Thailand’s 10,000 MW Rooftop Solar Plan: What It Means for Homes

What did the energy minister actually announce?

On 19 September 2026, Energy Minister Akanat Promphan said Thailand should reserve 10,000 megawatts of rooftop solar capacity for Thai households under the forthcoming Power Development Plan 2026 (PDP2026). Each home would be limited to about 5 kilowatts. The point is to spread the capacity across millions of roofs instead of a few investors.

Speaking on the TV programme “Talking with Anutin’s Cabinet,” he framed it as a shift away from big solar farms. “The power plan must not be left solely to big business,” he said, according to Nation Thailand.

The proposal has four practical pieces:

• Bill credits. The state would buy surplus output and credit its value against your bill in the same billing period. That helps people who are out at work all day and reduces the need for a battery.
• Financing. Options range from partial grants to loans repaid from generation revenue.
• One-stop approvals. You’d deal only with your distribution utility, through online forms. The target is about one week for self-use systems and one month for systems that sell power back.
• Safety checks. Utilities would inspect equipment, wiring and smart meters before connection, to cut fire risk from substandard kit.

How big is 10,000 MW? At 5 kW per home, it works out to roughly 2 million households (our calculation). That’s a very different scale from anything Thailand has tried before.

Is this a proposal, a program, or a law?

It’s a proposal. The 10,000 MW figure sits inside a draft power plan that hasn’t been adopted. Three separate things are moving at once, and news coverage tends to blur them together. Here’s where each stands as of late September 2026.

Live now: the 500 MW net-billing round

The program homeowners can join today is the 2026 household round, Solar Phak Prachachon 2569. MEA and PEA opened applications on 1 July 2026. It has a national target of 500 MW, a 5 kW export cap per meter, and a buyback rate of 2.20 THB/kWh from MEA. It’s first-come, first-served, so it will fill.

It replaced an older cumulative cap of 90 MW that was meant to last until 2030. According to Energy News Center reporting, demand used it up by 2024. That early sell-out is the strongest evidence that Thai households actually want this.

Coming soon: the 50,000-baht grant

Separately, the Finance Ministry has planned a non-repayable grant of 50,000 baht per household, with state-bank loans for the rest. The Bangkok Post reports registration opens in mid-October, initially targeting 1 million households. It’s funded with 50 billion baht from an energy-transition budget.

Final rules for the grant, including eligibility and installer lists, weren’t published when this was written. Treat it as announced but not yet open.

Still a draft: PDP2026 and the 10,000 MW target

PDP2026 went to public hearing on 8 September. EPPO will revise the draft before presenting it to the NEPC for approval. A power development plan is a target, not a law. Even after adoption, the 10,000 MW would still need an ERC purchase announcement before anyone could apply.

For context, Thailand had 3,310 MWp of rooftop solar installed as of 2024, according to IEA-PVPS. That covers homes, shops and factories combined. The household reserve alone would be about three times that figure, and 20 times the current round (our calculation).

Do the numbers work for a Thai household?

They can, but the official estimates disagree with each other, and the most optimistic ones depend on details that aren’t settled yet. Payback claims currently range from three years to ten. Which one applies to you depends on how much power you use during the day.

Three payback estimates, three assumptions

• Finance Minister Ekniti: the investment would pay for itself within three to four years. That assumes the 50,000-baht grant and a home with a bill of 3,000–4,000 baht a month.
• Energy Minister Akanat: under his financing example, households would finish paying for the equipment in approximately seven to ten years.
• IEEFA, the energy think tank: residential payback under today’s rules is around six to seven years without a grant.

Those aren’t contradictions so much as different households and different subsidy assumptions. A family with a 4,000-baht bill who uses the air-con at home all day is Ekniti’s case. A retired couple with a small bill is a very different one.

Is 600–700 kWh a month realistic?

Akanat’s example says a 5 kW system could generate around 600–700 kilowatt-hours a month, worth a little over 2,000 baht. That’s at the top of what Thai rooftops normally produce. Installer data puts yield at 1,300–1,500 kWh per kWp per year.

For a 5 kW system, that’s roughly 540–625 kWh a month (our calculation). A shaded Bangkok roof will land at the lower end. So budget on the lower figure, and treat the minister’s number as a sunny-roof best case.

