Thailand Power Development Plan 2024-2037: Complete Overview
Thailand’s most-quoted energy document was never actually adopted. The draft Power Development Plan for 2024-2037 set the 2037 horizon that nearly every renewable-energy article about Thailand now references. It promised a renewable share of 51% of electricity production, up from 36% under the previous plan (Nation Thailand). Then it stalled, and in September 2026 the Ministry of Energy took a different draft to public hearing entirely. Here’s what the PDP 2037 roadmap actually contained, why it drew objections, and which of its numbers survived into the plan that replaced it.
TL;DR: Thailand’s draft PDP 2024-2037 targeted 51% renewable electricity by 2037, versus 36% under PDP 2018, according to Nation Thailand (Nation Thailand). It was never approved. A successor draft, PDP 2026-2050, went to public hearing on 8 September 2026 and carries forward almost the same solar figure with far more battery storage.
What Is Thailand’s Power Development Plan?
The Power Development Plan is the national blueprint for how much generating capacity Thailand builds, from which fuels, and by when. The 2024 draft would have left the country holding 112,391 MW of contracted capacity in 2037 (HaRDstories). Every large plant, import contract, and storage project traces back to it.
So how does a document like this get made? Ministry of Energy planners revise the PDP every few years. Each version sets a demand forecast, then allocates capacity to meet that forecast with a reserve cushion on top. State utilities and private developers build against those allocations, so the document decides billions of baht of investment long before any concrete is poured.
That makes the PDP the backbone of Thai energy policy. It’s also why the plan matters to anyone paying an electricity bill — capacity approved in a PDP gets paid for through tariffs for decades, whether or not the plant ends up running.
One detail trips people up constantly. A PDP is a target document, not a law. It doesn’t pass through the Royal Gazette, and endorsement by the National Energy Policy Council doesn’t make its capacity numbers binding. Treating a PDP figure as a commitment is the single most common error in coverage of Thai renewable energy policy.
What Did PDP 2024-2037 Actually Target?
The draft laid out plans for 77,407 MW of new power generation capacity (EXRI (Energy Xchange Research Institute)), of which 34,851 MW was renewable (EXRI (Energy Xchange Research Institute)). Solar dominated that allocation at 24,412 MW, followed by 5,345 MW of wind, 2,681 MW of floating solar, 1,045 MW of biomass, and 936 MW of biogas (EXRI (Energy Xchange Research Institute)). Peak demand was forecast to hit 56,133 MW by 2037 (EXRI (Energy Xchange Research Institute)).
Storage was the genuinely new element. The plan wrote in 10,485 MW of battery energy storage plus 2,472 MW of pumped-storage hydropower (EXRI (Energy Xchange Research Institute)) — an admission that a grid running on this much solar needs somewhere to put midday surplus.
It wasn’t a renewables-only plan. Eight new combined-cycle gas plants totalling 6,300 megawatts were included (Thailand Development Research Institute (TDRI)), along with 3,500 megawatts of new imported hydropower from neighbouring countries (Thailand Development Research Institute (TDRI)). The draft also reserved 600 MW for nuclear small modular reactors (EXRI (Energy Xchange Research Institute)), Thailand’s first appearance of nuclear capacity in a live planning document.
Read the allocation as a ratio and the plan’s real character shows up. Solar and gas together carried most of the growth, while wind took barely a fifth of solar’s allocation. That isn’t a wind-resource judgement dressed up as policy neutrality — it’s a cost ranking. Thai onshore wind sites deliver lower capacity factors than tropical sun, so planners bought megawatts where they were cheapest.
Was PDP 2024-2037 Ever Approved?
No. The draft went to public hearing in mid-2024 and never reached final approval by the National Energy Policy Council or the Cabinet. Its successor is now the live document: a draft PDP for 2026-2050 that proposes roughly 50,900 megawatts of new capacity in a first phase running 2026 to 2037 (Nation Thailand).
That successor draft was unveiled at a public hearing in Bangkok on 8 September 2026 (Nation Thailand). As of late September 2026, it hadn’t been submitted for final approval either. Thailand has therefore spent more than two years operating without a current, adopted power development plan.
The gap has real consequences. A Ministry of Energy proposal to open at least 400 MW per year of residential rooftop-solar purchases () was made contingent on the PDP being finalised, and it simply expired waiting. Anything that depended on the plan being signed off is still waiting.
