Solar Finance Options India 2026: Loan vs Lease vs RESCO

TL;DR — Solar Finance Options for Indian Industrial Buyers

• The bottom line: the right finance structure for your solar project depends on three variables: tax position, capital availability, and risk appetite. The answer for tax-paying corporates with capital is bank term loan + 40% accelerated depreciation (best 25-year IRR). The answer for capital-constrained or asset-light operators is RESCO/OPEX (zero capex, immediate savings).
• The most important finance options for Indian industrial solar in 2026: (1) Bank term loan (75-80% LTV at 8.75-9.75% pa), (2) Equipment lease (operating or finance lease), (3) RESCO/OPEX (developer owns asset, you pay per kWh), (4) PMEGP/Mudra-linked (for SMEs up to ₹50 lakh), (5) PSU-anchored solar bonds (large-MW projects), (6) Working capital + AD self-funding (for cash-rich corporates).
• The key economic point: bank term loan is the cheapest capital (8.75-9.75% pa) but requires balance-sheet capacity. RESCO is most accessible (no capex) but most expensive (developer captures 14-18% IRR through PPA tariff).
• In short, the most cost-efficient structure for a typical mid-sized Indian factory is bank term loan with 40% AD claim in Year 1, capturing ₹35-40 lakh per MW of tax savings while leveraging cheap bank capital.
• Sun Wave Technologies, a leading solar EPC company in India, structures bank financing arrangements with SBI, HDFC, ICICI, Axis, Yes Bank, Bandhan, IndusInd, and Tata Capital, plus RESCO with our developer partners.

The Six Main Finance Options

1. Bank Term Loan

You take a term loan (typically 75-80% LTV) from a Tier-1 Indian bank to fund the solar project.

• Tenor: 5-10 years
• Interest rate (2026): 8.75-9.75% pa
• Security: Project asset hypothecation + 10-15% margin money
• Repayment: monthly EMI + balloon at maturity (sometimes)
• Tax treatment: Interest deductible; 40% accelerated depreciation Year 1 captured by you

2. Equipment Lease (Operating or Finance)

Lease structure where the lessor owns the asset and you pay periodic lease rentals.

• Operating lease: lessor retains depreciation; you book rent as OPEX (off-balance-sheet)
• Finance lease: you book asset on balance sheet (similar to loan); 40% AD captured by you
• Tenor: 5-15 years
• Effective cost: 11-13% pa (operating), 9.5-10.5% pa (finance)
• Use case: corporates with debt-cap constraints (operating lease); CFOs preferring on-balance asset (finance lease)

3. RESCO/OPEX

A developer (Sun Wave or partner) builds and owns the solar plant; you pay per kWh consumed via 25-year PPA. See our CAPEX vs OPEX vs Open Access comparison and RESCO/OPEX guide.

• Tenor: 15-25 years
• PPA tariff: ₹4.50-5.50/kWh (vs grid ₹7-9/kWh)
• Capex: zero from your side
• Tax treatment: 40% AD captured by developer; you book PPA charge as OPEX
• Best for: capital-constrained, asset-light, REIT-held facilities

4. PMEGP / Mudra / CGTMSE-linked

Government schemes for new MSME manufacturing or services units up to ₹50 lakh.

• PMEGP: 15-35% capex grant + balance via bank loan
• Mudra: collateral-free up to ₹10 lakh
• CGTMSE: collateral guarantee for SME term loans up to ₹2 Cr
• Use case: new MSME manufacturing units integrating solar from day one

5. PSU-Anchored Solar Bonds

For very large solar projects (50+ MW), PSU companies (NTPC, NHPC, IOCL, GAIL) sometimes issue solar-anchored bonds at coupon rates of 7.5-8.5% pa. Captive industrial buyers can co-invest as anchor offtakers, securing both supply and financing.

