The Provincial Electricity Authority has opened applications for its 2026 household solar rooftop power purchase scheme, allowing homeowners to sell surplus electricity back to the grid at 2.20 baht per kWh.

The Provincial Electricity Authority (PEA) has announced full support for clean energy and officially opened applications for the 2026 Solar Rooftop Power Purchase Scheme for Households from July 1, 2026.

The scheme gives homeowners the opportunity to generate electricity for their own use and sell surplus power back to the grid, creating long-term supplementary income.

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PEA launches 2026 household solar rooftop scheme at 2.20...

The Provincial Electricity Authority has opened applications for its 2026 household solar rooftop power purchase scheme, allowing homeowners to sell surplus electricity back to the grid at 2.20 baht p

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• Power purchase rate: 2.20 baht per unit, or kWh

• Contract period: 10 years from the scheduled commercial operation date, or SCOD

• Electricity sale quota: No more than 5kW AC per meter/applicant

• Total project target: No more than 500MW AC, jointly managed by PEA and MEA

• Application basis: First come, first served

• SCOD deadline: Within 2027

2,000THB inspection fee.

That means selling back 909Kw back to the PEA, before becoming profitable. Around 6 months when capped at 5Kw per day.

Looks like it will be open for 100,000 homes.

1 hour ago, Packer said:

• Power purchase rate: 2.20 baht per unit, or kWh

• Contract period: 10 years from the scheduled commercial operation date, or SCOD

• Electricity sale quota: No more than 5kW AC per meter/applicant

• Total project target: No more than 500MW AC, jointly managed by PEA and MEA

• Application basis: First come, first served

• SCOD deadline: Within 2027

2,000THB inspection fee.

That means selling back 909Kw back to the PEA, before becoming profitable. Around 6 months when capped at 5Kw per day.

Looks like it will be open for 100,000 homes.

You are mixing up your kW and your kWh. Your export to the grid is limited at 5 kW, not 5kWh per day. If you have a large system, you can probably export 20-30 kWh on a reasonably sunny day.

1 hour ago, Packer said:

2,000THB inspection fee.

That means selling back 909Kw back to the PEA, before becoming profitable. Around 6 months when capped at 5Kw per day.

that is only partially correct ...

what you're not taking into account are eg. the costs of an electrical schema plan by a certified electrical engineer, as well as, in the case of a rooftop installation, the structural calculations and certification by a structural engineer! in addition, there may are the extra costs for PEA/MEA-required equipment and prescribed material lists ... and so on!

8 minutes ago, Sophon said:

You are mixing up your kW and your kWh. Your export to the grid is limited at 5 kW, not 5kWh per day. If you have a large system, you can probably export 20-30 kWh on a reasonably sunny day.

it is limited to 5 kwp per meter (single phase). if you want to export 30 kwh on a sunny day, you would probably have to switch off all the electrical loads in your house, which doesn't seem like a practical solution ... 😅

14 minutes ago, Sophon said:

You are mixing up your kW and your kWh. Your export to the grid is limited at 5 kW, not 5kWh per day. If you have a large system, you can probably export 20-30 kWh on a reasonably sunny day.

That's good. 🙂

2 hours ago, Packer said:

2,000THB inspection fee.

That means selling back 909Kw back to the PEA, before becoming profitable. Around 6 months when capped at 5Kw per day.

Looks like it will be open for 100,000 homes.

It's as if they don't really want the 'scheme' to succeed 😋

these are the latest documents from PEA ... after reading them, i've lost interest in rooftop solar ... 😂

https://ppim.pea.co.th/app/v1/project/solar/detail/6a3df059ee9f0e286c0a1766

1 hour ago, motdaeng said:

in the case of a rooftop installation, the structural calculations and certification by a structural engineer! in addition, there may are the extra costs for PEA/MEA-required equipment and prescribed material lists ... and so on!

Anybody that used a proper company has all this already. Signed and stamped in their package document folder.

1 hour ago, motdaeng said:

it is limited to 5 kwp per meter (single phase). if you want to export 30 kwh on a sunny day, you would probably have to switch off all the electrical loads in your house, which doesn't seem like a practical solution ... 😅

I disagree. Solar panels are getting quite cheap, so many people install more panels than are strictly needed to account for overcast days. With 12-15 kW of panels a sunny day would give you 5-6 hours of maximum export, while still leaving you 4-5 kW to cover the house load.

