Solar PPA in Thailand: Zero Investment, Instant Savings
🔑 Key Takeaways
- A Solar PPA lets you go solar with zero upfront investment — the provider owns and maintains the system
- You pay a fixed rate of ฿4.50/kWh vs ฿5.50–฿6.50/kWh from PEA — saving 15–30% immediately
- Contract terms are typically 15–20 years with a fixed or slightly escalating rate
- Best suited for businesses with monthly bills over ฿30,000 and adequate roof space
- At contract end, you can purchase the system at residual value or renew
What if you could cut your electricity bill by 15–30% starting next month — without spending a single baht on equipment? That's exactly what a Solar Power Purchase Agreement (PPA) offers.
The PPA model has transformed solar adoption worldwide, and it's now available in Thailand. For businesses tired of watching their PEA bills climb year after year, it's the lowest-risk way to go solar.
1. What Is a Solar PPA?
A Power Purchase Agreement (PPA) is a contract where a solar company (like Bustan Energy) installs, owns, and maintains a solar system on your roof — and you simply buy the electricity it produces at a rate lower than what you pay PEA.
The Simple Version
- You provide: Your roof space
- We provide: The solar system, installation, maintenance, monitoring — everything
- You pay: A fixed rate per kWh for the solar electricity (lower than PEA)
- You save: The difference between our rate and PEA's rate — immediately, month one
Think of it like this: instead of paying PEA ฿6 for every unit of electricity, you pay Bustan Energy ฿4.50 for the solar portion. The ฿1.50 difference per unit goes straight to your bottom line.
2. How It Works: Step by Step
- Energy audit: We analyze your last 12 months of PEA bills to understand your consumption patterns
- Site assessment: Our engineers evaluate your roof — size, condition, orientation, shading
- System design: We design the optimal system to maximize your savings based on your actual usage
- Contract signing: We agree on the PPA rate, term, and conditions
- Installation: We install the system at our cost — typically 1–2 weeks for commercial projects
- PEA connection: We handle all grid connection paperwork and meter installation
- Start saving: Your system goes live. You receive two bills — a reduced PEA bill plus a Bustan Energy bill for solar electricity. Combined, they're less than your old PEA bill alone
3. PPA vs PEA: Real Savings Breakdown
Let's look at a real example — a medium-sized business with a ฿80,000/month electricity bill:
| Metric | Before Solar | With PPA |
|---|---|---|
| Monthly consumption | 13,000 kWh | 13,000 kWh |
| Solar generation | — | 7,500 kWh (58%) |
| PEA bill (at ฿6.15/kWh avg) | ฿80,000 | ฿33,825 (5,500 kWh) |
| Bustan Energy PPA bill | — | ฿33,750 (7,500 kWh × ฿4.50) |
| Total monthly bill | ฿80,000 | ฿67,575 |
| Monthly savings | — | ฿12,425 (15.5%) |
| Annual savings | — | ฿149,100 |
| 20-year savings | — | ฿2,982,000+ |
And remember: PEA rates tend to increase over time (Ft charges have been volatile), while your PPA rate stays fixed. So your savings actually grow larger each year.
Savings Scale with Consumption
| Current Monthly Bill | Est. Monthly Savings (PPA) | Est. Annual Savings |
|---|---|---|
| ฿30,000 | ฿4,000–฿6,000 | ฿48,000–฿72,000 |
| ฿80,000 | ฿10,000–฿15,000 | ฿120,000–฿180,000 |
| ฿150,000 | ฿20,000–฿35,000 | ฿240,000–฿420,000 |
| ฿300,000+ | ฿40,000–฿70,000 | ฿480,000–฿840,000 |
4. Who Qualifies for a Solar PPA?
Ideal PPA Candidates
- Monthly electricity bill: ฿30,000+ (higher = better ROI for both parties)
- Roof space: Minimum 150 m² of unshaded, structurally sound roof
- Roof ownership: You own the building or have a long-term lease (10+ years remaining)
- Daytime consumption: High daytime electricity use (ideal for offices, factories, hotels, malls)
- Creditworthiness: Established business with stable operations
Who PPA Works Best For
- Hotels & resorts — High daytime A/C and pool pump loads (see our hotel solar guide)
- Factories & warehouses — Large roof areas, consistent consumption (see our commercial solar guide)
- Shopping malls & retail — Peak usage aligns perfectly with solar production
- Schools & universities — Budget-conscious with large roof areas
- Hospitals & clinics — 24/7 operation benefits from reduced rates
When PPA May Not Be the Best Option
- Small residential properties — Bills under ฿5,000/month make PPA economics challenging
- Short-term leases — Need 10+ years remaining on your lease
- Buildings with heavy shading — Trees, adjacent buildings blocking sunlight
- Poor roof condition — Roof may need repair/replacement before solar installation
For smaller properties, direct purchase often makes more financial sense. See our savings calculator for comparison.
