Solar Project Finance in India: SIDBI, IREDA & Banks

Direct Answer: How to Finance a Solar Project in India

For Indian industrial and MSME buyers, the most cost-effective solar project finance routes in 2026 are SIDBI's 4E and Green Finance (GFS) schemes for MSMEs (up to 100% of project cost under 4E, rating-linked pricing) and IREDA term loans for larger C&I projects (project-specific pricing; IREDA's gross loan yield averaged 9.41% in H1 FY 2026-27). Commercial banks offer solar project funding at roughly 10.5–12.5%, which is more accessible but higher-cost. Combining a DFI loan with the 40% accelerated depreciation benefit creates the optimal capital structure for most industrial solar projects.

TL;DR:

• SIDBI 4E: up to 100% financing, max ₹15 Cr, repayment up to 84 months — best for MSMEs (3+ years in operation)
• SIDBI GFS: up to 75% financing, max ₹100 Cr, open to new and existing MSMEs with Udyam registration
• IREDA: project-specific pricing (portfolio yield 9.41% in H1 FY27), 75-80% LTV — best for MW-scale C&I projects above ₹1 Cr
• PFC/REC: 9–11% indicative, for large industrials 5 MW+ and group captive SPVs
• Commercial banks (SBI, HDFC, Axis): ~10.5–12.5%, fastest processing, highest rate
• Combine 70% DFI debt + 30% equity + 40% AD benefit for optimal solar project finance structure

Key Takeaways

• SIDBI's 4E and Green Finance (GFS) schemes are the most cost-effective solar project funding for MSMEs — 4E finances up to 100% of project cost up to ₹15 Cr; GFS up to 75% up to ₹100 Cr (SIDBI official FAQs, Oct 2026)
• IREDA prices loans project-by-project; its gross yield on loan assets was 9.41% as of 30 September 2026, with a loan book of ₹97,411 Cr (+15% YoY) — best for MW-scale C&I projects
• PFC and REC (PFC holds a 52.63% stake in REC) focus on larger utility and industrial projects, typically ₹10 Cr+ tickets
• Commercial banks (SBI, HDFC, Axis) offer solar term loans at roughly 10.5-12.5%, typically 5-7 year tenure — accessible but higher cost than development finance institutions
• The most important financing consideration: combining a concessional DFI loan (SIDBI/IREDA) with the 40% accelerated depreciation benefit in Year 1 creates the optimal capital structure for most industrial solar projects
• IREDA disbursed ₹10,579 Cr in Q2 FY27 (+31% YoY) and posted a record ₹1,873 Cr annual profit in FY26

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Industrial solar projects in India can be financed through multiple channels, each with distinct interest rates, loan-to-value ratios, eligibility criteria, and processing timelines. The right financing choice depends on the buyer's profile (MSME vs. large corporate), project size, creditworthiness, and urgency. This guide compares the major financing options available to Indian industrial solar buyers in 2026.

Why Solar Project Funding Matters for ROI

Before comparing lenders, understanding how solar project finance affects project economics is critical:

Unlevered (all-equity) 1 MW solar project (assumptions shown so you can swap in your own):

• Capex: ₹2.2 Cr — Sun Wave's reference rooftop rate of ≈ ₹22,000/kW at 500 kW scale, ex-GST, indicative; the final price follows a site survey (1,000 kW × ₹22,000 = ₹2.2 Cr)
• Year 1 savings: ₹1.15-1.30 Cr — assumes ~15 lakh units generated (≈1,500 kWh/kWp) with high self-consumption, avoiding ₹7.5-8.5 per unit of HT energy charge
• Simple payback: ≈ 1.7-1.9 years (₹2.2 Cr ÷ ₹1.15-1.30 Cr), before financing costs and excluding the accelerated-depreciation tax shield
• Savings and payback swing materially with self-consumption share, kVAh-vs-kWh billing and demand charges — model from the factory's actual bill

Levered (70% debt) 1 MW solar project at 9% interest, 7-year tenure:

• Equity outflow: ₹66 lakh (30% of ₹2.2 Cr)
• Debt: ₹1.54 Cr; annual debt service ≈ ₹31 lakh/year (9%, 7-year amortisation)
• Annual savings: ₹1.15-1.30 Cr
• Net cash flow (Year 1-7): ≈ ₹85-100 lakh/year after debt service
• After year 7, the full savings are net free cash flow; equity IRR on a 70%-levered structure sits far above the unlevered return whenever the loan rate is well below the project's unlevered IRR

The key insight: debt financing amplifies equity returns because solar loan rates (roughly 7-11% from DFIs) sit far below the project's unlevered return. The critical condition is that the loan interest rate is significantly below the project's unlevered IRR.

