricity bill, solar's higher upfront cost is usually recovered within the window and every year after runs close to free. Model your own poles, tariff and trenching before you decide; the maths, not the brochure, should make the call.