6. Working Capital + AD Self-Funding

For cash-rich corporates, fund solar capex from internal accruals + recover via 40% Year-1 AD tax savings. Effective net capex outflow: ~₹2.95-3.30 Cr per MW after AD recovery (vs ₹3.50 Cr nominal).

Side-by-Side Finance Comparison Table

For a 1 MW solar plant at ₹3.50 Cr capex, Indian C&I corporate at 25.17% effective tax rate, grid alternative ₹8.00/kWh:

The result: PMEGP+bank wins on absolute IRR for eligible MSMEs. Bank term loan + AD wins for typical tax-paying corporates. RESCO wins for capital-constrained operators.

Tax Optimisation: 40% Accelerated Depreciation

Under Section 32(1)(iia) of the Income Tax Act, solar assets qualify for 40% accelerated depreciation in Year 1 (vs. typical 15% for regular plant and machinery). For a 1 MW solar at ₹3.50 Cr capex:

• Year 1 depreciation: ₹3.50 Cr × 40% = ₹1.40 Cr
• Year 2 onwards: 20% of remaining WDV per year
• Total Year 1 tax saving (at 25.17% effective rate): ₹35.2 lakh

This is the most important tax optimisation for Indian industrial solar. To capture the benefit:

• The asset must be commissioned before March 31 of the financial year
• The asset must be used in business (not personal use or rental for residential purpose)
• The corporate must have sufficient profit to absorb the depreciation (otherwise it carries forward as tax loss)

For full AD details, see our solar accelerated depreciation guide.

Bank-Specific Solar Term Loan Terms (FY 2026-27)

For Madhya Pradesh's interest subvention scheme see our MP industrial guide.

When to Use Each Finance Option

Bank Term Loan: Default for Most Tax-Paying Corporates

The answer for ~70% of Indian C&I solar projects is bank term loan with 40% AD claim. Bank rates of 8.75-9.75% pa are below the project's 24-28% IRR — leveraged returns on equity are 35-50%. Captures full AD tax benefit.

Operating Lease: For Off-Balance-Sheet Preference

CFOs preferring to keep solar capex off-balance-sheet (covenant compliance, investor metrics) use operating lease. Trades 1-2 percentage points of IRR for the off-balance treatment.

Finance Lease: Capital-Constrained But Tax-Capacity-Available

Same balance-sheet treatment as loan; same AD capture. Used when bank credit lines are constrained but lessors are willing to underwrite the project.

RESCO/OPEX: Asset-Light or Multi-Site

For REIT-held real estate, asset-light operating models, multi-site portfolios where standardisation matters, or non-tax-paying operators (educational institutions, religious bodies). See our RESCO/OPEX guide.

PMEGP / Mudra: New MSME up to ₹50 lakh

For new MSME manufacturing or services units integrating solar from day one. Combine with cluster RESCO for projects above ₹50 lakh.

PSU-Anchored Bonds: Very Large 50+ MW Projects

For utility-scale captive projects, PSU bond co-issuance can secure 7.5-8.5% pa coupon — better than commercial bank rates. Used by cement, steel, refinery majors with strong credit.

Working Capital + AD Self-Funding: Cash-Rich, Speed-Sensitive

For corporates wanting to commission rapidly without bank-loan documentation delays (typical 6-12 weeks). Fund from internal accruals; recover ₹35-40 lakh per MW via Year-1 AD.

State-Level Subsidies and Grants (Stack with Finance)

In addition to bank finance, claim state-level capex grants:

• Punjab 5% SME cluster grant
• WB 10% SME grant up to 500 kW
• Kerala 10% solar+BESS hybrid grant
• Goa 10% tourism property grant
• Telangana 20% BESS subsidy
• MP 5% bank loan interest subvention
• HP 10% SME grant up to 500 kW
• Bihar 5% SME grant up to 500 kW
• Odisha & Jharkhand 5% mining-linked grant

See our SME factories guide and how-to-choose-EPC guide for application process.

Frequently Asked Questions

What's the cheapest solar finance option in 2026?

