Commercial Solar ROI: Why Factories Are Going Solar First
A 3–4 year payback, accelerated depreciation and decades of near-free power. Here's the business case for commercial and industrial rooftop solar.
For a factory or warehouse, the roof is usually dead space. Solar turns it into one of the best-returning assets on the balance sheet. Here's the business case, in numbers.
The headline: 3–4 year payback
Commercial and industrial (C&I) rooftops typically pay back in 3–4 years — faster than residential — for three reasons:
- Higher tariffs. Businesses pay more per unit than homes, so each solar unit saves more.
- Daytime load. Factories and offices consume power exactly when the sun shines, maximising self-consumption.
- Accelerated depreciation. Tax benefits let you write down the asset quickly.
After payback, you get 20+ years of near-free power — a powerful hedge against rising grid tariffs.
A worked example
Take a unit with a ₹3,00,000/month bill and a large rooftop:
| Metric | Value |
|---|---|
| Recommended system | ~250 kW |
| Indicative cost | ~₹1.1 Cr |
| Annual savings | ~₹38–42 lakh |
| Payback | ~3 years |
| 25-year savings | ₹9 Cr+ |
Numbers vary with location, load profile and roof — but the shape is consistent across sectors.
CAPEX or zero-upfront?
You have two routes:
- CAPEX — you own the system, capture full savings and depreciation benefits. Best long-term ROI.
- OPEX / PPA — a developer funds and owns the system; you simply pay a lower per-unit rate. Zero upfront capital.
Cash-rich businesses usually choose CAPEX for the superior returns; those protecting working capital often prefer a PPA. We model both so you can compare side by side.
Beyond the rupees: ESG
Solar generation comes with verified carbon-offset reporting you can put straight into ESG disclosures, tenders and customer communications. For many B2B buyers, that's becoming a requirement, not a nice-to-have.
Why it's project-managed end to end
Commercial installs involve structural assessment, single-line diagrams, DISCOM approvals and safety compliance. Brightly assigns a dedicated account manager and a vetted EPC partner, so your team stays focused on operations — with zero downtime during installation.
Next step
See the indicative ROI for your facility with the savings calculator, or request a commercial proposal and we'll model CAPEX vs PPA for your exact load.
Ready to see your numbers?
Get free, no-obligation quotes from Brightly-certified installers — or estimate your savings in 60 seconds.