Here’s the part most summaries miss: the 2037 capacity numbers didn’t die with the 2024 draft. The successor’s first phase covers the identical 2026-2037 window and forecasts 2037 peak demand at 57,273MW (Nation Thailand), barely above the older draft’s 56,133 MW (EXRI (Energy Xchange Research Institute)) — a gap of about 2% (). Two separate drafting exercises, two years apart, landed on essentially the same number that drives everything else. So when you see “PDP 2037” cited, the horizon is still meaningful even though the document behind it changed.
Why Did Critics Push Back on the Plan?
Cost of surplus capacity was the loudest objection. Thailand’s electricity reserve margin already sits at about 25%, a figure the permanent secretary for energy confirmed at the September 2026 hearing (Nation Thailand). Over just four months in 2023, capacity payments to plants that weren’t generating exceeded 6,100 million baht (HaRDstories).
The Thailand Development Research Institute argued the demand forecast was too high and recommended aligning it with central-bank growth estimates before approving new plants. Build to an inflated forecast and who pays? Consumers do, twice — once for the plant, again for keeping it on standby.
Fuel-import exposure drew separate criticism. Under the draft, imported LNG would supply 43% of gas used for power generation by 2037, up from 33% in 2024 (Thailand Development Research Institute (TDRI)). That trades domestic gas depletion for exposure to a volatile global spot market.
Imported hydro raised price questions too. The Pak Beng project carries a purchase price of up to 2.92 baht per unit (Thailand Development Research Institute (TDRI)), well above older Lao hydro contracts. Thailand already imports enough from Lao PDR to cover 15% of its electricity demand (Ember), so each new cross-border contract deepens a dependence that’s hard to unwind.
How Does the Draft PDP 2026 Compare?
The successor keeps solar almost unchanged at 24,300MW for 2026-2037 (Nation Thailand) but pushes battery storage to 14,500MW (Nation Thailand) — roughly 4,015 MW more than the 2024 draft allocated (). Storage, not generation, is where two years of planning changed the answer. Why? Because a grid absorbing that much solar hits its ceiling on flexibility, not on panels. Learn more about solar curtailment.
Two allocations moved the other way. Wind fell to 2,700MW of wind power (Nation Thailand), roughly half the 2024 draft’s 5,345 MW, while gas rose: the newer plan adds 9,100MW of combined-cycle gas turbine capacity (Nation Thailand) against 6,300 megawatts before. More storage bought more solar headroom, not less gas.
Emissions get an explicit trajectory this time. The draft targets cutting power-sector carbon dioxide from about 80 million tonnes today to 19 million tonnes by 2050 (Nation Thailand), the first PDP to carry a dated decarbonisation path rather than a capacity share alone.
Nuclear ambition expanded sharply. Where the 2024 draft reserved 600 MW, the new one envisages up to 9,000MW of small modular nuclear capacity by 2050 (Nation Thailand). Whether Thailand can license, site, and finance that is an open question — no commercial SMR fleet exists anywhere at that scale yet.
There’s a tariff commitment attached as well. The draft aims to hold the average electricity tariff across the plan period at no more than 3.88 baht per kilowatt-hour (Nation Thailand). Read that carefully — it’s a plan-period system average, not the rate any household pays per unit. Residential bills run on progressive tiers and a separate fuel adjustment charge.
What Does the 51% Renewable Target Really Mean?
It means 51% of electricity production by 2037, against 36% under PDP 2018 (Nation Thailand). Fifty-one percent of what, exactly? The denominator matters, and it’s been reported inconsistently. Different outlets have attached this same figure to installed capacity and to electricity demand instead. Generation share is the definition to use.
The distance to travel is the real story. Fossil fuels supplied over 80% of Thai electricity generation in 2024, with natural gas alone at around 68% (Ember). Installed solar capacity that year was just 3.4 GW (Ember).
Put those two figures side by side and the target’s difficulty becomes concrete. The planned solar addition is roughly seven times everything Thailand had installed by 2024 (). Hitting 51% doesn’t require a policy tweak — it requires building more solar in thirteen years than the country managed in the previous twenty, while gas plants approved under the same plan keep running.
What Does the PDP Mean for Households and Rooftop Solar?
Very little, directly — and that’s the useful finding. Neither draft allocates capacity to residential rooftop solar as a line item. The programme homeowners can actually join runs on a separate track: a 500 MW national round () approved by the energy council and then implemented by the Energy Regulatory Commission.
That round pays 2.20 THB/kWh for exported solar energy under a net-billing arrangement, with exports capped at 5 kW per meter. See our guide to feed-in tariff. It opened in July 2026 on a first-come, first-served basis. Notice what happened there: the regulator went ahead without waiting for a finalised PDP.
