Government Solar Subsidies and Incentives in Thailand 2026: What Can You Claim?
Government Solar Subsidies and Incentives in Thailand 2026: What Can You Claim?
Thailand’s installed solar capacity is growing at over 13% per year, on track to reach 6.97 GW by 2030 (Energy Tracker Asia, 2025). That growth isn’t accidental. The Thai government has rolled out a stack of subsidies, tax breaks, and buyback programs that make solar more affordable than it’s ever been.
The problem? These incentives are scattered across multiple agencies — DEDE, BOI, ERC, the Revenue Department — each with its own rules, deadlines, and application process. It’s easy to miss one. Worse, some programs can be combined while others can’t, and the details change every year.
This guide maps every solar incentive available in Thailand in 2026. You’ll learn exactly what you can claim, who qualifies, and how to apply — whether you’re a homeowner eyeing rooftop panels or a business planning a large-scale installation. We’ve sourced every figure from government announcements, the Royal Gazette, and official agency data.
TL;DR: Thailand now offers a personal income tax deduction of up to THB 200,000 for residential solar installations, published in the Royal Gazette on March 4, 2026 (Nation Thailand, 2026). Combined with net billing at THB 2.20/kWh and BOI corporate tax exemptions, most homeowners can expect a 4-5 year payback period.
What Solar Subsidies Are Available in Thailand?
Thailand offers four distinct categories of solar incentives as of 2026, each targeting a different group (Mahanakorn Partners, 2025). Understanding which ones apply to your situation is the first step toward maximizing your savings.
Here’s a quick map of what’s available:
1. Personal Income Tax Deduction (Homeowners)
Deduct up to THB 200,000 from your taxable income for installing a rooftop solar system. Now law — published in the Royal Gazette on March 4, 2026.
2. 150% Business Tax Deduction (Businesses)
Companies and professionals get a 150% deduction on investments in DEDE-certified energy-efficient equipment, including solar.
3. BOI Investment Incentives (Large Projects)
Eight-year corporate income tax exemptions and import duty waivers for renewable energy projects promoted by the Board of Investment.
4. Net Billing Program (All Solar Owners)
Sell your excess solar electricity back to the grid at THB 2.20/kWh, locked in for 10 years through MEA or PEA. Note: both MEA and PEA have filled their ~90 MW purchasing quota as of late 2024, and new seller applications are frozen until the government expands the program.
A fifth program — the 1,500 MW Community Solar initiative — targets rural communities rather than individual homeowners, but it’s reshaping the broader market too.
Thailand’s residential rooftop solar market is expanding at a 10.25% CAGR, the fastest pace among all solar installation categories in the country (Krungsri Research, 2025). These incentives are the main driver. Let’s break each one down.
How Does the THB 200,000 Tax Deduction Work?
The personal income tax deduction of up to THB 200,000 is now enforceable law, published in the Royal Gazette on March 4, 2026 (Nation Thailand, 2026). It’s the single biggest incentive for Thai homeowners going solar, and it directly reduces your taxable income — not just your tax bill.
Who Qualifies?
- Non-juristic individuals (personal taxpayers, not companies)
- Must install an on-grid rooftop solar system (off-grid and hybrid systems don’t qualify)
- System capacity up to 10 kWp
- The deduction covers actual installation cost including VAT, capped at THB 200,000
- Valid for installations completed by December 31, 2028
What Does It Actually Save You?
The deduction reduces your taxable income, so your actual savings depend on your tax bracket. Here’s what that looks like at different income levels:
Consider what this means in practice: a homeowner in the 20% tax bracket who installs a 5 kWp system at THB 150,000 gets THB 30,000 back through the deduction — effectively a 20% discount on their entire installation. Pair that with electricity savings of THB 2,000-3,000 per month, and the system pays for itself even faster than the headline 4-5 year payback suggests.
How to Claim
- Install an on-grid rooftop solar system through a licensed installer
- Keep all receipts and the tax invoice (including VAT)
- File the deduction on your annual personal income tax return (PND.90 or PND.91)
- Attach proof of installation and payment
The deduction is claimed in the tax year the installation is completed and paid for. You can’t split it across multiple years.
Thailand’s THB 200,000 personal income tax deduction for residential solar installations was published in the Royal Gazette on March 4, 2026, making it enforceable law through December 31, 2028 (Nation Thailand, 2026). The deduction covers actual installation costs including VAT for on-grid rooftop systems up to 10 kWp.
What Is the 150% Business Tax Deduction?