10 minutes ago, Sophon said:

I disagree. Solar panels are getting quite cheap, so many people install more panels than are strictly needed to account for overcast days. With 12-15 kW of panels a sunny day would give you 5-6 hours of maximum export, while still leaving you 4-5 kW to cover the house load.

you are correct ...

but that would mean oversizing your solar system by 4–5 kWp (+ around 10 panels, requiring about 30 m² of roof space), plus adding a separate (?) PEA string inverter, just to receive an extra 2.2 baht per unit, limited to 10 years. i'm not sure who would consider that worthwhile ...

Edited July 3Jul 3 by motdaeng

1 hour ago, motdaeng said:

requiring about 30 m² of roof space)

Just how small is your roof ?

It seems quite a tiny incentive to go through the hassle of getting your system certified and buy the required inverters from their list. It would take years to break even and then you make 1-3k baht a month. I'll take a pass on this PEA incentive :)

1 hour ago, atpeace said:

buy the required inverters from their list.

Your installer installed an inverter that's not on the PEA list ??

11 minutes ago, Packer said:

Your installer installed an inverter that's not on the PEA list ??

11 minutes ago, Packer said:

Yes

Sounds good until :

«The solar system must be installed on the roof, rooftop deck or another part of a residential building currently in use. Ground-mounted systems are not included. Applicants must cover the full cost of installing the system themselves.»

51 minutes ago, atpeace said:

Yes

I'd ask Why on Earth did you allow the installer to do that?

But that would be off topic.

9 hours ago, Packer said:

I'd ask Why on Earth did you allow the installer to do that?

But that wou

I like to do my own thing and not be told by a government official how to do it. I bought all my components myself and installed many of them myself. I can add panels and change the system on the fly without getting approval. I know of nobody that installed their system and didn't make major changes in the next 5 years.

I have now 10 KW of panels with 14KW storage and it cost me ~145k all in. Not bad:) THat same system going the traditional route would cost ~400k but wait - I would get 2.2 baht per unit sent back to PEA -555. On a good day, I could buy a large Chang at the local bar with my proceeds.

Every now and then smoke comes from certain components and it always smells like glue is burning on the patio but other than that it has been a success :)

Here are few other strong arguments why not to go down the export route that were supplied by AI. Maybe it is just me but 2.2 baht and all the rules and regs. I've got better things to do than go through this hassle for 2.2 baht :) Messy....and if you are like all the people I know with large solar setups, upgrades are inevitable.

V V V V

If you legally register your system to sell power back under the 2026 household solar scheme, you are locking yourself into a rigid, legally binding contract. Making major modifications afterward changes the game completely.

Here is exactly what happens if you update an officially approved system:

1. The Inverter Swap Triggers a System Redo

If you change your inverter (whether it’s a replacement or an upgrade to handle more load), you cannot just swap it out. Because PEA’s contract is tied directly to the safety parameters and specific model numbers of their Approved Inverter List, a change requires a formal amendment application.

• The Catch: Your new inverter must be on the current approved list. If you buy an unapproved or hybrid inverter that doesn't strictly meet their anti-islanding or grid-tie specifications, they will reject it.

2. Adding Panels Triggers a Re-Inspection

If you expand your capacity (e.g., adding more kWp of panels to the roof), you are changing the total generation capability stated in your initial Power Purchase Agreement (PPA).

• The Process: You must file for a system expansion. This requires submitting updated single-line electrical diagrams stamped by a licensed electrical engineer.

• The Inspection: Yes, PEA will schedule another physical site inspection. An officer will come out to verify that the new panel layout matches the new diagrams, ensure the grounding and surge protections are still up to code, and confirm the system won't overload the local grid feeder.

3. The Local Feeder Bottleneck

This is the hidden trap that trips up homeowners who try to expand later. PEA limits how much solar power can be fed back into any single local transformer district to prevent grid instability. If you try to upgrade your system size a year or two down the line, you might find that your neighbors have taken up the remaining transformer capacity. PEA can—and will—reject your expansion request simply because the local grid can no longer accept the extra power.

