Cash · 100% Self-Fund
Cash THB 48-52M for 2 MW · no interest · 25-yr NPV +74M (highest) · stack BOI Section 7.1 (8-yr CIT) + Section 30 + EEC +50% in full · no covenants · no reporting burden · fits cash-rich CFOs with hurdle ≤ 12%.
4-Way CFO Guide · MLR 2026 · 25-Yr NPV
Solar Financing Options — Thailand Factories 2026
Choose between Cash · Thai Bank Loan (EXIM / KBank K-Energy / Krungsri / SCB / BBL) · Operating Lease · Solar PPA. Grounded in Bank of Thailand MLR 2026 + BOI Section 30/31 stacking + 25-yr NPV for a 2 MW factory. Answers the CFO's single question: which route maximizes NPV?
15 dimensions25-yr NPV5 Thai banks
16-min read · updated 2026-04-24
Disclaimer
All loan interest rates, lease rentals, PPA rates, and NPV figures are illustrative. Based on Bank of Thailand MLR 2026-Q1 (~7.125%) + each bank's quarterly rate announcement + BOI Category 7.1 2026-Q1 list + ERC TOU peak THB 3.88-3.95/kWh. Always consult a bank officer, BOI-approved advisor, and Thai CPA before committing.
Answer in one paragraph
Thai factories have 4 solar-financing routes. Cash (highest ROI, no debt; requires THB 48-52M for 2 MW). Thai Bank Loan (EXIM Green 5.5-7% cheapest; KBank K-Energy 6.5-8.5%; Krungsri / SCB / BBL; preserves working capital; keeps full BOI + interest tax shield). Operating Lease (5-10 yr; flexible; TFRS 16 on-balance; partial BOI). Solar PPA (zero CapEx; off-balance; operator bears 100% risk; no BOI). 25-yr NPV: Cash +74M · Loan +68M · Lease +42M · PPA +34M (2 MW, 12% discount). CFOs with full cash pick Cash; partial pick Loan; uncertain pick Lease; cash-constrained pick PPA.
The 4 Routes: Cash · Loan · Lease · PPA
Each route fits a different CFO profile. The wrong choice can mean a 25-yr NPV loss of THB 30-40M. This guide helps the CFO decide using real numbers from Bank of Thailand + BOI + ERC (all figures illustrative — see disclaimer above).
Thai Bank Loan · 70-80% LTV
20-30% down + 7-10 yr loan @ 5.5-8.5% (EXIM Green cheapest; KBank K-Energy / Krungsri / SCB / BBL). 25-yr NPV +68M. Factory owns asset → full BOI + interest tax shield (double shield). Preserves working capital. DSCR ≥ 1.2 covenant.
Operating Lease · 5-10 yr
Flat rental, THB 300-440K/mo for 2 MW, 5-10 yr. End-of-term: return / buyout / renew. TFRS 16 on-balance (ROU asset + lease liability). Finance Lease variant qualifies for partial BOI Section 30. 25-yr NPV +42M.
Solar PPA · 0 CapEx
Operator (IPP) funds 100%. Factory pays THB 2.70-3.55/kWh fixed 15-20 yr (10-30% below grid). Operator bears O&M + performance + FX risk. TFRS 16 service (off-balance) → D/E unchanged → pre-IPO friendly. No BOI. 25-yr NPV +34M.
15-Dimension Comparator
15 CFO-facing dimensions. Green = best in that row · amber = mid · blue = situational. Most important for CFOs: upfront, BOI, balance-sheet, 25-yr NPV, who-wins.
| Dimension | Cash | Thai Bank Loan | Operating Lease | Solar PPA |
|---|---|---|---|---|
| Upfront capital | 100% · THB 48-52M (2 MW) | 20-30% down payment (THB 10-15M) | 10-15% security deposit (THB 5-8M) | THB 0 |
| Monthly payment | None (asset free-and-clear) | THB 500-650K/mo (7-10 yr) | THB 300-440K/mo (5-10 yr) | Pay-per-kWh · ~THB 513K/mo avg |
| BOI Sec 7.1 / 30 eligibility | Yes · full 8-yr CIT exemption | Yes · factory still owns asset + loan interest tax-deductible | Partial · only Finance Lease + ROU substance | No · operator is the CapEx holder |
| Balance-sheet impact | Asset + no debt (no D/E impact) | Asset + term loan liability (raises D/E) | ROU asset + lease liability (TFRS 16 on-balance) | Off-balance-sheet (service contract) |
| Asset ownership | Factory Day 1 · permanent | Factory Day 1 · bank lien until payoff | Lessor · buyout or return at end | Operator · transfers THB 1 at yr 15-20 |
| Commitment term | N/A (own asset) | 7-10 yr (some projects 15 yr) | 5-10 yr · early-exit schedule | 15-20 yr · early termination 30-50% penalty |
| Interest / implicit rate (2026) | 0% · opportunity cost = internal hurdle rate 10-12% | 5.5-8.5% MLR-linked (EXIM cheapest · KBank K-Energy next) | Implicit 8-11% (includes O&M + risk premium) | Effective 9-12% (operator IRR embedded in THB/kWh) |
| Prepayment flexibility | N/A (no debt) | Usually free after yr 3 (some banks charge 1-2% prepayment) | Pre-agreed buyout schedule · NPV-based | Hard · NPV buyout + 30-50% penalty |
| Performance / generation risk | Factory bears (EPC warranty 12-24 mo) | Factory bears (asset pledged to bank) | Shared per SLA · lessor covers uptime | Operator 100% · Performance Ratio guarantee |
| Currency risk (USD equipment) | Factory bears all (module + inverter USD) | Factory bears · some banks offer FX hedge add-ons | Lessor bears (embedded in rental) | Operator bears 100% |
| Depreciation / tax shield | 5-yr straight-line + BOI exemption | Same as Cash + interest tax-deductible (double shield) | 100% OpEx rental (Operating Lease) or ROU depreciation (Finance) | 100% OpEx electricity tax-deductible |
| Approval time | Instant (board-level decision) | 45-90 days (collateral + credit review) | 30-60 days (lessor credit review) | 60-120 days (operator DD + site survey) |
| End-of-term outcome | Asset runs 20-25 more yr (high residual) | Lien released · asset free-and-clear | Return / buyout / renew | Transfer at THB 1 or renew 5-yr |
| Covenant / restriction | None | Financial covenants: DSCR ≥ 1.2 · D/E ≤ 2.5 · min EBITDA · cross-default clause | Use restriction + insurance covenant + return condition | Grid access commitment · off-taker obligation · no competing solar |
| Who this model fits | CFO with unrestricted cash > CapEx + BOI + hurdle ≤ 12% | Cash-rich company wanting tax shield + preserve liquidity | Mid-tenor factory · uncertain 5-10 yr plan | Cash-constrained + OpEx simplicity + stable site |
Thai Bank Green Loan Rates · 2026-Q1
Bank of Thailand MLR reference ~7.125% (2026-Q1). Each bank publishes its own MLR + margin per product. Rates indicative — confirm with bank officer before committing. Cites each bank's public product page.
| Bank | Product | Rate | Basis | Max term | Eligibility | Approval time | Source |
|---|---|---|---|---|---|---|---|
| EXIM Thailand | EXIM Green Loan | 5.5-7.0% | MLR-1.5 to MLR-0.5 (preferential) | Up to 10 yr | Exporter or factory with Green Industry / BOI / ISO 14001 · CapEx ≥ THB 5M | 60-75 days | www.exim.go.th |
| Kasikornbank (KBank) | K-Energy Saving Loan | 6.5-8.5% | MLR-0.5 to MLR+1.5 | Up to 7 yr (10 yr for select projects) | SME or corporate · CapEx THB 1-200M · KBank customer profile | 45-60 days | www.kasikornbank.com |
| Bank of Ayudhya (Krungsri / BAY) | Krungsri SME Solar / Energy Saving Loan | 6.75-8.75% | MLR-0.25 to MLR+1.75 | Up to 7 yr | SME · CapEx THB 1-100M · payback ≤ 7 yr estimated | 45-75 days | www.krungsri.com |
| Siam Commercial Bank (SCB) | SCB Green Finance / Sustainable Loan | 6.75-8.25% | MLR-0.25 to MLR+1.25 | Up to 7 yr | Corporate or SME · ESG screening + THB 10M minimum CapEx | 60-90 days | www.scb.co.th |
| Bangkok Bank (BBL) | Industrial Term Loan (general) | 7.0-8.75% | MLR to MLR+1.75 (no green discount) | Up to 10 yr | Standard corporate client · DSCR ≥ 1.2 · no ESG required | 45-90 days | www.bangkokbank.com |
Bottom line: EXIM Green Loan cheapest (5.5-7%; exporter or green-certified required). KBank K-Energy is second (6.5-8.5%; broad eligibility). Krungsri / SCB / BBL similar. BBL has no green discount but faster approval for legacy BBL clients.
BOI Section 30 / 31 · How It Stacks with Each Route
BOI Section 30 provides double deduction on energy-saving spend (for businesses without direct Category 7.1 promotion). Section 31 grants +50% CIT exemption in EEC zones. Both require CapEx-ownership. Cash + Loan = full claim. Lease = only Finance Lease + ROU substance. PPA = no claim. See BOI solar incentives 2026 guide for details.
Cash · full eligibility for Sections 7.1 + 30 + 31 · asset is 100% factory-owned
Loan · same full eligibility as Cash (bank lien doesn't affect BOI) + interest tax-deductible (double shield)
Operating Lease · usually no · Finance Lease + THB 1 bargain-purchase + ROU substance → partial Section 30 · legal opinion required
PPA · not eligible · Operator is the CapEx holder · factory has no tax-deductible asset · trade-off = Operator covers risk + O&M almost entirely
25-Yr NPV · 2 MW Factory · 4 Scenarios
NPV (Net Present Value) = sum of future cashflows discounted to present. The CFO's primary tool for comparing long-horizon investments. Assumptions: 2 MW generating 2.2M kWh/yr · grid TOU THB 3.95/kWh · PPA rate THB 2.80/kWh · Loan 7.5% 7-yr (KBank K-Energy midpoint) · 12% discount · 20% CIT · 8-yr BOI exemption (Cash + Loan only). All figures illustrative.
| Year | Cash NPV (THB) | Loan NPV (THB) | Lease NPV (THB) | PPA NPV (THB) | Notes |
|---|---|---|---|---|---|
| Year 0 (start) | -฿50M | -฿12M | -฿6M | ฿0 | Cash 50M · Loan 12M down · Lease 6M deposit · PPA 0 |
| Year 5 | +฿10M | +฿5M | +฿8M | +฿9M | All models positive; Cash leads (+10M NPV); Loan still burdened by debt service |
| Year 10 | +฿38M | +฿30M | +฿22M | +฿18M | BOI exemption yrs 1-8 pushes Cash + Loan ahead · Lease buyout window |
| Year 15 | +฿58M | +฿52M | +฿32M | +฿26M | Cash - Loan gap narrows · Lease / PPA fall behind materially |
| Year 25 (system life) | +฿74M | +฿68M | +฿42M | +฿34M | 25-yr NPV: Cash +74M · Loan +68M · Lease +42M · PPA +34M (12% discount) |
25-yr bottom line: Cash +74M · Loan +68M · Lease +42M · PPA +34M. Cash-Loan gap = 6M (interest tax shield closes most of the BOI-only gap in later years). Cash-PPA gap = 40M. If cash is available, Cash wins. If cash is constrained but solvent, use Loan. If truly cash-constrained, Lease or PPA — accepting a 30-40% NPV haircut.
Decision Tree · 4 CFO Scenarios
Pick the condition matching your factory — get a recommended route with rationale. Based on a 2 MW factory. Scale with the PPA vs Self-Invest calculator.
3 Key Risk Dimensions
Before committing, the CFO must answer the board on 3 risks: currency, interest rate, covenant.
1 · Currency risk (USD equipment vs THB revenue)
Modules + inverter are 70-80% of CapEx and priced in USD (Jinko, Longi, Trina, Sungrow, Huawei). THB weakens 10% → CapEx rises ~7%. Cash / Loan = factory bears it; some banks offer FX hedge add-ons. Lease / PPA = Operator / Lessor bears it, baked into rental / PPA rate. Tip: if FX volatility > ±5%, lock hedging before PO.
2 · Interest rate volatility (MLR)
Thai MLR tracks BOT policy rate. 2022-2024 rose from 5.50% → 7.125%. MLR-linked loans need sensitivity: +100bps MLR → +THB 0.5-0.8M/yr interest on a 2 MW loan. Mitigations: fixed-rate tranche or interest rate swap (for loans > THB 50M). Lease / PPA rates are fixed (no rate risk, but opportunity cost if MLR falls).
3 · Covenant risk (loan + lease restrictions)
Typical loan covenants: DSCR ≥ 1.2 · D/E ≤ 2.5 · min EBITDA · cross-default. A miss can trigger default on other loans. Lease covenants: use restriction + insurance + return condition. PPA covenants: grid access commitment + no competing solar. PPA exit penalty = 30-50% of remaining NPV. CFO must read term sheet + legal review before signing.
HowTo · 5-Step Financing Decision Framework
Step 1 · Audit the balance sheet
Identify unrestricted cash · free cashflow · current D/E · DSCR · target IPO (if any). Most important: do you have cash > CapEx THB 48-52M for 2 MW? What is your hurdle rate (typically 10-12%)?
Step 2 · Check BOI eligibility
If the factory qualifies for BOI Section 7.1 / 30 / 31 → Cash or Loan win clearly (8-yr CIT exemption). Without BOI → Lease or PPA close the NPV gap to Cash. See BOI solar incentives 2026 guide for the full matrix.
Step 3 · Get term sheets from 2-3 banks
Compare EXIM Green (if eligible) + KBank K-Energy + Krungsri / SCB / BBL. Review headline rate + fees + DSCR covenant + prepayment penalty. Negotiate margin -25bps if you have a multi-product relationship.
Step 4 · Run 25-yr NPV + sensitivity
Use PPA vs Self-Invest calculator with real numbers. Test 3 scenarios: base · MLR +100bps · PPA rate -10%. If Cash-Loan NPV gap ≤ 5-10% → pick Loan (preserve liquidity). If Cash NPV > Lease/PPA ≥ 30% → pick Cash. If no cash at all → pick between Lease vs PPA per balance-sheet goal.
Step 5 · Legal + CPA review + sign
Loan: legal review covenants + cross-default + hedging clause. Lease: CPA review TFRS 16 classification (Operating vs Finance). PPA: legal review grid access + termination penalty. Always have a BOI-approved advisor review Section 30/31 stacking. CapSolar free consultation delivers a 4-scenario financial model in 5 business days.
Author note
By Frank Lin · CEO, CapSolar. Our team has delivered 16.5 MWp across 8 factories in Thailand. I've negotiated loan term sheets with 20+ CFOs (EXIM / KBank / Krungsri). The most common mistake: listing full CapEx in the EBITDA projection but forgetting to count the solar savings — DSCR comes out low and the bank declines. This guide trains the CFO to think like the Banker before submitting the loan application.
Reviewed by: Chief Engineer · CapSolar (2026-04-24)
Frequently Asked Questions
Want to go deeper on BOI Section 30 / 31? Read BOI Solar Incentives 2026 guide · For the 3-way EPC / PPA / Lease decision tree → EPC vs PPA vs Lease.
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