Direct answer: Commercial and industrial rooftop solar is most valuable when a facility has strong daytime electricity demand, secure roof rights and a tariff that solar can economically offset. The project should be sized from interval load data and evaluated through engineering, regulatory, financial, tax and contractual due diligence. Residential PM Surya Ghar CFA does not apply to ordinary C&I connections. |
Commercial and industrial establishments often have high daytime electricity demand and large unused roof areas. A properly designed rooftop solar system can reduce grid-electricity purchases, improve energy-cost predictability and support sustainability goals.
Solar is suitable for factories, warehouses, offices, hospitals, hotels, schools and retail facilities. The financial outcome depends on electricity consumption, tariffs, roof conditions, system capacity and local regulations.
Quick Takeaways
- Use 12 months of bills plus interval demand data; annual consumption alone cannot show daytime self-consumption, demand peaks or export exposure.
- Assess roof condition, structural capacity, wind, fire access, shutdown windows, transformer and switchgear capacity, harmonics, earthing and evacuation before locking capacity.
- CAPEX usually maximizes retained savings but requires capital and asset management; OPEX or PPA can preserve capital but creates long-term contractual obligations.
- Model energy charges, demand charges, banking or export treatment, downtime, degradation, O&M, inverter replacement, insurance, tax and financing separately.
- Use real projects as evidence of method, not universal savings benchmarks; tariffs, load factors and roofs differ widely.
How Does Commercial Rooftop Solar Work?
Solar panels generate direct-current electricity, which an inverter converts into alternating current for equipment and machinery.
The business uses available solar electricity first. Additional power is drawn from the grid when demand exceeds generation. Eligible surplus electricity may be exported under applicable net-metering or net-billing rules.
Exported electricity does not always result in a cash payment. It may create bill credits or be settled at an approved rate, depending on the state and DISCOM.
Benefits of Rooftop Solar for Businesses
1. Lower Operating Costs
Generating electricity on-site can reduce the number of units purchased from the grid. Businesses with substantial daytime demand can consume a large share of their solar generation directly.
Actual savings depend on:
- Electricity tariff
- Daytime consumption
- Solar-system capacity
- Available roof area
- System generation
- Financing costs
- Metering regulations
A site-specific financial analysis is required before estimating savings or payback.
2. Protection Against Changing Energy Costs
Grid tariffs and related charges can change over time. Solar allows a business to generate part of its electricity at a more predictable cost.
Solar does not eliminate every utility charge. Fixed charges, demand charges and other fees may continue to apply.
3. Potential Tax Benefits
Eligible businesses that own qualifying solar equipment may be able to claim depreciation under Section 32 of the Income-tax Act. The current depreciation schedule lists solar-power-generating systems under renewable-energy devices at 40%.
Eligibility depends on ownership, commissioning, asset use and current tax rules. Businesses should consult a qualified tax adviser and review the Income Tax Department’s depreciation schedule.
Under an OPEX or PPA arrangement, the third-party system owner may receive the depreciation benefit instead of the electricity consumer.
4. Better Use of Available Roof Space
Factories and warehouses often have large concrete or metal-sheet roofs. These areas can become electricity-generating assets without using additional land.
Before installation, assess:
- Roof strength and condition
- Available shadow-free area
- Structural and wind loads
- Fire-access pathways
- Roof warranties
- Safe maintenance access
Businesses can also compare rooftop and ground-mounted solar systems when open land is available.
5. Progress Towards Sustainability Goals
Solar electricity can reduce dependence on conventional grid power and lower the emissions associated with business operations.
Generation data can support ESG, sustainability and customer reporting. Any emissions-reduction claim should be calculated using actual generation and an appropriate methodology.
CAPEX and OPEX Options
Businesses can install commercial solar through:
CAPEX: The business purchases and owns the system.
Solar loan: The business owns the system while repaying the lender.
OPEX or RESCO: A third party owns and operates the system.
PPA: The business pays an agreed tariff for the solar electricity generated.
Each model has different ownership, maintenance, tax and contract implications. Review the available solar-financing options before deciding.
Does Rooftop Solar Work During Power Cuts?
A standard grid-connected solar system normally shuts down during an outage for safety. It does not automatically provide uninterrupted power.
Businesses requiring backup need a properly engineered hybrid system, battery storage or compatible generator integration.
Is a Government Subsidy Available?
The central PM Surya Ghar subsidy is intended for eligible residential consumers. Standard commercial and industrial connections do not qualify for this residential assistance.
Businesses should separately evaluate depreciation, state incentives, financing and OPEX options.
How Freyr Energy Can Help
Freyr Energy provides commercial and industrial solar solutions based on electricity consumption, available space and site conditions.
Support can include feasibility assessment, shadow analysis, customised design, installation coordination and performance monitoring.
Useful next steps include the commercial solar solutions and the commercial solar case studies. These pages support planning and comparison; final capacity, pricing, approvals and savings remain site-specific.
