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Thailand's new electricity rate for September-December 2026 has been announced: the average electricity rate remains at 3.95 baht per unit, excluding VAT.
At first glance, this sounds like good news. In the short term, it is. The rate has not increased from the previous cycle. But the more important question is this: is the rate stable because energy costs have truly settled, or because a specific mechanism is helping hold the number in place?
The answer is the second one.
This article explains, in plain language, what the September-December 2026 electricity rate means, what the Ft charge and clawback mechanism are, why electricity costs may still change in the future, and how solar can help homeowners reduce their exposure to energy costs they cannot control.
What Is the Electricity Rate for September-December 2026?
On July 22, 2026, Thailand's Energy Regulatory Commission approved the Ft charge for September-December 2026 at 16.23 satang per unit. When combined with the base tariff of 3.78 baht per unit, the average electricity rate becomes 3.95 baht per unit, excluding VAT.
In simple terms, the electricity rate for this cycle has not increased from the previous period. For homeowners who follow the tariff every four months, this number helps with short-term household cost planning.
However, 3.95 baht per unit is the announced average rate. It is not the exact final amount every home will see on its bill. The actual bill still depends on total units used, customer type, service charges, and VAT.
So if the question is, "Is the electricity rate really stable?" the answer is yes, in terms of the announced average rate for this cycle. But that does not mean every household bill will stay the same. If a home uses more electricity in a given month, especially from air conditioning, water pumps, swimming pools, freezers, or other high-load equipment, the final bill can still increase.
What Is the Ft Charge, and Why Does It Change Every Four Months?
The electricity bill we pay is not built from one single number. It has two main parts.
The base tariff is the basic electricity rate that covers the core cost of generating, transmitting, and distributing electricity. This part does not change frequently.
The Ft charge is a variable electricity cost that reflects changes in fuel and power purchasing costs. This includes natural gas prices, global fuel prices, exchange rates, and other costs related to electricity generation.
Because these costs change over time, the Ft charge is reviewed in cycles, generally every four months. This is why many households feel that electricity costs move up and down even when their own usage habits have not changed much.
For the September-December 2026 cycle, the important point is that even though the average rate remains at 3.95 baht per unit, the estimated fuel and power purchasing costs have not disappeared from the system.
Why Is the Rate "Stable" This Time?
For this cycle, the Energy Regulatory Commission used a mechanism known as clawback to help reduce the burden on electricity users.
Clawback means bringing back a surplus or adjustment from previous periods to reduce the electricity burden in the current period, instead of passing the full impact of higher costs to users immediately.
Reports based on the ERC decision stated that around 16,127.17 million baht in clawback funds, equivalent to 25.04 satang per unit, was used to help reduce the Ft charge to 16.23 satang per unit. At the same time, EGAT still carries part of the accumulated cost burden on behalf of electricity users.
In plain terms: the rate is stable this cycle, but that stability comes from a system-level adjustment. It is not a signal that electricity rates will remain stable forever.
This is why homeowners should look beyond the simple question of whether the rate goes up or down. Many factors remain outside a household's control, including global energy prices, exchange rates, government policy, and accumulated energy costs in the electricity system.
What Can Homeowners Actually Control?
Homeowners cannot control the Ft charge.
Homeowners cannot control natural gas prices.
Homeowners cannot control the next electricity tariff decision.
But homeowners can control how much electricity their home needs to buy from the grid.
This is why solar is a long-term planning decision, not only a reaction to one electricity rate announcement. The more a home can produce and use its own electricity at the right time, the less electricity it needs to buy from the grid. When the Ft charge changes in the future, the impact on that home may become smaller.
The key idea is simple: a well-planned home does not wait for electricity prices to stay stable. It reduces its dependence on that instability.
How Does Solar Help Reduce Electricity Bills?
Solar rooftop systems reduce electricity bills through a simple principle: they generate electricity from sunlight and use that electricity inside the home first. The more solar power the home can use directly, the less electricity it needs to buy from the utility grid.
For example, if a home produces and uses 100 units of solar electricity in a cycle where the average electricity rate is 3.95 baht per unit, it can reduce grid electricity purchases by around 395 baht before VAT and before other bill structure details are considered.
