Note: this article overlaps with our other piece comparing outright purchase and PPA financing — we're covering it again here with a broader lens because financing questions come up so often from hotel and factory owners, and a bank loan is a third option worth putting on the table alongside those two.
For a hotel or factory considering rooftop solar, the biggest early decision often isn't system size — it's how to pay for it. Three financing paths are common in Thailand: paying cash upfront, taking a bank loan, or signing a Power Purchase Agreement (PPA) where a third party owns and maintains the system and you simply buy the electricity it produces. Each shifts the cost, risk, and ownership differently.
| Path | Upfront Cost | Who Owns the System | Who Handles Maintenance |
|---|---|---|---|
| Cash purchase · ซื้อสด | Full amount · เต็มจำนวน | You, from day one · คุณ ตั้งแต่วันแรก | You (or a service contract you arrange) · คุณ (หรือจ้างบริการบำรุงรักษาเอง) |
| Bank loan · กู้ธนาคาร | Partial (down payment) · บางส่วน (เงินดาวน์) | You, once the loan is repaid · คุณ เมื่อผ่อนหมด | You (or a service contract you arrange) · คุณ (หรือจ้างบริการบำรุงรักษาเอง) |
| PPA · สัญญา PPA | None or minimal · ไม่มีหรือน้อยมาก | The PPA provider, for the contract term (often 15–25 years) · ผู้ให้บริการ PPA ตลอดอายุสัญญา (มักยาว 15–25 ปี) | The PPA provider · ผู้ให้บริการ PPA |
Three financing paths compared
Cash Purchase — Highest Return, Highest Upfront Commitment
Paying cash gives you the full savings from day one — there's no interest, no monthly PPA rate, and you own the asset outright. It's the best long-term return for an owner with the capital available and confidence in holding the property for the system's full 20–25 year lifespan. The downside is tying up a large sum that could otherwise fund other business needs.
Bank Loan — A Middle Ground
A bank loan lets you spread the cost over several years while still owning the system. Many Thai banks offer green/energy-efficiency loan products with competitive rates for commercial solar, since it's seen as a low-risk asset that generates predictable savings. The math generally works if the monthly loan payment is lower than the electricity bill savings the system produces — meaning the project can be cash-flow positive from month one, even before the loan is paid off. Loan terms, rates, and eligibility vary by bank and by the business's financial standing, so it's worth comparing offers from more than one lender.
PPA — No Capital Outlay, Lower Total Savings
Under a PPA, a third-party provider installs, owns, and maintains the system on your roof at little or no upfront cost to you, and you agree to buy the electricity it generates at a fixed rate — typically set below your current grid rate, so you save from the first bill. Because you never own the asset, your total savings over the contract term are lower than if you'd purchased outright, and you're locked into the agreed rate and provider for the contract length (often 15–25 years). PPAs suit owners who want savings without capital outlay or maintenance responsibility, and who are comfortable with a long-term contractual commitment.
- Ask any PPA provider what happens if you sell the property before the contract ends — a transferable or buyout clause matters a lot for hotels that may change ownership
- For a bank loan, confirm whether the lender requires the solar system itself as collateral, or accepts the business's existing credit standing
- Whichever path you choose, get a written maintenance responsibility schedule — panel cleaning, inverter servicing, and monitoring shouldn't be left ambiguous
Not sure which financing path fits your hotel or factory? We'll run the numbers for cash, loan, and PPA side by side for your specific system size.
Frequently Asked Questions
Which option has the best return over 25 years?
Cash purchase typically delivers the highest total return since there's no interest and no third party taking a margin on the electricity. A bank loan comes close once repaid, since interest cost is usually well below the value of the savings. A PPA gives the lowest total savings of the three, since you're paying for someone else's capital and margin for the life of the contract, but it also requires no capital and no maintenance responsibility from you.
Can I switch from a PPA to owning the system later?
Some PPA contracts include a buyout option at a set point in the term or at contract end — this isn't universal, so it needs to be negotiated and written into the agreement upfront if it matters to you.
Does the financing choice affect how the system is sized or installed?
Not technically — the panels, inverters, and installation quality should be the same regardless of how it's financed. What differs is who signs off on system size and equipment choice: with cash or a loan, you have full control; with a PPA, the provider typically proposes the system design as part of the contract, so review it carefully before signing.