Additionally, the 40% accelerated depreciation benefit reduces taxable income in Year 1 — making a cash-generating profitable business the ideal solar borrower (uses AD to reduce tax, uses loan to amplify equity returns).

Option 1: SIDBI — Best for MSMEs (100 kW – 2 MW)

The Small Industries Development Bank of India (SIDBI) is India's dedicated development finance institution for MSMEs. SIDBI has emerged as the primary green lender for MSME solar projects through two key schemes.

SIDBI 4E Scheme (End to End Energy Efficiency)

Best for: Manufacturing and industrial MSMEs looking to reduce energy costs and carbon footprint

Interest-rate note: SIDBI does not publish a fixed solar loan rate. BEE's ADEETIE listing for SIDBI shows 6.4-7.5% under the 4E scheme (7.6-9.4% under the Green Finance Scheme), while a Mercom lender panel in April 2025 quoted 8.75-10% — actual pricing depends on scheme, internal rating and market conditions, so confirm the applicable rate with SIDBI before modelling.

The most important advantage of SIDBI financing: its concessional, development-mandate pricing typically undercuts commercial bank rates by 200-300 basis points — worth roughly ₹7-10 lakh per ₹1 Cr of loan annually. For a ₹2.2 Cr loan (1 MW at Sun Wave's reference rate), that is ₹17-25 lakh of interest saved over the tenure, before counting the accelerated-depreciation benefit.

Source: SIDBI Green Finance — official FAQs (accessed 1 November 2026); BEE ADEETIE — SIDBI FI details; Mercom India lender panel, April 2025

SIDBI Green Finance Scheme (GFS)

Best for: MSMEs adopting clean/green technologies, including new units

The Green Finance Scheme (GFS, evolved from the earlier MSE-GIFT circular) is SIDBI's umbrella term-loan for eligible green projects. Per SIDBI's current FAQs:

• Covers renewable energy (including rooftop solar), energy-efficient buildings, waste management, resource and energy efficiency, and cleaner production
• Finances up to 75% of project cost, with a maximum loan of ₹100 Cr per MSME (or a service provider/aggregator with an established MSME linkage)
• Open to new and existing MSMEs with valid Udyam registration and a satisfactory credit history — no minimum operating history, unlike 4E
• Flexible repayment tenure set per project

SIDBI Application Process

1. Submit application to SIDBI branch (regional offices in major industrial cities)
2. Provide: 3 years audited financials, projected cash flows with solar savings, project report, EPC quote with ALMM compliance documentation
3. SIDBI's technical team may conduct site visit for projects above ₹1 Cr
4. Typical processing time: 45-90 days
5. Disbursement: against milestones (advance on contract signing, balance on commissioning)

Option 2: IREDA — Best for MW-Scale Industrial Projects

The Indian Renewable Energy Development Agency (IREDA) is a government NBFC (Non-Banking Financial Company) dedicated to financing renewable energy projects. IREDA is India's premier RE lender for projects above ₹1 Cr.

IREDA Solar Loan Features

IREDA's strong 2026 track record: FY 2025-26 was IREDA's best year yet — record net profit of ₹1,873 Cr, loan sanctions of ₹51,883 Cr and a loan book of ₹93,069 Cr (+22%). In Q2 FY27 (quarter ended 30 September 2026), disbursements rose 31% YoY to ₹10,579 Cr and the loan book reached ₹97,411 Cr.

Source: IREDA press release, FY 2025-26 results, 29 May 2026; Business Standard, 19 October 2026 — IREDA Q2 results; IREDA investor presentation, H1 FY27, 19 October 2026

IREDA Application Process

1. Register on IREDA online portal
2. Submit Detailed Project Report (DPR) with technical and financial details
3. Provide: 3 years audited accounts, net worth certificate, project cash flow projections
4. IREDA technical assessment: equipment specifications, EPC contractor evaluation, power purchase arrangements
5. IREDA credit committee approval
6. Disbursement against construction milestones and ALMM compliance verification

Who Should Choose IREDA Over Commercial Banks?