That may not sound dramatic when looking at only 100 units. But for homes with high daytime electricity use, such as homes with people at home during the day, home offices, villas that run air conditioning and water pumps often, homes with swimming pools, or projects with continuous daytime loads, solar can meaningfully reduce grid electricity use throughout the system's life.
However, solar does not reduce electricity bills equally for every home. The result depends mainly on three factors:
1. Does the home use significant electricity while the panels are generating power?
2. Is the system size matched to the home's real usage pattern?
3. Is there a good energy management approach?
If a home installs a large system but uses very little electricity during the day, part of the generated electricity may become surplus power exported back to the grid. That surplus may be valued lower than electricity used directly inside the home. In other words, installing a bigger system does not always mean better value.
Does Solar Help With the Ft Charge?
Solar does not directly remove the Ft charge from the bill.
But solar can reduce the number of grid electricity units a home purchases. When the home buys fewer units, the Ft charge applied to purchased units affects the home less.
This distinction matters. Solar does not change the country's electricity tariff. It helps the home increase the share of energy it can control.
For homeowners thinking long term, this matters more than one tariff cycle. The Ft charge can change every four months, but a well-designed solar system can reduce grid dependence year after year.
Can Homeowners Sell Electricity Back to the Grid?
In 2026, PEA announced that applications for the public solar rooftop program opened on July 1, 2026. Key details included an overall purchase target of up to 500 MW, a maximum offer of 5 kW per meter, a purchase rate of 2.20 baht per unit, and a 10-year power purchase agreement under the program conditions.
For homes in the Metropolitan Electricity Authority service area, homeowners should check MEA's own conditions and channels. Most homes in Southern Thailand are generally under PEA.
That said, selling surplus electricity should be viewed as an additional benefit, not the main reason for installing solar for most homes. The reason is straightforward: using solar electricity inside the home usually creates more value than selling surplus electricity back, because self-consumption directly reduces electricity purchases at the household tariff rate.
The better approach is to design the system so the home can use as much solar electricity as possible first, then consider surplus export based on the right conditions.
How Many kW Should a Home Install?
This is the question many people want answered first. In reality, it should not be answered from the monthly electricity bill alone.
PEA has provided broad guidance that a 3 kW system may suit a home with moderate daytime electricity use, while a 5 kW system may suit a home with higher usage or multiple electrical appliances. But the right system size still depends on each home's specific situation.
Two homes with the same 5,000 baht monthly electricity bill may need different system sizes if one uses most of its electricity during the day and the other uses most of it at night.
Before selecting system size, homeowners should review at least:
- Electricity bills from the past 6-12 months
- The time of day when electricity use is highest
- High-load equipment, such as air conditioning, water pumps, swimming pools, freezers, and water heaters
- Roof direction, installation area, and shading
- The main goal of installation, such as bill reduction, surplus export, or backup power
- Future plans for battery storage or hybrid solar
A good system should not start with "How many kW?" It should start with "How does this home use electricity?"
What Types of Homes Benefit Most Clearly From Solar?
Solar is often a strong fit for homes and projects whose electricity use aligns with solar production hours, such as:
- Homes with people at home during the day
- Work-from-home residences
- Villas or holiday homes that run air conditioning during the day
- Homes with swimming pools, water pumps, or irrigation systems
- Home offices or small businesses operated from the property
- Shops, cafes, showrooms, or offices that use electricity during the day
- Projects looking to reduce long-term energy costs
If a home uses most of its electricity only at night, an on-grid solar system alone may reduce the bill less than expected unless it is designed with battery storage or proper energy management.
This does not mean night-heavy homes should not consider solar. It means they need a more carefully designed solution.
Is Battery Storage Necessary?
Battery storage is not necessary for every home.
If the main goal is bill reduction and the home uses a lot of electricity during the day, an on-grid system may work well and have a lower initial cost.
But if the home needs backup power during outages, has high nighttime electricity use, or wants more flexible energy management, a hybrid solar system with battery storage may be more suitable. This is especially relevant for some homes in Southern Thailand, where heavy rain, thunderstorms, and occasional outages can be part of daily life in certain seasons.
The important point is that battery storage should be designed around the loads that need backup. It should not be selected simply because the capacity looks large. A home does not need to back up every device at the same time. Essential backup loads may include selected lighting, Wi-Fi, security systems, refrigerators, electric gates, or other critical equipment.