Businesses investing in solar and energy-efficient equipment can claim a 150% tax deduction — meaning they deduct 1.5 times the actual cost from their taxable income (Solar Quarter, 2025). This is a more aggressive incentive than the residential program, and it applies to a broader range of equipment.
Eligibility
- Individual professionals, contractors, business owners, and juristic persons (companies)
- Equipment must carry a 5-star Energy Efficiency Label issued by DEDE or equivalent certification
- Equipment must be operational in Thailand by December 31, 2028
- Covers solar panels, inverters, battery storage, and other certified energy-saving equipment
How the 150% Deduction Works
If your business spends THB 1,000,000 on a qualifying solar installation, you deduct THB 1,500,000 from your taxable income. At the 20% corporate tax rate, that’s THB 300,000 in tax savings — versus THB 200,000 without the bonus deduction. The extra 50% effectively gives your business a 10% rebate on the entire investment.
What Equipment Qualifies?
DEDE maintains a list of certified equipment. The 5-star label requirement means you can’t just buy the cheapest panels available — they need to meet Thailand’s top efficiency standards. Solar panels, inverters, battery energy storage systems, and energy-efficient building materials all qualify, provided they carry the certification.
Have your installer confirm DEDE certification before purchasing. Using non-certified equipment means losing the entire bonus deduction.
Note: The 150% business deduction was approved by the Cabinet in June 2025. While it was included in the same Royal Gazette decree as the residential deduction, businesses should confirm specific equipment eligibility with the Revenue Department or DEDE.
Thailand’s 150% tax deduction allows businesses to deduct 1.5 times their actual investment in DEDE-certified energy equipment from taxable income, effectively providing a 10% rebate at the standard 20% corporate tax rate (Mahanakorn Partners, 2025). The program runs through December 2028.
How Do BOI Incentives Apply to Solar Projects?
The Board of Investment offers an 8-year corporate income tax exemption for qualifying renewable energy projects — the most valuable incentive available for large-scale solar in Thailand (Lex Nova Partners, 2025). This isn’t for homeowners putting panels on their roof. It’s for companies building solar farms, manufacturing solar equipment, or developing commercial solar infrastructure.
What You Get
- 8-year corporate income tax exemption (0% CIT for the first 8 years of operation)
- Import duty exemption on machinery and essential equipment
- Permission to own land for promoted activities
- Permission to bring in foreign experts and technicians
Who Qualifies?
BOI promotion targets specific business activities:
- Solar power generation (utility-scale and commercial)
- Solar cell and module manufacturing
- Energy storage system manufacturing
- Smart grid and energy management systems
The January 2026 BOI framework update refreshed these categories and expanded incentives for green technology investments (Alvarez & Marsal, 2026).
Thailand’s 8-year exemption is competitive regionally — only Malaysia offers a longer window. But Thailand’s additional benefits (import duty exemptions, land ownership rights) make the overall package attractive for foreign investors.
Application Process
BOI applications go through the One Start One Stop Investment Center (OSOS). Expect 60-90 days for approval. You’ll need a detailed project plan, financial projections, and evidence of technical capability. Working with a BOI advisor or law firm is standard practice for projects of this scale.
Thailand’s BOI provides an 8-year corporate income tax exemption for solar energy projects, plus import duty exemptions on machinery — one of the most competitive investment promotion packages in ASEAN (Lex Nova Partners, 2025). The January 2026 framework update expanded green technology categories.
What Is Thailand’s Net Billing Program?
The Energy Regulatory Commission (ERC) set the solar buyback rate at THB 2.20 per kWh in May 2022, up from the previous rate of THB 1.68/kWh, fixed for a 10-year period from your grid connection date (Nation Thailand, 2022). However, both MEA and PEA have filled their ~90 MW purchasing quota as of late 2024, and new seller applications are currently frozen until the government expands the program (Energy News Center, Dec 2024).
How Net Billing Works
When your solar panels generate more electricity than your home uses, the excess flows back to the grid. Your utility — MEA in Bangkok or PEA in the provinces — credits you at THB 2.20/kWh for that surplus. It’s not full net metering (where you’d get credited at the retail rate of ~3.88 baht/unit), but it’s a guaranteed income stream for a decade. Note: new enrollments are currently frozen — see quota status above.
Here’s what makes this significant: a household generating 500 kWh of excess solar per month earns THB 1,100/month or THB 13,200/year in grid credits. Over the 10-year lock-in period, that’s THB 132,000 — a significant offset against the cost of a 5 kWp system, before counting the electricity you use directly.
