How to Finance Your Solar Installation: The Complete Guide for Indian Consumers

What Does Solar Actually Cost? (CAPEX Overview)

Before you think about financing, you need to know what you're financing. Solar installation costs have a few distinct components and knowing them stops vendors from hiding charges in vague line items.

A typical on-grid residential systems in a tier 1 Indian city (3KW, sufficient for a home of ₹3,000–₹5,000 monthly electricity bill ) costs ₹1.8 lakhs to ₹2.2lakhs before subsidy. A 5kW system costs roughly ₹2.8 lakhs to 3.5 lakhs. Commercial systems (50 - 100kW) scale to ₹25 - ₹50 lakh and above.

What goes into that number

For a deep dive into system sizing, and cost comparisons, check out our dedicated Solar Installation Cost Guide.

Government Subsidies and Incentives

India's subsidy structure for rooftop solar is meaningful - but most people either don't know how it works or have quite a few misconception or misunderstanding on how it operates, eligibility or application process

PM Surya Ghar Muft Bijli Yojana - The Central Government Solar Subsidy

This is the flagship scheme for residential rooftop solar. It's a direct capital subsidy - not a loan, not a tax deduction - deposited straight into your bank account after commissioning.

For housing societies, the subsidy is structured differently: ₹18,000 per kW for common-area systems up to 500 kW, capped at ₹90 lakh.

Important: The subsidy is only available if you own the system. If you go the RESCO/OPEX route (where a third-party owns the panels), you forfeit the subsidy entirely. This changes the long-term maths significantly.

Key considerations for Central Subsidy Qualification

To qualify, your panels must be DCR(Domestic Content Requirement) models - cells and panel manufactured in India. Many cheaper import based quotes don't qualify. The application is made through the PM Surya Ghar National Portal; your DISCOM must approve the connection and install a bi-directional meter before disbursement happens. Subsidy typically lands inn your account 30-90 days after comissioning.

State level Subsidies

Some states add their own incentives on top of the central subsidy. A dedicated blog on state-wise subsidies is the right place for full detail, but here's a quick snapshot of states that currently offer additional support:

Subsidies are revised periodically. Always verify your state's current scheme on PM Surya Ghar Portal or your DISCOM's website before signing any vendor contract

Tax Benifits on Solar in India - What you can actually Claim

This is where there's the most confusion online. Many articles cite solar tax deductions that either don't exist for individuals, expired years ago, or were designed exclusively for businesses. Here is a clear, accurate split:

For Salaried Homeowners: What Doesn't Exist(and what Does)

There si no standalone income tax deduction in the Income Tax Act, 1961 that reduces your taxable income simply because you installed rooftop solar. No specific section, no solar rebate, no energy credit - this doesn't exist for Indian tax code

The PM Surya Ghar subsidy (up to ₹78,000) is completely tax-free. You do not need to declare it as income in your ITR. It is treated as a government capital subsidy, not earnings.

The on narrow exception: If solar is bundled into a home construction load - meaning the cost of the solar system was included in your overall home load- then the loan interest qualifies for deduction under section 24(b)(upto ₹2 lakh/year for self-occupied property under the old tax regime) and principal repayment qualifies under section 80C. This is not a solar deduction. It's a home loan deduction that happens to include your solar cost. A standalone solar loan does not qualify.

Section 80EE and 80EEA - Do they Apply

No. Both sections were designed for first- time homebuyers purchasing property, not for installing equipment. Their eligibility windows are also closed - Section 80EE covered loans sanctioned only between April 2016 and March 2017; Section 80EEA covered affordable housing loans between April 2019 and March 2022. If you have an existing loan from those windows, you can continue claiming - but neither section can be applied to solar loan.

For Businesses and MSMEs: Accelerated Depreciation(The Real Benefit)

This is where the tax benefit is genuinely powerful. Under Section 32 of the Income Tax Act, businesses can claim upto 40% accelerated depreciation on the solar asset's value in year 1. This directly reduces your taxable business income.

Depreciation continues in subsequent years at normal rates. For businesses in higher tax brackets, this is one of the strongest tax-efficiency plays available on a capital asset in India.