The 3-baht tariff cuts both ways

Here’s a catch almost nobody is discussing. From September bills, the first 200 units a household uses are capped at no more than 3 baht per unit, down from a base rate of 3.2484 THB/kWh. That’s good news for your bill. It also means each solar unit that replaces those first 200 units saves you less than before.

Low-use homes feel this most. If you use about 200 units a month, solar mostly displaces cheap 3-baht power, and anything extra sells for 2.20 baht. Heavy users gain more, because solar knocks out units in the 4.22 THB/kWh and 4.42 THB/kWh tiers first.

What could it mean for Thailand’s future?

If it happens at scale, household solar would change who owns Thailand’s power system. Akanat calls them “people’s power plants.” The draft PDP2026 aims to raise clean energy’s share of the mix from about 20% to nearly 50% within ten years, and to at least 65% over the longer term.

Less exposure to imported gas

Energy security is the strongest argument for the plan. Natural gas supplies 66 percent of Thailand’s electricity generation, according to IEEFA. Falling domestic output has pushed the country toward LNG bought on the volatile spot market.

Every kilowatt-hour made on a roof at midday is one that doesn’t need imported gas. That’s why the Finance Ministry is funding the grant from its energy-transition budget, not its welfare budget.

A grid built for two-way flows

The draft plan already assumes this change. Its first phase adds 24,300MW of solar power and 14,500MW of battery storage, and it describes consumers as “prosumers” who both use and produce power. The minister hasn’t said how much of the 10,000 MW household reserve counts toward that solar figure.

Rooftop solar also fits the government’s wider plan to open up the power market. On July 15, 2026, the NEPC approved expanding direct power purchase agreements beyond data centres. If both reforms land, Thai households and factories would have far more choice over who makes their electricity. You can read how this plan compares with the last one in our Power Development Plan overview.

What are the strongest arguments against it?

The serious objections aren’t about whether solar is good. They’re about who benefits, who pays for the grid, and whether net billing gives households a fair deal. Each is a real risk the plan hasn’t fully answered yet.

Night-time households gain little

Areeporn Asawinpongphan of TDRI, a supporter of the policy overall, still flags its limits. “For households that use relatively little electricity during the day and consume more at night, installing rooftop solar without a battery storage system would provide them with very little benefit,” she told the Bangkok Post.

There’s a fairness question hidden in that. Homeowners with large, sunny roofs and daytime use will benefit most. Renters and condo dwellers can’t take part at all.

Net billing, not net metering

Surplus units are bought at 2.20 THB/kWh, well below what you pay to import them. Nothing announced so far says the new scheme would credit exports kWh-for-kWh at retail price. IEEFA argues that switching to net metering could cut payback to approximately four years. The utilities argue the opposite: full retail credit shifts grid costs onto households without solar.

Contract length matters too. Current household contracts run 10 years, and the ministry has said it wants to extend household solar power purchase agreements beyond their current 10-year term. Solar farms get 25 years.

Someone has to pay for the grid

Two million small generators need smart meters, stronger local transformers and storage. The draft plan’s most renewable-heavy scenario would need grid investment of up to 700 billion baht. It also projects tariffs of 4.11–4.58 baht per unit by 2050 across its scenarios.

Midday oversupply is already a problem, as we covered in solar curtailment in Thailand. Adding millions of rooftops without storage could make it worse. The utilities also lose sales revenue with every rooftop, which the minister admitted: “Allocating 10,000 megawatts to the public will certainly have an impact.”

What should homeowners do right now?

Don’t wait for a program that doesn’t exist yet if the numbers already work for you. Size a system for the power you use during the day, apply for the programs that are live today, and keep the grant as a possible bonus rather than the reason to buy.

• Check the 500 MW round. Apply through MEA’s MyEnergy portal or PEA while quota remains. The export cap is 5 kW per meter.
• Claim the tax deduction. Households can deduct up to 200,000 THB for rooftop solar, which is gazetted law.
• Watch the grant rules. Registration for the 50,000-baht grant is due in mid-October. Confirm whether it can be combined with the tax deduction before you sign an installer contract.
• Use a utility-approved installer. Inspection before grid connection is mandatory, and substandard work won’t pass.

Thailand’s renewable energy policy has promised a lot before and delivered much less. This time a live buyback round, a funded grant and a draft national plan are all pointing the same way. Whether 10,000 MW actually reaches Thai roofs depends on what the NEPC approves and on who ends up paying for the grid.

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