For tax-paying corporates with bank credit access, the cheapest is bank term loan at 8.75-9.75% pa with 40% accelerated depreciation tax capture. For new MSMEs up to ₹50 lakh, PMEGP+bank with 15-35% capex grant beats stand-alone bank loan. For non-tax-paying operators (educational institutions, religious bodies, REITs), RESCO/OPEX is the lowest effective cost despite the tariff premium because they cannot capture AD anyway.

What's the typical interest rate on a solar term loan in 2026?

In 2026, Indian banks lend solar term loans at 8.75-9.75% pa for industrial CAPEX projects with strong borrowers. Tata Capital and Yes Bank are at the higher end (9.50-10.50%). PSU banks (SBI, BoB, PNB) are at the lower end (8.75-9.25%). MP-specific 5% interest subvention reduces effective rate to 4.5% pa for plants above 1 MW for the first 5 years.

Should I use my own cash or take a bank loan for solar?

The answer depends on your cost of capital. If your weighted average cost of capital (WACC) is below 9.5%, self-funding is cheaper than bank borrowing. If WACC is above 9.5%, borrowing is cheaper. For most mid-sized Indian corporates with WACC of 11-13%, bank term loan is the right choice. The bank rate of 9.25% is below the project's 24-28% IRR, providing leveraged returns on equity of 35-50%.

Is operating lease tax-friendly for solar?

Operating lease has trade-offs: pros are off-balance-sheet treatment (better for covenant ratios), simple cost structure (rent is fully deductible OPEX), no capex commitment. Cons are higher effective cost (11-13% pa vs 9-10% for loan), no AD capture, longer commitment (typical 10-15 years). For tax-paying corporates with bank credit access, term loan beats operating lease. For asset-light or covenant-constrained operators, operating lease can be the right answer.

Can I combine bank loan with state-level capex grant?

Yes. The bank loan covers 75-80% of net capex (after capex grant). For a 500 kW project costing ₹1.8 Cr in West Bengal with 10% WBREDA grant (₹18 lakh), the net capex is ₹1.62 Cr; bank loan at 80% LTV is ₹1.30 Cr; you contribute ₹32 lakh (₹50 lakh-₹18 lakh grant). Effective Year-1 cash outflow drops materially with state grants stacked on bank financing.

How long does bank loan sanction take?

Solar term loan sanction takes 4-12 weeks from complete application: 2-3 weeks for bank technical review (project feasibility, EPC creditworthiness, borrower credit), 2-3 weeks for sanction approval committees, 1-2 weeks for documentation, 1-2 weeks for disbursement scheduling. SBI/PSUs are typically slower (8-12 weeks); private banks (HDFC, ICICI, Axis) are faster (4-7 weeks); NBFCs (Tata Capital, Aditya Birla) are fastest (3-5 weeks) but at slightly higher rates.

What's the right finance structure for a multi-state factory chain?

For a multi-state factory chain (5+ plants across 3+ states), the optimal structure is portfolio-level financing: master bank loan facility against the corporate's consolidated balance sheet, drawn down site-by-site as projects commission. This achieves consistent rate, simplified documentation, and fastest deployment. Sun Wave coordinates with the borrower's relationship bank to structure such facilities for portfolio buyers.

Can a non-profit educational institution get bank finance for solar?

Yes, but with caveats. Most banks lend to registered Section 8 companies and trusts at slightly higher rates (9.75-10.50% pa) due to perceived higher risk on cash flows. Many educational institutions instead choose RESCO/OPEX (zero capex) which transfers the financing burden to the developer. NABARD's RIDF and PMEGP grants apply to certain non-profit categories. See our educational institutions post.

Sources

• SBI / HDFC / ICICI Solar Term Loan Schemes — Public disclosures FY 2026
• IBEF / RBI Banking Sector Reports 2025-26
• India installs record 45 GW solar capacity in FY2026 — pv magazine India