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Last updated at :
Jun 10, 2026
For factoryowners and plant heads in India, the energy bill is usually one of the topthree operating costs — and rising faster than every other line item.Industrial DISCOM tariffs have grown 6–8% annually for a decade and areprojected to keep rising as DISCOMs absorb subsidy burdens and pass-throughcosts. Solar power generated from your own rooftop or land, by contrast, has afixed, predictable per-unit cost for the next 25 years. This guide is thecomplete cost-and-ROI picture for industrial solar in 2026: what it actuallycosts by system size, how the three financing models compare, what tax benefitschange the maths, and how fast it pays back.
1. What 'Industrial Solar' Means — and Why the Economics Are Different
Industrial solar in India typically refers tosystems between 100 kW and 5 MW (above 5 MW it overlaps withutility-scale ground-mounted; below 100 kW it sits in the commercial-rooftopband). The customer profile is manufacturing units, warehouses, IT parks,pharmaceutical plants, textile mills, cold storage, hospitality and educationalinstitutions — entities consuming 10,000+ units of electricity per month on HTor LT-industrial tariffs.
Three structuraldifferences make the economics far more attractive than residential:
• Lower cost per Wp due toscale: Industrial systems cost ₹35–50per Wp vs ₹55–85 per Wp for residential. A 1 MW industrial plant costs roughly₹40 per Wp; a 5 MW plant under ₹35 per Wp.
• Much higher offsettariff: Industrial DISCOM tariffs of₹7–₹11/unit (versus residential ₹4–₹8/unit) mean every solar unit saves more,dramatically shortening payback.
• Tax-deductibledepreciation: Solar equipment qualifiesfor 40% accelerated depreciation in year one under Section 32 of theIncome Tax Act — a benefit residential buyers cannot claim. At a 30% corporatetax rate, this recovers roughly 12% of capital cost as tax saving in year one alone.
2. Industrial Solar Cost by System Size (2026)
Per-watt pricing falls as system size grows, thanks toeconomies of scale in modules, mounting, balance-of-system and labour. Here isthe typical 2026 cost band for rooftop industrial solar in India:
Costs are forgrid-tied rooftop installations using N-Type TOPCon or Bifacial modules withTier-1 string inverters and full balance-of-system. Ground-mounted projects atthe same capacity typically cost 10–15% more due to land preparation,foundations and transmission line requirements. Battery storage addsapproximately ₹50–₹70 lakh per MWh of usable capacity.
3. Three Financing Models — CAPEX vs PPA vs Group Captive
The financingmodel is the most important commercial decision in industrial solar — itdetermines upfront cost, ongoing tariff, ownership, and tax treatment. Here ishow the three models compare:
The choice oftencomes down to capital allocation philosophy. CAPEX offers the highest absolutelifetime savings but locks in capital for 3–5 years until payback. PPA isoperationally simpler — sign the agreement, start saving from day one, no asseton your books, no depreciation accounting — but you give up the long-termfree-electricity upside in years 6–25. Group Captive is the structural sweetspot when multiple C&I users can come together, because it captures the CSSexemption that Third-Party PPAs cannot.
4. The Accelerated Depreciation Advantage
Section 32 of theIncome Tax Act 1961 allows solar equipment owners to claim accelerateddepreciation at 40% in year one, plus an additional 20% in the same year if theequipment is part of an existing block (for tax-paying companies). Thissignificantly reduces effective project cost. Here is the math for a typical ₹4crore (1 MW) CAPEX project assuming a 30% corporate tax rate:
5. What ₹3.5 Crore (1 MW) Actually Buys You — Component Breakdown
A transparent EPCquote for a 1 MW industrial rooftop solar system should itemise everycomponent. Here is the typical breakdown for a 1 MW grid-tied rooftopinstallation in 2026: