EPC · Own Day 1
Pay 100% CapEx upfront; factory owns the asset Day 1. Stack BOI Section 7.1 (8-yr CIT) + Section 30 + EEC +50%. 5-yr straight-line depreciation. Payback 4-6 yr; highest 15-yr ROI.
3-Way Comparator · TFRS 16 · BOI Sec 30
Solar EPC vs PPA vs Operating Lease — Thailand Factories 2026
Thailand's only 3-way solar decision guide: 15 dimensions + 15-yr cashflow for a 2 MW factory. Covers TFRS 16 lease accounting, BOI Section 30 stacking, and the CFO-persona decision tree.
15 dimensions15-yr cashflowTFRS 16 + BOI
14-min read · updated 2026-04-24
Disclaimer
All cashflow, CapEx, and tax-savings numbers are illustrative. Based on 2026-Q1 BOI category list + TFRS 16 (FAP) + ERC TOU peak THB 3.88-3.95/kWh. Consult a BOI-approved advisor and Thai CPA before any decision.
Answer in one paragraph
EPC, PPA, and Operating Lease are the three main solar financing models for Thai factories. EPC = self-invest and own the asset from Day 1 (CapEx THB 25-35M/MW, highest ROI, full BOI eligibility). PPA = operator funds the system; the factory pays only for electricity at THB 2.70-3.55/kWh fixed 15-20 yr (zero CapEx, off-balance-sheet, no BOI). Operating Lease = rent the system for 5-10 yr with a buyout option (Right-of-Use asset under TFRS 16, maximum flexibility). Cash-rich CFOs choose EPC; cash-constrained pick PPA; mid-tenor uncertainty favors Lease.
The 3 Models: EPC · PPA · Lease
Each model fits a different CFO profile. The wrong choice costs THB 20-50M over 15 years. This guide isn't long for length — the goal is to help a CFO decide in one meeting.
PPA · 0 CapEx
Operator (IPP) funds 100%. Factory signs 15-20 yr power purchase at THB 2.70-3.55/kWh fixed (10-30% below grid). Operator absorbs O&M + performance risk. Under TFRS 16, classified as a service contract, not a lease (off-balance-sheet).
Operating Lease · 5-10 yr
Flat monthly rental, 5-10 yr term, pre-agreed buyout schedule. Under TFRS 16, on-balance-sheet (ROU asset + lease liability). Flexible end-of-term: return / buyout / renew. Best for CFOs with mid-tenor plant-life uncertainty.
15-Dimension Comparator
Every cell backed by evidence. Click each row for rationale. Green = best · amber = mid · blue = situational.
| Dimension | EPC (Own) | PPA (Operator) | Operating Lease |
|---|---|---|---|
| Upfront CapEx | 100% · THB 25-35M per MW | THB 0 | 10-15% security deposit |
| Asset ownership | Factory Day 1 (permanent) | Operator · transfer yr 15-20 (THB 1) | Lessor · buyout option per schedule |
| O&M responsibility | Factory (or 3rd-party ~THB 80-120K/MW/yr) | Operator 100% (bundled in THB/kWh) | Lessor 100% (bundled in rental) |
| Performance / generation risk | Factory bears (minus 12-mo warranty) | Operator 100% (Performance Ratio guarantee) | Shared — depends on SLA |
| Tariff hedge tenor | Self-generation (25-yr hedge = system life) | THB 2.70-3.55/kWh fixed 15-20 yr (10-30% discount) | Flat monthly rental · 5-10 yr fixed |
| Early termination | N/A — factory owns the asset | NPV-based buyout · 30-50% penalty on remaining NPV | Pre-agreed buyout schedule (early-exit table) |
| BOI Sec 30 / 7.1 eligibility | Yes — factory holds CapEx, claims full 8-yr CIT exemption | No — Operator claims (not the factory) | Partial — only if Finance-Lease structure (ROU + bargain-purchase) |
| Tax / depreciation treatment | 5-yr straight-line depreciation + BOI exemption | 100% OpEx (fully tax-deductible) | OpEx rental (Operating Lease) · ROU + interest split (Finance Lease) |
| Balance-sheet / TFRS 16 | Asset + no debt (cash-funded) · no D/E impact | Off-balance-sheet (service contract — no lease) | On-balance-sheet — ROU asset + lease liability · D/E impact |
| End-of-term outcome | Asset operates 20-25 more yrs (high residual value) | Transfer at THB 1 or renew 5-yr | Return / buyout / renew |
| Buyout pathway | N/A — already owned | Yr 7-10 · fair-market value (FMV) calc | Pre-agreed buyout schedule in contract |
| 5-yr cashflow (2 MW factory) | -60M → +22M net | 0 → +18M savings | -3M → +14M savings |
| 10-yr cumulative | +48M net | +40M savings | +30M savings |
| 15-yr cumulative | +120M (asset + savings) | +68M (savings only) | +52M (post-buyout) |
| Who this model fits | Cash-rich CFO wanting max ROI + BOI benefits | Cash-constrained factory · OpEx simplicity | Mid-tenor plant uncertainty · may relocate |
15-Yr Cashflow · 2 MW Factory
Assumptions: 2.2M kWh/yr generation · grid TOU THB 3.95/kWh · PPA rate THB 2.80/kWh · 12% discount · 20% CIT · post-BOI CapEx THB 60M (2 MW @ 30M/MW)
| Year | EPC cum (THB) | PPA cum (THB) | Lease cum (THB) | Notes |
|---|---|---|---|---|
| Year 0 (start) | -฿60M | ฿0 | -฿3M | EPC deploys 60M cash · PPA uses none · Lease posts 3M deposit |
| Year 5 | +฿22M | +฿18M | +฿14M | EPC payback reached; all 3 models turn positive |
| Year 10 | +฿48M | +฿40M | +฿30M | EPC pulls ahead of PPA · Lease mid (buyout window yr 7-10) |
| Year 15 | +฿120M | +฿68M | +฿52M | 15-yr spread · EPC +120M · PPA +68M · Lease +52M (buyout-dependent) |
Bottom line: with cash, EPC wins by +52M over 15 yr. Without cash, PPA beats Lease by +16M. Lease wins when plant-life certainty is below 15 yr.
