Commercial Solar Plant in Delhi — Cost, GBI, Depreciation and Payback for Businesses

A commercial solar plant in Delhi can cut a business’s electricity bill by a large share and pay for itself in roughly three to five years. Commercial and industrial (C&I) users pay higher tariffs than homes, which makes the savings per solar unit bigger. Add the Delhi Generation Based Incentive and tax depreciation, and rooftop solar becomes a serious financial decision rather than just a green one.

This guide is written for factory owners, shop and office owners, warehouses, schools and hospitals in Delhi NCR. It covers cost, savings, incentives, ownership models and the technical checks that decide whether your roof is ready.

How Much Does a Commercial Solar Plant in Delhi Cost?

Commercial systems cost less per watt than home systems because of scale. Indicative turnkey prices for a rooftop plant in 2026 are roughly ₹38 to ₹50 per watt for systems between 50kW and 200kW, depending on roof type, structure, inverter design and site conditions.

Plant size	Indicative cost	Roof area needed	Annual generation (approx.)
25 kW	₹11 – ₹14 lakh	2,500 sq ft	36,000 units
50 kW	₹20 – ₹25 lakh	5,000 sq ft	72,000 units
100 kW	₹40 – ₹50 lakh	10,000 sq ft	1,45,000 units
200 kW	₹78 – ₹95 lakh	20,000 sq ft	2,90,000 units

These are indicative figures, not quotations. Final pricing depends on shading, roof strength, cable runs, transformer distance and the quality of equipment. Never compare quotes without a component-wise breakup.

Is a Subsidy Available for a Commercial Solar Plant in Delhi?

No. The central residential subsidy of up to ₹78,000 applies only to residential connections. If a vendor quotes a subsidy-inclusive price for a business roof, ask them to show the scheme rule. Commercial buyers rely on the Delhi GBI, net metering and tax benefits instead.

Delhi GBI for Commercial and Industrial Consumers

Under the Delhi Solar Policy 2024, commercial and industrial consumers can receive a Generation Based Incentive of ₹1 per unit for five years, for installations within the capacity cap announced in the policy. This is on top of the electricity you save.

For a 100kW plant generating about 1,45,000 units a year, that is roughly ₹1.45 lakh a year in GBI. Check current availability on the Delhi Solar Portal, because the incentive was announced for a limited initial capacity.

Accelerated Depreciation: The Biggest Financial Lever

Businesses that own a solar plant can claim accelerated depreciation under the Income Tax Act. In 2026, solar plant qualifies for a 40% depreciation in the first year, with the balance depreciated in later years. For a profitable business, this lowers taxable income and improves the effective return.

For example, on a ₹45 lakh plant, a 40% first-year depreciation is ₹18 lakh. At a 25% to 30% tax rate, the tax saving is roughly ₹4.5 lakh to ₹5.4 lakh in the first year. Rules and rates change, so discuss this with your chartered accountant before you decide. Only the asset owner can claim it.

Payback Example: 100kW Commercial Solar Plant in Delhi

• Plant cost: about ₹45 lakh
• Annual generation: about 1,45,000 units
• Commercial tariff saved: assume ₹8 per unit, giving about ₹11.6 lakh a year
• Delhi GBI: about ₹1.45 lakh a year for five years
• Tax saving from depreciation: about ₹4.5 lakh to ₹5.4 lakh in year one

Simple payback without tax benefits is about 3.5 to 4 years. With depreciation, it can come down further. Your actual tariff may be higher or lower, so use your last 12 months of bills to model it. Our solar ROI calculator guide explains the method.

CAPEX, OPEX and Other Ownership Models

Model	How it works	Best for
CAPEX (own the plant)	You pay upfront or through a loan, and claim depreciation	Profitable businesses that want the highest long-term return
OPEX / PPA (RESCO)	A developer owns the plant and you pay per unit consumed	Businesses that want zero upfront cost and simple accounting
Hybrid	Part ownership with a service agreement	Businesses with specific cash-flow or tax needs

Depreciation is normally claimed by the owner, so in an OPEX model it benefits the developer, not you. Compare the per-unit price you pay against what you would save by owning.

Technical Checks Before You Buy a Commercial Solar Plant in Delhi

1. Roof condition: RCC and sheet roofs need different structures. Old asbestos or weak sheets need strengthening.
2. Shadow-free area: allow about 100 sq ft per kW. Water tanks, parapets and neighbouring buildings cut usable space.
3. Sanctioned load and transformer: net-metered capacity is generally limited by your sanctioned load, and your transformer needs headroom to take exported power.
4. Inverter design: string inverters give easier fault isolation than one big central unit on most commercial roofs.
5. Safety and earthing: proper lightning protection, surge arresters and fire safety are essential on industrial sheds.
6. Monitoring: insist on string-level monitoring so you can see losses early.

Net Metering for a Commercial Solar Plant in Delhi

Commercial consumers in Delhi can also use net metering, with the DISCOM inspecting the system before the meter is installed. The process is similar to the home route covered in our guide to net metering in Delhi. Plan for feasibility approval, load verification and inspection, and allow several weeks.

Typical Timeline for a Commercial Solar Plant in Delhi

• Week 1–2: site survey, bill analysis and proposal.
• Week 2–4: design, quotation, order and DISCOM feasibility application.
• Week 4–8: material delivery and installation, depending on size.
• Week 8–12: testing, inspection, net meter and commissioning.

Common Mistakes When Buying a Commercial Solar Plant in Delhi

• Sizing the plant to the roof instead of to daytime consumption.
• Buying on the lowest per-watt price without checking the inverter, structure and cables.
• Skipping a transformer and sanctioned-load check.
• Ignoring maintenance. See our solar maintenance guide, because dust in Delhi can cost 10–18% of output.
• Not consulting a CA about depreciation before choosing CAPEX or OPEX.

Conclusion

A commercial solar plant in Delhi usually pays back in about three to five years, helped by high commercial tariffs, the ₹1 per unit GBI where available, and accelerated depreciation for owners. The key decisions are plant size, ownership model, and engineering quality. Start with your bills and roof, and ask for a written proposal that shows generation, savings and payback.

Get a Free Quote from Solar Squad

Solar Squad is a Delhi-based EPC partner for solar design, supply and installation for homes, businesses and industry. Contact us with your last 12 months of electricity bills for a free site survey and a payback estimate.

Official Sources and Further Reading

• Delhi Solar Portal — incentives and GBI
• Delhi Electricity Regulatory Commission
• MNRE — ALMM approved list

FAQs

What is the cost of a commercial solar plant in Delhi?

Commercial rooftop plants between 50kW and 200kW typically cost about ₹38 to ₹50 per watt in 2026, so a 100kW plant is roughly ₹40 lakh to ₹50 lakh. Actual cost depends on roof type, structure and equipment.

Do businesses get a subsidy for solar in Delhi?

The central PM Surya Ghar subsidy is for residential connections only. Businesses can use the Delhi GBI of ₹1 per unit where available, net metering and tax depreciation.

What is accelerated depreciation on solar?

It is a tax benefit that lets the owner of a solar plant claim a higher depreciation rate, currently 40% in the first year. Confirm the current rule with your chartered accountant.

How much roof area is needed for a 100kW solar plant?

About 10,000 sq ft of shadow-free roof, or roughly 100 sq ft per kW.

Is CAPEX or OPEX better for a commercial solar plant?

CAPEX gives the highest long-term return and allows depreciation, while OPEX removes the upfront cost. The better option depends on your tax position, cash flow and risk appetite.