IREDA is preferred for:

• Projects between ₹1-20 Cr (1-5 MW range)
• Buyers with clean credit history (no NPA, no defaults)
• Projects in sectors IREDA prioritizes (manufacturing, cold chain, healthcare)
• Open access solar projects where third-party power purchase validates revenue

Option 3: PFC and REC — For Large Industrial Projects (5 MW+)

Power Finance Corporation (PFC) and REC Limited are two of India's largest public sector energy financiers; PFC holds a 52.63% majority stake in REC, so the two function increasingly as a coordinated pair for large-scale energy financing.

PFC/REC Financing Features

Key consideration: PFC and REC are most suitable for large corporates (turnover above ₹100 Cr) with complex project structures — group captive SPVs, open access projects with multiple consumers, or large (5-50 MW+) captive industrial projects. Their processing requires detailed financial analysis and may take 3-6 months.

Option 4: Commercial Banks — Most Accessible but Highest Rate

Major commercial banks offer solar project loans as part of their SME or project finance portfolios. Banks are more accessible (wider branch network, faster decisions for small loans) but carry higher rates.

Key Commercial Bank Solar Loan Comparison (2026)

When to choose commercial banks:

• Existing banking relationship with favorable terms
• Faster processing needed (30-45 days vs 45-90 days for SIDBI/IREDA)
• Project size below ₹25 lakh (minimum SIDBI ticket)
• Industrial buyer with strong collateral and credit rating that qualifies for sub-base-rate pricing

Option 5: Green NBFCs and Fintech Solar Lenders

Several specialty NBFCs and fintech platforms offer solar-specific financing, especially for smaller rooftop projects:

• TATA Capital: solar loan products with flexible structures
• Tata Power's MSME financing platform (via SIDBI MoU): bundled financing + EPC for Tata Power customers
• Mufin Green Finance: MSME solar lender
• Amplus Energy Solutions: RESCO financing partner for industrial C&I

These channels are faster but often carry higher effective rates (11-15%). They are best for sub-₹50 lakh projects or buyers who need combined EPC + financing from a single provider.

Choosing the Right Solar Project Finance Option: Decision Framework

For MSME Manufacturers (Turnover under ₹50 Cr)

The most cost-effective path: SIDBI 4E (up to 100% financing, up to ₹15 Cr) or the GFS for newer units. Apply online through SIDBI's portal or at a branch.

For Mid-Size Industrial Buyers (₹50-500 Cr Turnover)

Recommended: IREDA → project-specific DFI pricing, 75-80% LTV. Apply directly to IREDA. Processing takes 45-90 days but delivers development-finance rates for C&I solar above ₹1 Cr.

For Large Corporates (₹500 Cr+ Turnover)

Recommended: IREDA or PFC/REC for large projects (5 MW+); Commercial bank consortium for projects requiring speed. For group captive SPVs with multiple industrial shareholders, IREDA or PFC with project-level financing.

For Urgency (Need Loan in 30 Days)

Recommended: Commercial bank with existing relationship → faster processing, higher rate. Accept 10.5-11.5% rate in exchange for 30-45 day decision vs 90-day SIDBI/IREDA.

Combining Solar Project Finance with Accelerated Depreciation

The most financially optimal capital structure for industrial solar in India:

1. Debt financing: 70% of capex from SIDBI/IREDA at concessional DFI pricing
2. Equity: 30% of capex (₹66 lakh per MW at Sun Wave's ₹2.2 Cr reference) from own funds
3. Year 1: Claim 40% accelerated depreciation on the full capex (not just equity) → at a 30% corporate tax rate, a ₹2.2 Cr capex saves about ₹26 lakh in Year 1 taxes (40% × ₹2.2 Cr × 30%)
4. Years 1-7: Service debt from solar savings (≈ ₹31 lakh/year for a 70%-levered 1 MW project at 9%)
5. Year 7+: Post-debt-service, all solar savings are net free cash flow

The Year-1 arithmetic for a profitable industrial buyer: ₹66 lakh equity outflow minus the ≈ ₹26 lakh AD tax saving ≈ ₹40 lakh effective Day-1 exposure per MW — with debt service covered by the savings stream.

See our solar financing bank loan guide and solar accelerated depreciation guide for detailed calculations.

