Final Call for BOI Solar Projects in Thailand Before June 30, 2025
If you are planning to invest in a solar power system in Thailand and hope to receive BOI incentives, this is the moment you should not miss. The Board of Investment (BOI) has announced a major change in its promotion policy for renewable energy projects. Projects that involve only solar power generation will no longer be eligible for investment promotion after June 30, 2025. There will be no extensions and no exceptions under the old criteria once this deadline passes.
This announcement marks a turning point for businesses, factories, and project owners who have been considering solar installations but have not yet submitted their applications. If your project is still in the planning stage, you need to move fast. What matters is the date your application is officially accepted and assigned a BOI reference number, not the date you start construction. Once the deadline passes, solar-only projects will fall under the new rules and will no longer qualify for BOI support.
What Has Changed in the New BOI Policy?
According to the latest BOI announcement, the investment promotion for projects that install solar power generation alone under the previous scheme has been discontinued. Moving forward, BOI will shift its focus to supporting other forms of renewable energy development, particularly projects that integrate Battery Energy Storage Systems (BESS).
The policy direction reflects Thailand’s broader energy strategy. Solar power has become more common and accessible, while energy storage is increasingly important for grid stability, peak demand management, and energy security. In short, BOI now wants to encourage solutions that go beyond electricity generation and move toward smarter energy systems.
Key Questions and Answers from BOI
Based on direct clarification from BOI officers, here is a practical summary of what project owners should know:
Until when can projects apply under the old solar promotion scheme? Applications can be submitted under the existing criteria until June 30, 2025. The decisive factor is the date the BOI issues your application number. If your project is registered by that date, it will still be considered under the old rules.
What about solar projects combined with battery storage (BESS)? If your project includes both solar power and a battery energy storage system, and you submit your application before June 30, 2025, it can still receive promotion under the current framework. From July 1, 2025 onwards, the new policy will apply. BOI will no longer promote solar-only projects and will focus more on systems that include energy storage or other renewable technologies.
What does the “THB 12 million per megawatt” rule for BESS mean? BOI will calculate eligible investment for tax incentives based on the battery system component only, capped at THB 12 million per 1 megawatt of power capacity. BOI will then grant tax incentives on 50% of the eligible investment amount.
Example: If you invest THB 15 million in a BESS for 1 MW of capacity:
BOI will consider only THB 12 million as eligible investment.
The tax incentive will be calculated on 50% of that amount, equal to THB 6 million.
This approach encourages reasonable system sizing and helps ensure that incentives are tied to practical, scalable energy storage investments.
Why This Deadline Matters for Businesses
For factories and commercial buildings, BOI incentives can significantly improve project returns. Tax exemptions and investment privileges often shorten payback periods and reduce overall project risk. Missing the June 30, 2025 deadline could mean losing access to these benefits entirely for solar-only projects.
Many companies delay decisions while waiting for internal approvals or budget cycles. However, BOI’s timeline is firm. If solar energy is already part of your sustainability or cost-saving plan, acting now could mean the difference between receiving incentives and paying full investment costs.
Final Reminder
If you want to secure BOI incentives for your solar project under the existing scheme, your application must be submitted and officially accepted by June 30, 2025. After this date, BOI will no longer promote standalone solar installations.
Solar PPM offers support in preparing and submitting BOI applications at no cost, helping project owners meet the deadline and navigate the process smoothly. This is the final window under the current BOI framework—once it closes, it will not reopen.
If solar is part of your business strategy, now is the time to move from planning to action.
