Solar PPA vs Buying Outright: The Honest Comparison Every Thai Business Owner Needs

Anchisa S.
Apr 6
4 min read

The economics of solar in Thailand have shifted to the point where the question is no longer whether solar makes financial sense for a commercial or industrial operation — it almost always does. The real question now is how to structure the investment.

Two models dominate: you can buy the system outright (direct purchase), or you can access it through a Power Purchase Agreement (Solar PPA) — paying a fixed rate for the electricity the system generates, with no capital outlay. Both have merit. Both have real limitations. This article gives you the honest comparison.

Model 1: Direct Purchase (Own the System)

In a direct purchase, you pay for the full system upfront — or finance it through a bank loan — and you own the asset outright. You receive all the electricity the system generates. After the simple payback period (typically 5-8 years for a well-designed industrial system in Thailand), the electricity is effectively free for the remaining 17-20 years of the system's life.

Who this works for:

Businesses with available capital or strong banking relationships who want to maximize long-term ROI. Facilities that have high and stable electricity consumption. Operations planning to be at the same location for 15+ years. Companies with ESG reporting obligations who want to own clean energy assets on their balance sheet.

Key considerations:

The return on a direct purchase is excellent — typical IRR in Thailand for a well-executed industrial solar project runs 12-18% over 25 years. But the capital is tied up, and you carry full responsibility for maintenance, performance monitoring, and any system upgrades.

Model 2: Power Purchase Agreement (Solar PPA)

A PPA is a service agreement: a solar developer installs and owns the system on your facility. You agree to purchase the electricity it generates at a predetermined rate — typically 10-20% below your current grid tariff — for a contract period of 10-25 years.

The value proposition is straightforward: you get lower electricity costs immediately, with no capital investment and no technical responsibility. The developer owns, operates, and maintains the system.

Who this works for:

Businesses that need to conserve capital for core operations. Companies with limited or uncertain long-term tenure at their current facility. Organizations that want the financial benefit of solar without the asset management burden. Businesses in sectors where capital allocation is tightly controlled by parent companies or investors.

Key considerations:

The savings per unit are lower than direct ownership (because the developer takes a margin), but you take zero risk and deploy zero capital. You are also locked into the agreement for its duration — so the quality of the developer matters enormously. If your PPA provider disappears or underperforms, your remedy options are limited.

PPA works beautifully when the developer is strong. It works terribly when they're not. The quality of who you sign with is the most important variable in the PPA model.

Side-by-Side: The Key Numbers

For a 500kW system on a Thai factory currently paying 5.50 baht/kWh to the grid:

• Direct purchase cost: approximately 12-15 million baht installed

• Simple payback: 5.5-7 years

• 25-year net savings: 25-40 million baht (varies with grid tariff escalation)

• PPA rate: 4.20-4.80 baht/kWh (typical range)

• Annual savings on PPA: 350,000-630,000 baht with zero capital outlay

• 25-year savings on PPA: 8-15 million baht (lower, but no capital deployed)

The direct purchase wins on total value. The PPA wins on capital efficiency and risk elimination. Which matters more depends on your business model and capital priorities.

A Third Option: Equipment Leasing

Modern Green Energy — Greenergy's subsidiary for alternative energy financing — also offers equipment leasing arrangements, which sit between PPA and direct ownership. In a lease structure, you gain usage of the system for a fixed monthly payment, with an option to purchase at the end of the term.

Lease structures work well for businesses that want eventual ownership but need to preserve capital in the near term. The economics sit between a full PPA and direct purchase.

The Question to Ask Yourself

The right model depends on one fundamental question: what is the highest-value use of your capital right now?

If deploying 15 million baht into solar generates the best return for your business — better than inventory, expansion, or other capex — buy outright. If that capital is needed elsewhere, or if uncertainty about your tenure at the facility makes long-term asset ownership unappealing, a PPA or lease delivers the energy savings without the capital commitment.

Greenergy's business development team works through this analysis with clients as part of our feasibility process — no fee, no obligation. We operate both direct EPC and PPA/leasing through Modern Green Energy, so we can recommend what actually fits your situation rather than what fits our preferred margin.