RESCO/OPEX: Zero-Investment Alternative

If financing is unavailable or the buyer prefers zero capex, RESCO/OPEX solar allows installation with no upfront investment:

• Developer finances, owns, and maintains the plant
• Buyer pays per unit consumed at indicative rooftop PPA rates of ₹3.5-5.5/kWh (vs industrial grid tariffs of ₹7.5-12.0/kWh) — see our solar PPA rates guide
• Immediate savings from Day 1, zero equity required
• 15-25 year contract; buy-out option from Year 7

The tradeoff: RESCO delivers lower total value than CAPEX over 25 years (developer captures residual value and tax benefits), but it is the right choice for buyers with capital constraints or leased premises.

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Frequently Asked Questions

What is the best solar loan rate available in India in 2026?

The most cost-effective solar project finance for MSMEs is SIDBI's 4E scheme — up to 100% financing with rating-linked pricing that recent official and industry listings put between roughly 6.4% and 10%. For larger C&I projects above ₹1 Cr, IREDA lends at project-specific rates (its gross portfolio yield was 9.41% in H1 FY 2026-27). Commercial banks charge roughly 10.5-12.5% but process faster.

Can I get 100% solar project funding with no equity?

SIDBI's 4E scheme can finance up to 100% of project cost for eligible MSMEs (units in operation for at least 3 years with cash profits in the last 3 FYs, loans up to ₹15 Cr). Most other lenders — IREDA, banks, PFC/REC — require 20-30% equity. If you cannot commit equity, RESCO/OPEX solar with zero investment is the alternative.

How does an IREDA solar loan compare to a bank loan?

DFI loans such as IREDA's typically price 150-300 basis points below commercial bank term loans and offer longer tenures with a construction-period moratorium. The tradeoff is longer processing (45-90 days versus 30-45 for banks) and a ₹1 Cr practical minimum. IREDA disbursed ₹10,579 Cr in Q2 FY27, up 31% year on year, so C&I appetite for this channel is growing.

What documents are required for an IREDA solar loan application?

Key documents: 3 years audited financials, Memorandum and Articles of Association, board resolution, projected cash flows with solar savings, Detailed Project Report (DPR), EPC contract or quotation with ALMM compliance documentation, land or roof ownership documents, and DISCOM net metering approval letter (if already obtained).

How does the accelerated depreciation benefit interact with debt financing?

The AD benefit is claimed on the full capex (debt + equity). At a 40% AD rate and a 30% corporate tax rate, a 1 MW project at ₹2.2 Cr capex saves about ₹26 lakh in Year 1 taxes — cutting the effective Day-1 equity exposure to roughly ₹40 lakh on a 70%-levered structure.

What is the SIDBI loan for solar projects — eligibility and interest rate?

SIDBI's 4E scheme offers solar project funding covering up to 100% of project cost (maximum ₹15 Cr, repayment up to 84 months) for MSME units in operation for at least 3 years with cash profits in the last 3 FYs. Interest rates are rating- and scheme-linked — recent listings range from about 6.4-7.5% (BEE's ADEETIE listing) to 8.75-10% quoted at a 2025 Mercom lender panel — so confirm the applicable rate with SIDBI.

What is SIDBI's solar loan scheme for newer or smaller factories?

SIDBI's Green Finance Scheme (GFS) is the broader route: it funds renewable energy and clean-technology projects at up to 75% of project cost, with loans up to ₹100 Cr, and — unlike 4E — is open to new as well as existing MSMEs holding a valid Udyam registration with a satisfactory credit history.

Can the solar plant be used as collateral for the loan?

Yes, for larger projects (IREDA, PFC). The solar plant's future cash flows (net metering savings or open access PPA revenue) can be assigned as loan security. For smaller projects (SIDBI 4E, bank loans), existing plant and machinery or property is the typical collateral.

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Sun Wave Technologies provides solar EPC design and financing advisory for industrial buyers across Delhi-NCR, Haryana, UP, Rajasthan, Gujarat, and Maharashtra. Our team assists clients with SIDBI, IREDA, and commercial bank applications as part of the project development process.

Sources

• SIDBI Green Finance — official FAQs (accessed 1 November 2026)
• BEE ADEETIE — SIDBI financing-institution details
• IREDA press release — FY 2025-26 results, 29 May 2026
• Business Standard — IREDA Q2 FY27 results, 19 October 2026
• IREDA investor presentation — quarter and half year ended 30.09.2026, 19 October 2026
• Mercom India — solar financing options for MSMEs, lender panel, April 2025

Last verified: 1 November 2026