The Reality Check: You are entirely right that it isn't worth the hassle for 2.2 baht per kWh. For a residential setup, the administrative friction, the engineering fees for re-stamping diagrams, and the restriction of being chained to PEA-approved hardware usually wipe out whatever pocket change you make selling excess power.

Most people upgrading their systems mid-stream are doing it purely for self-consumption—adding a larger hybrid inverter and battery storage to cut their own bill. If you run a high-quality system with a smart zero-export limiter, you keep total control over your hardware choices and avoid the PEA inspection loop entirely.

28 minutes ago, atpeace said:

Here are few other strong arguments why not to go down the export route that were supplied by AI. Maybe it is just me but 2.2 baht and all the rules and regs. I've got better things to do than go through this hassle for 2.2 baht :) Messy....and if you are like all the people I know with large solar setups, upgrades are inevitable.

V V V V

If you legally register your system to sell power back under the 2026 household solar scheme, you are locking yourself into a rigid, legally binding contract. Making major modifications afterward changes the game completely.

Here is exactly what happens if you update an officially approved system:

1. The Inverter Swap Triggers a System Redo

If you change your inverter (whether it’s a replacement or an upgrade to handle more load), you cannot just swap it out. Because PEA’s contract is tied directly to the safety parameters and specific model numbers of their Approved Inverter List, a change requires a formal amendment application.

• The Catch: Your new inverter must be on the current approved list. If you buy an unapproved or hybrid inverter that doesn't strictly meet their anti-islanding or grid-tie specifications, they will reject it.

2. Adding Panels Triggers a Re-Inspection

If you expand your capacity (e.g., adding more kWp of panels to the roof), you are changing the total generation capability stated in your initial Power Purchase Agreement (PPA).

• The Process: You must file for a system expansion. This requires submitting updated single-line electrical diagrams stamped by a licensed electrical engineer.

• The Inspection: Yes, PEA will schedule another physical site inspection. An officer will come out to verify that the new panel layout matches the new diagrams, ensure the grounding and surge protections are still up to code, and confirm the system won't overload the local grid feeder.

3. The Local Feeder Bottleneck

This is the hidden trap that trips up homeowners who try to expand later. PEA limits how much solar power can be fed back into any single local transformer district to prevent grid instability. If you try to upgrade your system size a year or two down the line, you might find that your neighbors have taken up the remaining transformer capacity. PEA can—and will—reject your expansion request simply because the local grid can no longer accept the extra power.

Most people upgrading their systems mid-stream are doing it purely for self-consumption—adding a larger hybrid inverter and battery storage to cut their own bill. If you run a high-quality system with a smart zero-export limiter, you keep total control over your hardware choices and avoid the PEA inspection loop entirely.

And they make you install the most expensive equipment.

My DIY inverter cost 6,700bht ........ the one they would authorise cast 20,000bht.

Same specs, same functions.

Edited July 4Jul 4 by BritManToo

17 hours ago, motdaeng said:

you are correct ...

but that would mean oversizing your solar system by 4–5 kWp (+ around 10 panels, requiring about 30 m² of roof space), plus adding a separate (?) PEA string inverter, just to receive an extra 2.2 baht per unit, limited to 10 years. i'm not sure who would consider that worthwhile ...

A couple of things you are missing:

You wouldn't oversize your system "just to receive an extra 2.2 baht per unit", you would oversize it to make sure you had enough capacity on cloudy days, which would then result in you having excess capacity on sunny days. Might as well get some benefit from that excess capacity.

Registering for export doesn't only have the benefit of getting paid for excess capacity, it also means that you can use the grid as an extra "battery". You can export excess on sunny days, and import on cloudy days, which means that you might be able to get by with less actual battery capacity than what would otherwise be needed (therefore saving you money). Sure, that argument would work better, if you actually got the same buy-in rate as you pay when you use the grid, but the argument still holds true.

So in short.

Those that have a properly installed system, installed correctly. It's perfect.

Those that did a half-assed job installing it, need to modify it because they didn't do it properly the first time, didn't use use proper professional installers etc, it's not for them and their half-ass half-assed installed system.

🙂

3 minutes ago, Packer said:

So in short.

Those that have a properly installed system, installed correctly. It's perfect.

Those that did a half-assed job installing it, need to modify it because they didn't do it properly the first time, didn't use use proper professional installers etc, it's not for them and their half-ass half-assed installed system.