GST on Solar Equipment

Residential solar installations attract an effective GST of approximately 8.9% - significantly lower than 12 - 18% applied to most household electronics. For commercial buyers who are GST-registered, the GST paid on solar equipment purchase can often be claimed as Input Tax Credit(ITC), further reducing the effective cost of the system.

Net Metering and Tax

For most residential consumers, net metering reduces your electricity bill rather than generating income — which means there's no taxable event. Surplus units are adjusted against your monthly consumption. A small number of states (like Delhi and Chandigarh) allow a cash payout for residual annual export credits, but the amounts for residential users are typically minimal. If you receive a cash payout, confirm treatment with your CA — bill adjustment credits are not taxable.

Old vs New Tax Regime

The home loan deductions under Section 24(b) and 80C are available only under the old tax regime. Under the new tax regime (now the default for individuals), these deductions cannot be claimed. This effectively makes the tax angle on home-loan-bundled solar irrelevant for most new-regime filers. The PM Surya Ghar subsidy remains tax-free regardless of which regime you choose.

Financing Options Side by Side

How you pay for solar has as much impact on your total return as what system you buy. The four main routes in India each suit a different cash flow situation and ownership preference.

Solar Loans : PSU Banks vs NBFCs

Most homeowners will finance through a loan. The real choice is between PSU banks(lowest interest rates, more friction) and NBFCs(Faster, digital, higher rates but full subsidy stays with you).

PSU bank catch: All PSU bank solar loans require you to have a savings account with that bank and to register on the Jan Samarth portal. The process involves physical branch visits and a site inspection. Approval typically takes 3–6 weeks. If you need speed, NBFCs approve within 24 hours — digitally, with just PAN + Aadhaar + electricity bill.

RESCO/OPEX - What you're Actually Signing-up For

Under the RESCO model, a developer installs panels on your roof at their cost and sells you the power a a rate below your current grid tariff. You pay only for units consumed. The developer handles all maintainance. At the end of the Power Purchase Agreement (PPA) - typically 10-25 years - ownership usually transfers to you, but terms vary significantly by contract.

The trade-off: you pay less upfront but earn significantly less over 25 years, because the developer keeps the margin and you cannot claim the PM Surya Ghar Subsidy.

Real Numbers : CAPEX Loan vs RESCO on a 100KW commercial Plant

Bottom line: If your business or household can arrange 10–20% down, a solar loan with CAPEX ownership will almost always deliver significantly better long-term returns than RESCO. RESCO makes sense when capital is genuinely unavailable or when the business doesn't want any operational responsibility for the asset

IREDA & MNRE-Backed Financing Schemes

The Indian Renewable Energy Development Agency (IREDA) provides project financing for larger commercial and industrial solar installations — typically 500 kW and above. Interest rates are competitive (around 9–11%) and tenures can extend to 15 years. For MSMEs looking at rooftop systems in the 50–500 kW range, IREDA can be approached directly or through tie-up with your solar EPC vendor.

How the Subsidy Works with a Loan

1. Take a solar loan from a PSU Bank or NBFC to fund the full installation cost.

2. System gets installed commissioned by your DISCOM.

3. Register on the PM Surya Ghar Portal and complete your subsidy application.

4. Subsidy (up to ₹78,000) is deposited in your bank account within 30-90 days of commissioning.

5. Use the subsidy amount to make a lump-sum principal prepayment on your loan - reducing your remaining EMI burden substantially.

ROI and Payback Period

The payback period is the single number most consumers ask about first and it's also the most frequent miscalculated one. Here's how to think about it correctly.

How Payback Period Is Calculated

Payback period = Net system cost ÷ Annual electricity savings

For a ₹2 lakh system with ₹78,000 subsidy, your net cost is ₹1.22 lakh. If your system saves ₹30,000 - ₹40,000 per year on your electricity bill, you're looking a payback of 3 - 4 years. For a 25 - year system life, that's 21 - 22 years of essentially free electricity after payback.

What Accelerates Payback?

Electricity tariffs in India risen at approximately 5-8% per year historically. Because your solar system locks in production cost at near-zero, every tariff hike makes your system more valuable. A system with a 4-year payback today could effectively be a 3- year payback on paper in Year 5 because of tariff escalation.