Why Not Full Net Metering?
A government-commissioned study concluded that Thailand isn’t ready for full net energy metering (NEM), where excess solar would be credited at the full retail electricity rate (Nation Thailand, 2025). The concern is grid stability and revenue impact on state utilities. So for now, net billing at THB 2.20/kWh is what’s available — though the quota is currently full.
How to Register
- Have your solar system installed by a licensed contractor
- Apply to MEA (Bangkok) or PEA (provinces) for grid connection
- Submit your net billing application through the same utility
- An inspector verifies your installation meets safety standards
- Once approved, your meter is replaced with a bi-directional meter
- Credits appear on your monthly electricity bill
The process typically takes 30-60 days after installation is complete.
Thailand’s ERC set the solar net billing buyback rate at THB 2.20 per kWh in May 2022, up from THB 1.68/kWh, fixed for 10 years from grid connection (Nation Thailand, 2022). The rate applies to residential and commercial rooftop systems registered through MEA or PEA. However, both MEA and PEA have filled their ~90 MW purchasing quota as of late 2024, and new applications are frozen (Energy News Center, Dec 2024).
What Is the 1,500 MW Community Solar Program?
Thailand’s National Energy Policy Council (NEPC) approved a 1,500 MW community solar framework in late 2025, targeting ground-mounted solar farms that supply electricity directly to local communities (Solar Quarter, 2025). This isn’t a program you apply for as a homeowner — it’s designed for energy businesses and cooperatives partnering with rural communities.
How It Works
- Ground-mounted solar farms up to 10 MW per site
- 25-year Power Purchase Agreements (PPAs) with MEA/PEA
- Electricity sold to local communities at a target price of THB 2.25/kWh plus grid service costs
- Selection is first-come, first-served based on project readiness and community cooperation
- Projects selected as Very Small Power Producers (VSPPs)
Why It Matters for Homeowners
Even if you’re not building a solar farm, the community solar program affects you. It’s adding 1,500 MW of solar capacity to the grid, which strengthens the case for continued government support of solar incentives. It also creates local jobs and brings solar infrastructure to areas where individual rooftop installations aren’t practical.
The ERC is targeting an electricity price below THB 2.25/kWh for participating communities (Nation Thailand, 2026) — significantly cheaper than the current retail rate of THB 3.88/kWh.
Note: The NEPC approved the community solar framework in October-December 2025. Project selection and PPA signing are ongoing in 2026. Check with ERC for the latest status on approved projects in your area.
Thailand’s NEPC approved a 1,500 MW community solar program with 25-year PPAs, targeting ground-mounted farms up to 10 MW per site that supply electricity to local communities at approximately THB 2.25/kWh (Solar Quarter, 2025). Selection is first-come, first-served.
How Much Can You Actually Save?
A typical Thai household installing a 5 kWp rooftop solar system at THB 150,000 can expect a payback period of 4-5 years, with the system reducing electricity bills by 50-70% (Bangkok Post, 2026). After payback, you’re generating essentially free electricity for the remaining 20+ years of the system’s lifespan.
Cost Breakdown
Here’s what a residential solar installation costs in 2026:
| System Size | Without Battery | With Battery (BESS) |
|---|---|---|
| 3 kWp | ~THB 90,000 | ~THB 200,000 |
| 5 kWp | ~THB 150,000 | ~THB 280,000 |
| 10 kWp | ~THB 350,000 | ~THB 500,000 |
Prices have been stable or slightly declining year-over-year. For most households, a system without battery storage makes sense — you use solar during the day and sell excess to the grid via net billing.
Stacking Incentives
Can you combine these programs? Yes — and you should:
- Install a 5 kWp system for ~THB 150,000
- Claim the tax deduction of THB 150,000 from your taxable income (saving THB 30,000 at the 20% bracket)
- Register for net billing to earn THB 2.20/kWh on excess power (note: new applications are currently paused due to quota limits)
- Reduce your monthly bill by 50-70%
Your effective cost after the tax deduction: THB 120,000. With monthly savings of THB 2,000-3,000 plus net billing credits, payback drops to roughly 3-4 years.
What most guides miss: the real value isn’t just the payback period. A 5 kWp system with a 25-year warranty generates roughly THB 3.75 million in electricity value over its lifetime at current rates — on a THB 150,000 investment. Even accounting for panel degradation (about 0.5% per year) and maintenance, the return dwarfs any fixed deposit or bond.