5. Contract Terms & What to Watch For
Typical PPA Terms in Thailand
| Term | Typical Range | Bustan Energy Standard |
|---|---|---|
| Contract duration | 10–25 years | 15–20 years |
| PPA rate | ฿3.80–฿5.00/kWh | ฿4.50/kWh (fixed) |
| Annual escalation | 0–3% | 0% (truly fixed) |
| Performance guarantee | 80–90% of design output | 85% guaranteed |
| Maintenance | Included or separate | Fully included |
| Insurance | Varies | Included (equipment + liability) |
| End-of-term options | Purchase, renew, or remove | All three options available |
Key Things to Watch For
- Escalation clauses: Some providers include 1–3% annual rate increases. Bustan Energy offers a truly fixed rate — no surprises
- Performance guarantees: Ensure the provider guarantees a minimum energy output. If the system underperforms, they should compensate you
- Early termination: Understand the buyout formula if you want to end the contract early or purchase the system
- Roof maintenance access: The contract should specify how roof repairs are handled (who moves panels, who pays)
- Insurance & liability: The provider should carry insurance covering equipment damage and third-party liability
6. PPA vs Direct Purchase: Which Is Better?
| Factor | PPA | Direct Purchase |
|---|---|---|
| Upfront cost | ฿0 | ฿870,000–฿5,800,000 (30–200 kW) |
| Day-1 savings | 15–30% off bill | 50–70% off bill (after payback) |
| Total lifetime savings | Lower (you're sharing savings) | Higher (you keep 100%) |
| Maintenance | Included | Your cost (฿5,000–฿15,000/year) |
| Risk | Zero — provider bears all risk | Equipment & performance risk on you |
| Balance sheet impact | Off-balance sheet (operating expense) | Capital expenditure / asset |
| Best for | Cash-constrained, risk-averse, leased | Property owners with capital, wanting max ROI |
Bottom line: If you have the capital and own the building, direct purchase gives you the highest total returns. If you want zero risk, zero investment, and immediate savings, PPA is the way to go. Many businesses start with PPA and later purchase the system at a discounted residual value.
🇹🇭 สรุปภาษาไทย — Solar PPA
สัญญาซื้อขายไฟฟ้าจากพลังงานแสงอาทิตย์ (Solar PPA) ช่วยให้ธุรกิจติดตั้งโซลาร์เซลล์ได้โดยไม่ต้องลงทุนล่วงหน้า ผู้ให้บริการ (Bustan Energy) จะติดตั้ง เป็นเจ้าของ และดูแลรักษาระบบ คุณจ่ายเพียงค่าไฟฟ้าจากโซลาร์ในราคาคงที่ 4.50 บาท/หน่วย
เปรียบเทียบกับค่าไฟ กฟภ. ที่ 5.50–6.50 บาท/หน่วย คุณประหยัดได้ 15–30% ทันทีตั้งแต่เดือนแรก ไม่ต้องลงทุน ไม่มีความเสี่ยง
เหมาะสำหรับธุรกิจที่มีค่าไฟเกิน 30,000 บาท/เดือน มีพื้นที่หลังคาเพียงพอ และมีสัญญาเช่าระยะยาว (10 ปีขึ้นไป)
Bustan Energy ให้บริการ PPA ด้วยอัตราคงที่ ไม่มีค่าปรับขึ้นรายปี รับประกันประสิทธิภาพ 85% รวมการดูแลรักษาทั้งหมด ติดต่อเพื่อรับการวิเคราะห์พลังงานฟรี!
Frequently Asked Questions
What happens if I sell the building during the PPA contract?
The PPA contract is typically transferable to the new owner. This can actually be a selling point — the new owner inherits guaranteed electricity savings from day one. We help facilitate the transfer process.
Can I cancel the PPA early?
Yes, but there's usually an early termination fee based on the remaining contract value. Alternatively, you can buy out the system at a calculated residual value. The exact terms are specified upfront in the contract.
What if the solar system doesn't produce enough energy?
Bustan Energy guarantees a minimum annual production (85% of design output). If we fall short, we compensate you for the difference. You only pay for the electricity you actually receive.
Who handles maintenance and repairs?
Bustan Energy handles all maintenance, monitoring, and repairs at no additional cost. This includes panel cleaning, inverter servicing, and any component replacements. We monitor system performance 24/7 remotely.
Is a PPA the same as a solar lease?
Similar but different. In a PPA, you pay per kWh of electricity produced. In a lease, you pay a fixed monthly fee regardless of production. PPAs are more common in Thailand and generally more favorable for the customer since you only pay for actual output.
Does the PPA rate ever increase?
Bustan Energy offers a truly fixed rate for the full contract term — no annual escalation. Some other providers include 1–3% annual increases, so always check the fine print. Our ฿4.50/kWh rate is locked in for the entire contract.
Can I combine PPA with net billing?
In a PPA arrangement, the system owner (Bustan Energy) typically handles net billing. Any excess electricity exported to the grid benefits the system economics and helps keep your PPA rate competitive. The specifics depend on the contract structure.
Related Articles
Find Out If PPA Is Right for You
Send us your last 3 months of PEA bills and we'll calculate your exact savings under a PPA. Free, no-obligation analysis.
📞 Call +66 94 669 2011