How Does Energy Management Make Solar More Valuable?
A good solar system does not end with panels and an inverter.
For modern homes, especially those with smart home systems or multiple electrical zones, an Energy Management Solution helps homeowners see important information: how much electricity the panels are producing, how much the home is using, how much is being drawn from the grid, and whether there is surplus energy available.
Once this information is visible, the system can manage energy more intelligently. For example:
- Schedule water pumps or selected equipment to operate when solar production is high
- Set air conditioning scenes that respond to available solar energy
- Reduce unnecessary loads when the home needs to draw power from the grid
- Review real usage patterns to adjust system planning in the future
- Manage battery use based on time, need, and available energy
This is where solar becomes part of smart living, not just panels on the roof. When energy is connected to the home's wider system, the home can use electricity more intentionally without requiring the homeowner to manage every detail manually.
Are There Tax Benefits for Solar?
Thailand's Ministry of Energy has communicated tax measures allowing individuals to deduct actual expenses for installing rooftop solar power generation systems at home, up to 200,000 baht, under the stated conditions. The system must be on-grid and connected to the utility, and full e-Tax Invoice documentation is required.
Measures like this can make solar planning more attractive. However, homeowners should always confirm the latest conditions with the relevant authorities or a tax professional before making a decision, because eligibility depends on applicant qualifications, timing, documents, and the specific terms of the measure.
What Should Homeowners Ask Before Installing Solar?
Before deciding on a solar system, homeowners should ask the provider these questions:
Will you assess real electricity usage patterns?
If a system is designed only from an average electricity bill, it may not match the home's actual usage hours.
How carefully will you assess the roof and shading?
Roof direction, tilt, available area, and shadows from trees or nearby buildings affect real production.
Is the system designed for self-consumption or surplus export?
These two goals are not the same and can produce different financial results.
Can the system support battery storage or hybrid solar in the future?
If backup power may be needed later, it is better to plan for that from the beginning.
Is there an Energy Management Solution or usage monitoring system?
Seeing real data helps homeowners adjust usage and get more value from solar.
Who supports the system after installation?
Solar is a long-term system. Installation quality, testing, maintenance, and after-sales support matter as much as the equipment itself.
FAQ
What is Thailand's electricity rate for September-December 2026?
The average electricity rate for September-December 2026 is 3.95 baht per unit, excluding VAT. The Ft charge for this cycle is 16.23 satang per unit.
Does the 3.95 baht rate include VAT?
No. The 3.95 baht per unit rate excludes VAT. The final bill also includes other details such as electricity units used, service charges, and VAT.
Does this stable rate mean electricity will not increase again?
No. The rate remains stable this cycle because of the clawback mechanism, but the Ft charge still depends on fuel costs, global energy prices, and other factors that may change in the future.
Does solar really help reduce electricity bills?
Yes, if the system is designed around the home's real usage pattern. Solar is especially effective for homes that use significant electricity during the day.
Will installing solar make the electricity bill zero?
In most cases, homeowners should not expect the electricity bill to be zero every month. Solar panels do not produce electricity at night, production drops during heavy rain or cloudy weather, and some periods may require more electricity than the system can generate.
Can homeowners sell surplus electricity back to the grid?
Yes, if the home meets the conditions of the utility's power purchase program, such as PEA or MEA requirements. The homeowner must apply and follow the relevant rules.
If a home uses most electricity at night, should it still consider solar?
Yes, but it should consider hybrid solar or battery storage, and the system should be designed after reviewing actual usage patterns. An on-grid system alone may reduce the bill less than expected for homes with heavy nighttime use.
Conclusion
The September-December 2026 electricity rate truly remains at 3.95 baht per unit, but that stability comes from tariff management mechanisms. It is not a guarantee that electricity rates will remain stable forever. The Ft charge can still change every four months based on energy costs and external factors.
What homeowners can control more directly is the amount of electricity they need to buy from the grid. A solar system designed around real usage patterns, supported by Energy Management and battery storage where appropriate, can help a home use energy more intelligently and reduce long-term dependence on external price movements.
A good solar system is not about installing the most panels possible. It is about designing a home energy system that works intelligently in real life.