Thai homeowners installing a 5 kWp solar system at THB 150,000 can expect a 4-5 year payback period, with electricity bill reductions of 50-70% and net billing credits of THB 2.20/kWh on excess generation (Bangkok Post, 2026). After payback, savings continue for the system’s 25-year lifespan.
How to Apply for Solar Subsidies: Step by Step
Ready to claim your incentives? Here’s what to do first: get three quotes from licensed solar installers and confirm the systems they propose are on-grid and DEDE-certified. Everything else flows from that starting point.
Step 1: Choose Your System (Week 1)
Contact 2-3 licensed installers for quotes. Specify that you need an on-grid system (required for both the tax deduction and net billing). Ask each installer to confirm their equipment carries DEDE certification. A 5 kWp system suits most households with monthly bills above THB 3,000.
Step 2: Install and Document (Weeks 2-4)
Once you’ve selected an installer, the physical installation typically takes 1-3 days. Keep every receipt, tax invoice, and the installation completion certificate. You’ll need these for your tax return and your net billing application.
Step 3: Register for Net Billing (Weeks 4-8)
Apply to your local utility (MEA or PEA) for grid connection and net billing. The utility will inspect your installation, verify it meets safety standards, and install a bi-directional meter. This process takes 30-60 days.
Note: Net billing applications are currently frozen (90 MW quota full since late 2024). You can still register your system with MEA/PEA for grid connection and self-consumption. When the expanded ~400 MW/year quota opens, registered systems will be first in line.
Step 4: Claim Your Tax Deduction (Annual Tax Filing)
When you file your annual personal income tax (PND.90 or PND.91), include the solar installation cost as a deduction — up to THB 200,000 including VAT. Attach your receipts and the installation certificate.
Don’t wait until the last minute. The December 2028 deadline applies to when the installation is completed, not when you file taxes.
Frequently Asked Questions
Can foreigners claim the THB 200,000 solar tax deduction in Thailand?
Yes, if you file Thai personal income tax as a non-juristic individual. The deduction is based on tax residency, not nationality. You need to own the property (or have the owner’s consent) and install an on-grid system up to 10 kWp. Around 100,000 residential solar installations were recorded across Thailand as of 2024 (Krungsri Research, 2025).
Do I need permits to install rooftop solar in Thailand?
Yes, but the process has been simplified. Systems under 200 kWp on existing buildings no longer require a construction permit — you just need to notify your local authority. Grid connection requires approval from MEA or PEA. Your installer should handle both.
How long does the BOI application process take?
Typically 60-90 days from submission to approval. You’ll need a detailed project plan, financial projections, and proof of technical capability. Most applicants work with a BOI consultant or law firm. The 8-year CIT exemption starts from the date revenue is first earned.
Can I combine multiple solar incentives?
Yes. Homeowners can stack the THB 200,000 tax deduction with net billing — they’re administered by different agencies (Revenue Department and ERC). Businesses can potentially combine the 150% tax deduction with BOI incentives, though BOI-promoted projects have their own tax framework. Consult a tax advisor for your specific situation.
What happens to excess solar power I generate?
Under net billing, your utility (MEA or PEA) buys excess power at THB 2.20/kWh, credited to your bill. The rate is locked for 10 years from your connection date. If your credits exceed your bill, the surplus carries forward — you don’t get a cash payout, but you won’t lose the credits either. Note: both MEA and PEA have filled their ~90 MW purchasing quota as of late 2024, so new seller applications are frozen until the program is expanded.
Conclusion
Thailand’s solar incentive landscape in 2026 is the most favorable it’s ever been. The THB 200,000 tax deduction is now law, net billing pays THB 2.20/kWh for excess generation (quota currently frozen — expansion expected under new PDP), and the BOI continues to offer some of ASEAN’s most competitive investment terms for renewable energy projects.
Key takeaways:
- Homeowners: Claim up to THB 200,000 in tax deductions and earn THB 2.20/kWh on excess solar (quota currently full — watch for program expansion) — payback in 4-5 years when stacked
- Businesses: The 150% tax deduction on DEDE-certified equipment is effectively a 10% rebate at the 20% CIT rate
- Investors: BOI’s 8-year CIT exemption plus import duty waivers make Thailand competitive with Malaysia and the Philippines for solar manufacturing
- Communities: The 1,500 MW community solar program brings cheap electricity to rural areas at ~THB 2.25/kWh
The December 2028 deadline for the tax deductions gives you time, but solar panel prices and installation demand both tend to spike as deadlines approach. Getting your system installed sooner means more years of savings.