Benefits
- More Cost Saving
Reduce long-term electricity costs and enhance financial liquidity. - More Convenience
ttb offers an investment financing with a full-service solution, including professional partners, permitting and installation process. - More Confidence
With a letter of guarantee from the provider and ttb will support operating and maintenance costs during the Loan's term. - Credit limit up to 100% of the solar rooftop investment.
Preliminary installation size & investment value
| Preliminary installation cost estimate | |||||
|---|---|---|---|---|---|
| Electricity cost before installation/month (baht) | 50,000 | 100,000 | 500,000 | ||
| Estimated investment value (baht) | 1,800,000 | 3,500,000 | 14,000,000 | ||
| Estimated savings on electricity /month (baht) | 25,000 | 50,000 | 250,000 | ||
| Estimated installment/month (baht) [calculate from MRR*-1.5%] | 23,800 | 46,200 | 184,600 | ||
| Estimated savings after repayment/month (baht) | 1,200 | 3,800 | 65,400 | ||
Example of savings, in case of the electricity cost before installation is approximately 50,000 baht
| Example of savings, in case of the electricity cost before installation is approximately 50,000 baht | ||||
|---|---|---|---|---|
| Example | Electricity cost before installation (baht) | Estimated savings on electricity (baht)) | Repayment/month (baht) | Savings/ month (baht) |
| 1st – 8th Year | 50,000 | 25,000 | 23,800 | 1,200 |
| 9th – 25th Year | 50,000 | 25,000 | 0 | 25,000 |
Note :
- The figures shown above are for illustrative purposes only and do not include maintenance costs throughout the loan tenor.
- The interest rate is based on MRR = 7.305% per annum (effective as of August 15, 2025).
- For cases where the estimated pre-installation electricity cost exceeds THB 500,000, please contact us for more information.
Conditions
- Juristic persons.
- Thai business owners aged between 20 and 65 years at the time of application.
- The business must be registered and operating in Thailand for at least two years.
- Applicants must have a good repayment history, with no record of financial litigation or bankruptcy.
Frequently Asked Questions about ttb solar rooftop solution
How much can a solar rooftop system reduce business electricity costs?
Typically, a solar rooftop system can reduce electricity costs by approximately 40–50%, depending on energy usage patterns and system size.
What is the maximum loan amount for installing a solar rooftop system?
Businesses can apply for financing of up to 100% of the total investment value, subject to the bank’s terms and approval criteria.
Is investing in a solar rooftop system worthwhile for businesses?
Installing a solar rooftop system can help reduce long-term energy costs, with an estimated payback period of approximately 4–5 years, compared with an expected system lifespan of approximately 20–25 years. The actual payback period may vary depending on the system size, electricity consumption patterns, and the amount of electricity generated. In addition, businesses can convert electricity expenses into investment repayments, enabling more effective cash flow management.*
*Note: The payback period and system lifespan are estimates only and may vary depending on the system size and quality, electricity consumption patterns, site conditions, and other relevant factors.
What types of businesses are suitable for solar rooftop installation?
Solar rooftop systems are suitable for businesses with high electricity consumption, such as factories, warehouses, hotels, and office buildings, as well as those aiming to reduce costs and enhance sustainability.
Can the investment be used for corporate income tax benefits?
Businesses may utilize the investment for tax benefits, such as :
- Up to 1.5x tax-deductible expenses
- Potential corporate income tax exemption of up to 50% of the investment value
*Subject to government regulations and eligibility criteria.
Is prior knowledge of solar installation required?
No. Expert partners provide end-to-end support, including site assessment, system design, installation, and maintenance.
Document Required
- Company certificate issued by the Department of Business Development, Ministry of Commerce, and a shareholder list (no more than 3 months)
- A copy of the Company’s Memorandum of Association and a copy of the Company Limited’s Registration
- Copies of Identification card and copies of the house registration of the authorized director and shareholders of over 50%
- Latest financial statement which is audited by a licensed auditor
- Copies of income documents such as bank statement / Por. Por. 30 in the past 6 months
- Copies of documents evidencing ownership rights to property such as title deed / Nor Sor 3 Kor
- A copy of Business License (if any)
- A sales-purchase quotation / Contract
Additional information