🙂

Don't know about that,

I have a degree in Electrical and Electronic engineering, can't imagine a Thai attending a 2 week solar install course doing a better installation job than me.

6 minutes ago, Sophon said:

A couple of things you are missing:

You wouldn't oversize your system "just to receive an extra 2.2 baht per unit", you would oversize it to make sure you had enough capacity on cloudy days, which would then result in you having excess capacity on sunny days. Might as well get some benefit from that excess capacity.

Registering for export doesn't only have the benefit of getting paid for excess capacity, it also means that you can use the grid as an extra "battery". You can export excess on sunny days, and import on cloudy days, which means that you might be able to get by with less actual battery capacity than what would otherwise be needed (therefore saving you money). Sure, that argument would work better, if you actually got the same buy-in rate as you pay when you use the grid, but the argument still holds true.

Good points but what do you do when you upgrade or add components as well as replace them? The contract specifically states you need new certifications. Also the math doesn't add up in my situation which is close to many others. I would make about 11 baht a day this month and the following 5 months (clouds). Hardly worth the effort IMO.

My Math with Storage - 10kW of panels

• Average Generation: approx 35 kWh

• Daily Consumption: 30 kWh

• Raw Surplus: +5 kWh

During the day, my 10 kW of panels will easily cover my daytime household loads while simultaneously topping off my battery to 100% even in the rainy season.

5 x 2.2 baht} = 11 baht per day

For all the extra costs and ongoing certification hassles. It simply doesn't make any financial sense. Maybe I'm missing something which I definitely can do and do often :)

Edited July 4Jul 4 by atpeace

15 minutes ago, Sophon said:

A couple of things you are missing:

You wouldn't oversize your system "just to receive an extra 2.2 baht per unit", you would oversize it to make sure you had enough capacity on cloudy days, which would then result in you having excess capacity on sunny days. Might as well get some benefit from that excess capacity.

Registering for export doesn't only have the benefit of getting paid for excess capacity, it also means that you can use the grid as an extra "battery". You can export excess on sunny days, and import on cloudy days, which means that you might be able to get by with less actual battery capacity than what would otherwise be needed (therefore saving you money). Sure, that argument would work better, if you actually got the same buy-in rate as you pay when you use the grid, but the argument still holds true.

Disagree,

You calculate your installation to cover average loading then use the grid to top up.

Don't even need a battery, use the grid as your battery (slightly naughty but cost effective), as long as you don't show negative on meter reading day (or the meter spinning backwards). I just plug in my EV on meter reading day, so the reader only ever sees the meter running in the right direction.

500bht bill last month for a 3 bed house (one aircon), electric car (1,000Km), and my electric MTB (450Km).

On a 20kbht DIY solar install. Breakeven time around 18 months.

Edited July 4Jul 4 by BritManToo

11 minutes ago, Packer said:

So in short.

Those that have a properly installed system, installed correctly. It's perfect.

Those that did a half-assed job installing it, need to modify it because they didn't do it properly the first time, didn't use use proper professional installers etc, it's not for them and their half-ass half-assed installed system.

🙂

The top posters here on this forum have had major upgrades to their professionally installed systems. Do you have solar and if so what is your setup (panels (kW) and inverter). How much did your system cost?

20 minutes ago, atpeace said:

Do you have solar

Yes.

20 minutes ago, atpeace said:

what is your setup

Professional.

🙂

2 minutes ago, Packer said:

Yes.

Professional.

🙂

Well all the people that kindly helped you when you asked for advice on this forum a few months back have had major upgrades to their professionally installed systems. So how much was your system in total and being that you are now an expert having had it for a few months - 555, please tell us all how the math adds up.

Tell us about your professionally installed system so we can be blown away.

Some people just think there superior and you seem to be the type.

38 minutes ago, atpeace said:

your professionally installed system

Yes.

38 minutes ago, atpeace said:

please tell us all how the math adds up.

Professionally installed system that obviously meets all the requirements already, as it was installed by professionals using certified approved systems, officially registered, and requires no additional expansions or adjustments within the next 10 years.

Service cost of the official check inc. 7% Vat (in Kw) : 972

Contract duration: 10 years (triple digits in months)

Time to supply 972Kw to the grid: A single digit in months.

🙂