25-Year Financial Projection(3kW Residential System)

IRR(Internal Rate of Return) - Simplified

IRR is the annual return your solar investment earns, comparable to a fixed deposit or mutual fund. A residential solar system in India typically delivers an IRR of 18–26% — significantly higher than a 7% FD or market average equity returns over the same period. For commercial systems with accelerated depreciation factored in, IRR can touch 30%+.

Net Metering and Your Bill

With net metering, units your system generates that you don't consume in real time are exported to the grid. Your DISCOM credits these against future consumption. You only pay for "net units" — what you drew from the grid minus what you fed in. Settlement periods vary by state (monthly or annual). Surplus credits at year-end are either carried forward or, in some states, paid out in cash at the Average Power Purchase Cost (APPC). For residential users, designing your system to match your consumption (not to over-generate) gives the best financial outcome.

Ongoing Costs(OPEX) - The Numbers Nobody Talks About

Most payback calculations show you the savings but ignore the ongoing costs. These are real and should be in your financial model before you sign anyting

Annual Maintenance Cost

A well-installed rooftop system requires minimal maintenance. Annual costs for a 3-10kW system typically run ₹3,000–₹8,000/year, ₹3,000–₹8,000/year covering cleaning (especially in dusty cities) and periodic electrical checkups. Vendors offer Annual Maintenance Contracts(AMCs).

Inverter Replacement

This is the most commonly missed cost. Solar panels last 25 years with gradual degradation. Inverters typically last 10-12 years. Budget for one inverter replacement around Year 10-12 for a 3kW system, that's ₹20,000–₹35,000. For a 100 kW commercial system, budget ₹1.5–₹2.5 lakh.

Panel Degradation

Quality solar panels lose approximately 0.5-0.7% output per year. This means a panel generating 100 units in Year 1 generates 86-88 units by Year 25. Reputable manufactures guarantee 80% output in 25 years. Build this into your savings estimate - a 0.6% annual degradation reduces total generation by 14% over the system's life,

Commercial vs Residential - How the Financials Differ

The financial case for going solar is strong for both segments, but the levers are very different.

For MSMEs: The Depreciation + Savings Double Benefit

A business in the 30% tax bracket investing ₹44 lakh in a 100kW solar plant gets approximately ₹5.28 lakh in tax savings in Year 1 alone from depreciation - before counting a single unit of electricity generated. Combined with ₹15 lakh in annual electricity savings, the first year effective return can exceed 45% of the investment. This is one of the most tax efficient capital expenditures available to Indian businesses today.

MSME Specific Financing Schemes

MSMEs can access IREDA's direct lending at competitive rates for systems above 500kW. For smaller commercial systems(10 - 500kW), nationalized banks like SBI, Canara and Bank of Baroda offer commercial solar loans and NBFC players like Ecofy and CreditFair provide faster digital options. SIDBI (Small Industries Development Bank of India) also has green energy financing windows for qualifying MSMEs.

Common Financial Mistakes to Avoid

These mistakes cost people real money. Most are avoidable with 15 minutes of due diligence.

1. Choosing the lowest quote without checking ROI

A cheaper system with lower-quality panels and no generation guarantee can save you ₹20,000 upfront and cost you ₹2–3 lakh in lost savings over 10 years due to under-performance. Always evaluate total lifetime savings, not just sticker price.

2.Missing the subsidy application deadline or process

This PM Surya Ghar subsidy must be applied through the official portal before or alongside your installation - not after. Vendors who say "we'll handle the subsidy" without showing you the portal registration confirmation are a red flag.

3. Signing a RESCO PPA without reading escalation clauses

Many RESCO contracts include a 3-5% annual tariff escalation on the solar rate you pay. Over a 20 year PPA, that can significantly erode your savings advantage over the grid tariffs. Read the escalation clause carefully before signing.

4. Over-sizing the system beyond what net metering allows

Generating far more electricity than you consume doesn't mean you earn more. Many DISCOMs credit surplus units at a low administrative rate - sometimes as low as ₹2–3/unit versus the ₹8–12/unit you'd save by offsetting consumption. Size to your consumption, not aspirationally.