Minimum Data for a Bankable C&I Study
Collect 12–24 months of bills, half-hourly or 15-minute load data, tariff orders, sanctioned demand, contract demand, power factor, transformer and diesel-generator details, roof drawings, structural information, operating calendar, planned expansions and outage history. Map leased areas and confirm roof rights for the full contract or asset life.
The generation model should disclose weather data, orientation, shading, DC/AC ratio, clipping, temperature, soiling, availability, degradation and curtailment assumptions. Financial results should be reproducible from the stated inputs.
CAPEX and OPEX Contract Questions
For CAPEX, clarify scope, milestones, performance testing, warranties, spares, O&M and liquidated damages. For OPEX or PPA, also review tariff and escalation, minimum offtake, deemed generation, roof access, security, change in law, assignment, insurance, early termination, buyout and end-of-term removal. Obtain legal, tax and accounting advice for the actual structure.
Neither model is automatically better. The choice depends on capital cost, borrowing rate, tax position, counterparty quality, roof tenure and the value placed on operational control.
Relevant Freyr Project Evidence
Freyr Energy reports a 368 kW rooftop project for Sanvira Biosciences in Visakhapatnam producing more than 45,000 units per month, with approximately ₹28 lakh in annual savings and about 14% reduction in grid dependence. It also reports a 650 kW project for Reitz India completed in phases. These are company-reported project outcomes and should be attributed, not generalized.
Their information value is practical: industrial solar must fit operating loads, roof conditions, installation windows and monitoring needs, and it should be commissioned with measurable performance baselines.
Worked C and I Business Case From Interval Data
For a factory, warehouse or office, start with interval demand and tariff bills rather than annual units alone. Plot weekday, weekend and seasonal loads, then overlay hourly solar production. This shows how much generation is likely to be self-consumed, whether export will occur and whether the system changes demand charges under the applicable tariff.
The investment model should separate avoided energy charges, export revenue, O&M, degradation, downtime, insurance, finance, tax assumptions and roof-related work. Run downside cases for lower yield and temporary shutdown. Management should also assess roof tenure, production disruption, lender security and decommissioning before approving CAPEX or a long PPA.
CAPEX, OPEX and Other Commercial Routes
Option or situation | Best use or meaning | What to verify |
CAPEX | Business owns the plant | Capital availability, tax advice, O&M and performance risk |
Loan-funded CAPEX | Business owns; lender funds part | Debt service, security, covenants and total repayment |
PPA or RESCO | Third party usually owns | Tariff, escalation, tenure, minimum offtake and exit |
Lease | Ownership and use depend on contract | Rent, maintenance, buyout and roof access |
Commercial Solar Risks and Controls
Risk or mistake | Why it matters | Control |
Annual average hides shutdowns | Self-consumption is overstated | Use interval and operating-calendar data |
Roof life is shorter than contract | Removal or reroofing cost arises | Align roof and project tenure |
Fire access is consumed | Approval and emergency response suffer | Preserve code-required pathways |
Savings exclude downtime | Business case is too optimistic | Include availability and curtailment cases |
Questions for a Bankable Commercial Solar Proposal
Question | Evidence to request | Why the answer matters |
How much solar will be self-consumed? | Interval load and hourly generation overlay | Determines the main economic value |
What constrains the site? | Structural, fire, roof-life and electrical studies | Defines feasible capacity and construction risk |
Who carries performance risk? | Yield, availability, O&M and remedy clauses | Clarifies ownership and accountability |
How are shutdowns handled? | Method statement and operating calendar | Protects production and customer operations |
What happens at roof or contract end? | Removal, restoration, transfer and termination terms | Prevents long-term property disputes |
Build the Business Case From Interval Data
Commercial savings depend on when the facility consumes electricity, not simply on annual units. Fifteen-minute data reveals the daytime base load, weekend demand, seasonal shutdowns, demand peaks and export risk. The model should simulate normal production, low-utilisation periods and planned expansion.
- Separate energy-charge savings from demand charges, fixed charges, duties and other bill items.
- Use the current state regulation for banking, export settlement and open-access charges.
- Model inverter replacement, degradation, cleaning, insurance and roof-related costs.
- Test a downside case with lower generation and a delayed commissioning date.
Technical Due Diligence for a Bankable Project
The feasibility report should connect the load study, roof or land layout, structural assessment, electrical single-line diagram, evacuation route and energy model. A lender or investment committee should be able to trace every savings assumption to a bill, tariff order, equipment schedule or simulation input.
For an OPEX or PPA project, allocate curtailment, deemed generation, roof repair, insurance, change-in-law, early termination and end-of-term removal or transfer. A lower tariff is not enough if the contract transfers unmanageable operational risk to the consumer.
Sources and Verification Notes
Policy, subsidy, tax, equipment and metering information can change. The primary sources below were checked for this revision; reverify material claims immediately before publication.
- Tax depreciation: Income Tax Department Appendix I — renewable-energy depreciation categories
- Equipment eligibility: MNRE ALMM portal — current approved module and cell lists
- National solar context: PIB India solar growth backgrounder — 2026 solar-capacity and manufacturing context