The gap that leaves is notable. A plan that allocates 24,412 MW of utility-scale solar (EXRI (Energy Xchange Research Institute)) says nothing about the millions of rooftops that could host panels, which is why rooftop policy ended up on its own track in the first place. Distributed generation reduces the peak demand the PDP is built to serve, yet it enters the plan only as a demand forecast adjustment.
So the practical read for a household is simple. Watch the ERC announcements, not the PDP headlines. The plan shapes what you’ll pay through tariffs over the next decade, but the incentives you can claim this year come from regulatory decisions that now move independently of it.
What Happens Next With the Energy Roadmap?
The draft PDP 2026-2050 needs endorsement from the National Energy Policy Council and then the Cabinet before it guides anything. It proposes about 50,900 megawatts of new capacity in its 2026-2037 first phase (Nation Thailand), and the September 2026 hearing was the public-comment stage of that process, not the final word.
Two things are worth watching if you follow Thai energy policy. First, whether the demand forecast gets revised downward — that’s the criticism with the most money attached, given a reserve margin already near 25% (Nation Thailand). Second, whether the nuclear component survives scrutiny, because 9,000MW of small modular capacity by 2050 (Nation Thailand) implies a licensing framework Thailand doesn’t yet have.
The deeper shift is structural. Thailand spent two years unable to adopt a plan, and the energy regulator responded by acting without one — opening a 500 MW rooftop round () through its own authority. The PDP still governs large generation, but the fast-moving distributed layer has quietly stopped waiting for it. Expect more decisions to arrive that way.
For anyone tracking the 51% renewable target (Nation Thailand), the honest position is that the destination is broadly agreed and the route isn’t. Solar’s share of planned capacity held steady across two independent drafting rounds. What changed was storage, gas, and the willingness to name a carbon number — 19 million tonnes of power-sector CO2 by 2050 (Nation Thailand), down from about 80 million tonnes now.
Frequently Asked Questions
Is PDP 2024-2037 still Thailand’s official energy plan?
No. The 2024 draft never received final approval, and a successor draft covering 2026-2050 went to public hearing on 8 September 2026 (Nation Thailand). That newer draft was also still awaiting approval as of late September 2026, leaving Thailand without a currently adopted power development plan.
How much solar does Thailand plan to build by 2037?
The 2024 draft allocated 24,412 MW of solar plus 2,681 MW of floating solar (EXRI (Energy Xchange Research Institute)). The successor draft keeps the figure nearly identical at 24,300MW for its 2026-2037 phase (Nation Thailand). Both represent a very large multiple of the 3.4 GW installed in 2024 (Ember).
Does the PDP include nuclear power?
Yes. The 2024 draft reserved 600 MW for small modular reactors (EXRI (Energy Xchange Research Institute)). The 2026 draft raises that ambition substantially, envisaging up to 9,000MW of small modular nuclear capacity by 2050 (Nation Thailand). No reactor has been licensed, sited, or financed in Thailand to date.
Why do critics say the plan overbuilds capacity?
Thailand’s reserve margin already runs near 25% (Nation Thailand), and capacity payments to non-generating plants topped 6,100 million baht across four months of 2023 (HaRDstories). Researchers argued the demand forecast was inflated, meaning consumers fund standby plants the system doesn’t need.
Will the PDP change my electricity bill?
Indirectly, over years. The 2026 draft targets a plan-period average tariff of no more than 3.88 baht per kilowatt-hour (Nation Thailand), but that’s a system-wide average, not a household rate. Residential bills follow progressive tier rates plus a separately billed fuel adjustment charge.
The Short Version
Thailand’s renewable energy policy has an unusual problem: its headline roadmap isn’t in force, yet its numbers are treated as settled fact everywhere.
- The draft PDP 2024-2037 targeted 51% renewable electricity generation by 2037, up from 36% under PDP 2018 (Nation Thailand)
- It allocated 34,851 MW of new renewable capacity (EXRI (Energy Xchange Research Institute)), led by 24,412 MW of solar (EXRI (Energy Xchange Research Institute))
- It was never approved; a draft PDP 2026-2050 reached public hearing on 8 September 2026 (Nation Thailand)
- The successor keeps solar flat at 24,300MW but lifts battery storage to 14,500MW (Nation Thailand)
- Rooftop solar incentives now move through the ERC independently of the PDP ()
Check any PDP figure you see quoted against the draft it came from and the approval stage it reached. A capacity number in an unapproved plan is a proposal, not a promise — and in Thailand right now, that distinction covers the entire roadmap.