Thailand's power market just opened — what changed
For decades, a business in Thailand could buy electricity from only one source: the state utilities. From January 2026, that changed. A 2,000 MW Direct PPA pilot now lets qualified large users sign a Direct Power Purchase Agreement with a private renewable-energy developer and receive that power over the state transmission grid through Third Party Access (TPA). It is the first meaningful liberalization of Thailand's power market in decades.
What is a Direct PPA — and TPA?
A Direct PPA is a long-term contract to buy electricity directly from a specific renewable power plant, rather than from the utility's blended tariff. Third Party Access (TPA) is the mechanism that makes it possible: the generator's output is "wheeled" across the existing state grid to your site, and you pay a wheeling (network) charge for using those lines.
In short:
- A developer builds a newly developed renewable plant (solar, and in future wind or hybrid)
- That plant sells its output to your site under a Direct PPA
- The power is delivered over the state grid (TPA) for a network fee
- You receive electricity that is verifiably renewable
Why it matters now
- Green power at scale — far beyond what a single rooftop can produce
- Verifiable renewable electricity — essential for CBAM, RE100, and multinational supply-chain requirements
- A hedge against fuel-price volatility — a contracted PPA price instead of a gas-linked tariff
- Faster procurement for data centers — the pilot was shaped around hyperscale demand, with tens of billions of dollars in data-center investment already approved
Who qualifies (pilot rules)
This first round is for data centres only. The announced conditions are BOI investment promotion, an IT base load of at least 50 MW, a 10-year load and procurement plan, and intent to use 100% renewable energy. The plant supplying you must be newly developed — not an existing plant already selling to the grid.
An ordinary factory, however large, does not qualify for the pilot. Widening it to general commercial and industrial users is the stated direction of travel, but it is not the rule today. Treat a "Direct PPA for our plant" plan as something to prepare for, not something to sign.
Direct PPA vs onsite rooftop solar vs the grid
| Direct PPA (TPA) | Onsite rooftop solar | Standard grid tariff | |
|---|---|---|---|
| Scale | Large (MW to tens of MW) | Limited by roof area | Unlimited |
| Up-front cost | None (you buy energy) | Own it, or via a solar PPA | None |
| Renewable proof | Yes, contracted | Yes, on-site | No (blended supply) |
| Network charge | Yes (wheeling) | No | Included |
| Best for | 24/7 large loads, data centers | Daytime self-consumption | Baseline supply |
How to prepare
- Measure your load — a 15-minute annual load profile shows how much power you use, and when
- Set a renewable target — 100% renewable, or an onsite-plus-Direct-PPA blend
- Model the economics — the PPA price plus wheeling charge versus your current tariff, over the 10+ year term
- Choose a capable partner — one that can develop the plant, integrate onsite solar and BESS, and provide monitoring and carbon reporting
Where LEONICS fits
LEONICS designs and builds the generation side — Solar PV, BESS, and microgrid systems — and provides GridMind AI energy management together with automated carbon reporting (renewable generation and Scope 2 avoided). Whether you pursue a Direct PPA, an onsite solar + BESS system, or a blend of both, the starting point is the same: a feasibility study built on your real load data.
Frequently asked questions
Can any factory sign a Direct PPA today?
No. The 2026 pilot is limited to BOI-promoted data centres with an IT base load of at least 50 MW. An ordinary factory cannot sign one under the current rules, however large its demand. What a factory can do now is get its load profile and its onsite generation in order, so it is ready if and when eligibility widens.Do I still pay a grid charge?
Yes. A wheeling (network) charge applies for using the state transmission lines. The PPA price plus that charge is what you compare against your current tariff.Is onsite solar still worthwhile if I can sign a Direct PPA?
Usually yes. Onsite solar + BESS reduces daytime energy use and the demand charge behind the meter, while a Direct PPA covers the remaining load with green power.How long is a Direct PPA?
Typically long-term — 10 years or more — which is what secures a stable price and underpins the financing of a new renewable plant.Getting started
Before committing, model your load and compare a Direct PPA, an onsite solar + BESS system, or a blend of both. LEONICS offers a free Solar Insight Pro feasibility analysis for factories, and designs the generation, storage, and energy management to match.
See our Utility & IPP solutions or talk to the LEONICS engineering team.