Solar Financing & Bank Loans in India: Factory Guide

Key Takeaways

• Solar qualifies as priority sector lending under RBI guidelines, giving factories access to bank loans at 8–10% interest with 7–10 year tenures.
• The most important financial insight: at 9% interest, your solar EMI roughly equals your electricity savings, making the investment cash-flow neutral from day one.
• Four financing models are available: self-funded CAPEX, bank loan, RESCO/PPA (zero investment), and lease financing — each suited to different financial situations.
• With accelerated depreciation (40% in year 1), the effective cost of financed solar drops by 25–30%, making the loan payback even faster.
• Sun Wave Technologies partners with SBI, PNB, and other banks to offer turnkey solar EPC with integrated financing solutions.

Solar Financing Options Compared

The Four Paths to Industrial Solar

Decision Framework

The best financing model depends on three factors:

1. Available capital: If you have ₹3.5–5 Cr per MW available, self-funded CAPEX delivers the best returns
2. Tax position: If your company has significant taxable profits, accelerated depreciation on owned systems provides substantial tax benefits
3. Balance sheet preference: If you want to keep solar off-balance sheet, RESCO or lease is better

The bottom line: every financing model saves money compared to grid electricity. The key difference is how much you save and when.

Bank Loans for Solar: Detailed Guide

Priority Sector Lending Advantage

The Reserve Bank of India classifies renewable energy under priority sector lending. This means:

• Banks must allocate a portion of lending to renewable energy projects
• Lower interest rates: 8–10% vs. 10–14% for regular term loans
• Faster processing: Priority sector applications are processed faster
• Higher approval rates: Banks have targets to meet, incentivizing approvals
• Longer tenures: Up to 10 years (some banks offer 12–15 years)

Leading Banks for Solar Financing

Loan Structure for a 1 MW Solar Project

Project cost: ₹4.0 Crore

This means the solar system generates ₹89–95 lakhs more than the EMI in year 1 itself. The loan is cash-flow positive from day one, and after the loan is repaid, savings flow entirely to your bottom line.

Documents Required for Solar Loan

Loan Application Process

1. Get a DPR from your EPC contractor: Sun Wave Technologies provides bank-ready DPRs with detailed financial projections, equipment specifications, and generation estimates
2. Approach 2–3 banks: Compare interest rates, processing fees, and tenure options
3. Submit application: With all documents and the DPR
4. Bank evaluation: Site visit, financial analysis, project viability assessment (2–4 weeks)
5. Sanction letter: Bank issues loan terms and conditions
6. Disbursement: Typically in stages — 30% at order placement, 40% at material delivery, 30% at commissioning
7. Repayment begins: EMI starts from the month after full disbursement

Cash Purchase: Maximum Returns Analysis

For companies with available capital, self-funded CAPEX delivers the best returns:

Why Cash Purchase Wins

The key advantage of cash purchase: no interest expense means ₹5+ Crore more in total savings over 25 years compared to bank financing.

Opportunity Cost Consideration

Compare solar IRR against alternative investments for your ₹4 Crore:

Solar offers the best risk-adjusted return. The most common reason companies don't self-fund is not the return profile but capital allocation priorities — which is perfectly valid and where bank loans or RESCO fill the gap.

Lease Financing for Solar

How Solar Leasing Works

A leasing company purchases the solar system and leases it to you:

1. Leasing company funds the EPC cost
2. You pay monthly lease rentals for 7–10 years
3. At the end of the lease, ownership transfers to you at a nominal residual value
4. The lease rental is an operating expense (OPEX), not a capital expenditure

Advantages of Leasing

• Off-balance sheet: The solar asset doesn't appear on your balance sheet (under certain accounting standards)
• 100% financing: No equity margin required
• OPEX treatment: Lease rentals are fully deductible operating expenses
• Lower total cost than RESCO: Lease rentals are typically ₹4–6/kWh equivalent, lower than PPA rates of ₹3.5–5.5/kWh (because you eventually own the system)

Lease vs. Loan vs. RESCO

How to Choose the Right Financing Model

Use Self-Funded CAPEX When:

• You have surplus cash earning less than 15% return
• Your company has significant taxable profits (to claim AD benefit)
• You want maximum control over equipment choices
• You want the highest 25-year savings (₹15–25 Cr per MW)

Use Bank Loan When:

• You want ownership but prefer to preserve working capital
• Your company qualifies for priority sector lending rates (8–10%)
• You have taxable profits to benefit from accelerated depreciation
• You want a structured EMI that's predictable and cash-flow positive

Use RESCO/PPA When:

• Zero upfront investment is a hard requirement
• Your company doesn't have significant taxable profits (AD not valuable)
• You want zero maintenance responsibility
• The factory is on leased premises (some developers accept this)
• Quick decision-making is needed (RESCO involves less internal approvals)

Use Lease When:

• Off-balance sheet treatment is important for your company's financial ratios
• You want 100% financing without equity margin
• OPEX treatment is preferred for tax purposes
• You eventually want system ownership (unlike RESCO)

Savings Calculator with Different Financing Models

Example: 500 kW Factory in Haryana

Frequently Asked Questions

What interest rate can I get for a solar loan in India?

Solar loans qualify as priority sector lending under RBI guidelines, with interest rates of 8–10% from major public sector banks (SBI, PNB, Bank of Baroda). Private banks and NBFCs offer rates of 10–12%. IREDA (Indian Renewable Energy Development Agency) provides specialized solar financing at 9.5–11%. The best rates are available to companies with strong financials, collateral, and an EPC contractor with a proven track record.

Is a solar loan cash-flow positive from day one?

Yes, in most cases. For a 1 MW system in Haryana or Delhi-NCR, the annual electricity savings (₹1.2–1.5 Crore) significantly exceed the annual EMI (₹42–50 lakhs for a 10-year loan at 9%). This means you have ₹70–100 lakhs per year in positive cash flow even while repaying the loan. After the loan is repaid, the full savings flow to your bottom line.

Can I get 100% financing for an industrial solar project?

Standard bank loans cover 70–80% of the project cost, requiring 20–30% equity from you. For 100% financing, consider: (1) RESCO/PPA — zero investment, developer funds everything; (2) Lease financing — some leasing companies offer 100% coverage; (3) IREDA loans — may cover up to 85% for strong projects. Sun Wave Technologies helps structure financing packages that minimize your upfront capital requirement.

How does accelerated depreciation work with a solar loan?

Even when you finance solar through a bank loan, you (as the owner) can claim accelerated depreciation. For a ₹4 Crore project: Year 1 depreciation of ₹1.6 Crore (40%) generates tax savings of ₹40 lakhs (at 25% tax rate). This tax refund can be used to prepay a portion of the loan, reducing total interest cost and accelerating payback. The combination of loan financing + AD makes solar one of the most tax-efficient industrial investments.

Which is better for a small factory: solar loan or RESCO?

For small factories (under 200 kW), RESCO is often more practical because: (1) Small loan amounts attract higher processing fees relative to the project; (2) The administrative burden of loan documentation may not be worth it; (3) RESCO developers handle everything including O&M. However, if your factory has stable profits and you qualify for a competitive loan rate (below 10%), a bank loan delivers 2x higher long-term savings.

How long does it take to get a solar bank loan approved?

Solar loan approval typically takes 4–8 weeks from application to disbursement. The timeline includes: document submission (1 week), bank evaluation and site visit (2–3 weeks), sanction (1 week), and disbursement processing (1–2 weeks). Having a complete DPR (Detailed Project Report) from your EPC contractor significantly speeds up the process. Sun Wave Technologies provides bank-ready DPRs that meet all major banks' documentation requirements.