Best Solar Energy Companies in Thailand
The 33 best Solar Energy companies in Thailand in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Annex Power.
- ResearchAndMarkets.com
- MarketsandMarkets
Our analysis of 100 Solar Energy companies
$30.5b in tracked funding; 83% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Solar Energy companies in Thailand
| # | Company | Disclosed funding | Last round | Stage | Founder | Founded | Tech stack | Recent signals |
|---|---|---|---|---|---|---|---|---|
| 1 | Annex Power EPC company in solar, wind and biomass segment | $30M | 158 mo ago | Deadpooled | Daniel Gaefke Founder | 2008 | — | — |
| 2 | ConstantEnergy Provider of solar financing services | — | 13 mo ago | Acquired | Franck Constant CEO and founder | 1995 | WordPressMySQLPHP+30 | — |
| 3 | B Grimm Power Developer and operator of co-generation and renewable energy power plants | — | 104 mo ago | Public | Preeyanart Soontornwata CEO & President | 1878 | — | — |
| 4 | Assyce Asia Developer of large-scale commercial solar power plants | — | — | Unfunded | Tobias Deissler CEO & MD | 2011 | — | — |
| 5 | banpu power public Banpu Power Public Company Limited or Banpu Power (BPP) then named ''Cogeneration PLC''. | — | — | Public | — | 1996 | WordPressMySQLPHP+26 | — |
| 6 | Clean Energy Asia Renewable energy project developer | — | — | Unfunded | Manfred Lafer Founder & Managing Director | 2011 | — | — |
| 7 | Eastern Power Group Eastern Power Group PCL is Thailand based holding company. | — | — | Public | — | 1990 | — | — |
| 8 | ekarat engineering Ekarat Engineering offers commercial solar modules and installs solar plants and solar rooftop. | — | — | Public | — | 1981 | WordPressMySQLPHP+15 | — |
| 9 | Energreen Asia Solar power project developer | — | — | Unfunded | — | 2015 | — | — |
| 10 | Energy Absolute Independent solar and wind power developer | — | — | Public | — | 2019 | ZohoBootstrapVuetify+18 | — |
Top 3 Solar Energy companies in Thailand
#1
Deadpooled · Bangkok, Bangkok · founded 2008$30Mraised▾
Annex Power is an EPC service provider for solar photovoltaic (PV), wind and biogas power projects and has an operational presence in Thailand, Philippines and Indonesia. Annex is a portfolio company of Asia Cleantech recently backed by Armstrong Asset Management. The company provides solar modules, solar on-grid kits and off-grid kits, wind hybrid kits, wind turbines and generators, solar charge controllers, inverters, solar mounting structures, solar thermal systems and heat pumps, photovoltaic modules, batteries and other such products.
- Sep 2013PE$30M
#2
Acquired · Bangkok, Bangkok · founded 1995 · 69 employees—raised▾
Provider of solar financing services
#3
Public · Bangkok, Bangkok · founded 1878 · 700 employees—raised▾
Developer and operator of co-generation and renewable energy power plants. This company focuses on cleaner energy production, investing in and managing power plants to provide electricity. They prioritize sustainable practices and aim to contribute to infrastructure development and energy security. The company's operations encompass the entire lifecycle of power plant development, from initial planning and construction to ongoing maintenance and operation. A key aspect of their business model is establishing strong partnerships to facilitate growth and expansion.
Funding & investor landscape
Market landscape — 10 sub-themes by coverage
Share of Solar Energy coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Solar Photovoltaics is moving in Thailand
A read on the academic research around Solar Photovoltaics — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 401 Thailand-affiliated papers.
- Ministry of Education96
- Ministry of Energy40
- Chulalongkorn University22
- King Mongkut's University of Technology Thonburi22
- Chiang Mai University20
- Solar cell1→8
- Optoelectronics1→5
- Quantum dot1→4
- Solar energy1→79
- Perovskite (structure)1→22
- Solar cell2→18
- Energy conversion efficiency2→15
- Evaporation1→6
- Solar energy15
- Renewable energy11
- Photovoltaic system10
- Electricity7
- Electrification6
Where solar pv is researched across Thailand
Location clusters by institution affiliation — each city's volume, stance tone, and a quick read on its hot topic, what's advancing, the opening opportunity, and the main concern.
Common questions
Riya reads income statements for fun. She covers the real money in a sector — revenue, growth, who actually earns — and never met a vague claim she didn't want a number for.