Decision Tree · 4 CFO Scenarios
Pick the condition matching your factory — get a recommended model with rationale. Based on a 2 MW factory. Scale with the PPA vs Self-Invest calculator.
Hybrid Models · 2 Pathways
Sophisticated Thai firms increasingly use 2 hybrid pathways to get both worlds. Both require tighter contract negotiation. Warning: legal + financial advisory costs ~10-15% higher than a straight deal.
Path A · PPA → EPC Buyout Yr 7-10 (FMV)
Sign PPA 15-20 yr with a buyout clause at yr 7-10 at fair-market value (FMV). First 7 yr = OpEx immediate savings. After buyout = factory owns asset + partial BOI Section 30. FMV calc uses residual PV value (NPV method). Tip: lock the FMV formula (discount rate + residual-life assumption) in the contract before signing.
Path B · Lease-to-Own (bargain-purchase THB 1)
Finance-Lease structure; rent for 7-10 yr with rental schedule covering ~95% of CapEx + residual. End-of-term buyout at THB 1. Under TFRS 16, classified as finance lease → factory qualifies for BOI Section 30 (ROU asset substance). Best for factories wanting long-run ownership but smoothed short-term cashflow.
⚠️ BOI Section 30 Stacking: only when factory holds "asset title" or ROU with substance transferring controlling interest. Consult a BOI-approved advisor + CPA first.
TFRS 16 Lease Accounting · Balance-Sheet Impact
TFRS 16 (issued by FAP — Federation of Accounting Professions; aligned with IFRS 16; effective 2020) requires leases > 12 months + non-low-value to be booked as Right-of-Use (ROU) asset + lease liability on-balance-sheet. The three models have distinctly different impacts.
EPC · Factory-owned asset (no lease). Booked as Property, Plant & Equipment (PP&E). Depreciated straight-line 5 yr (with BOI) or 20 yr (standard). No D/E impact.
PPA · Service contract (NOT a lease) — because the operator does not transfer the "right to control" the asset to the factory. Monthly electricity = OpEx. Off-balance-sheet. Suits CFOs wanting low D/E ratio (e.g. pre-IPO).
Operating Lease · on-balance-sheet per TFRS 16. Dr ROU asset + Cr lease liability equal to PV of all rentals. Monthly rental split into interest + principal. Increases both total asset + total liability → affects D/E ratio. Finance Lease is similar but with faster depreciation.
Sources: FAP — Thai Financial Reporting Standard 16 TFRS 16 · PwC Thailand TFRS 16 guide · KPMG Thailand Leases Handbook
HowTo · 4-Step CFO Decision Framework
Step 1 · Answer the cash question
Can the CFO free up unrestricted cash ≥ CapEx (2 MW = THB 60M) in the budget? If no — go PPA or Lease. If yes — go to Step 2.
Step 2 · Check BOI eligibility
Does the factory have DBD + DIW Ror Ngor 4 license + plant age ≤ 10 yr? If yes, eligible for BOI Sec 7.1 + Sec 30 + EEC +50% → EPC is #1 choice. If no — Operating Lease or PPA.
Step 3 · Assess plant-life certainty
Will the factory still be at this site in 15 yr? If yes: EPC (own) or PPA (service). If no: Operating Lease + buyout flexibility. If pre-IPO: PPA to keep balance sheet clean.
Step 4 · Stress-test with tool + CPA review
Use PPA vs Self-Invest calculator with your real numbers (CapEx, grid rate, PPA rate, WACC, tax rate). Get NPV for all 3 models, then consult a Thai CPA to verify TFRS 16 classification before signing. CapSolar free consultation covers every scenario.
Author note
By Frank Lin · CEO, CapSolar. Our team has delivered 16.5 MWp across 8 factories in Thailand. I've seen 12+ CFOs pick the wrong model because they didn't understand TFRS 16 + BOI stacking. This article is what I wish I had when I started this journey 4 years ago.
Reviewed by: Chief Engineer · CapSolar (2026-04-24)
Frequently Asked Questions
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