Bangkok, 28 August 2025 – STP&I Public Company Limited (SET: STPI), a shareholder in the Monsoon Wind Power Project with approximately 16% stake, proudly marks the successful Commercial Operation Date (COD) of the largest onshore wind farm in Southeast Asia with a total capacity of 600 MW. The Monsoon Wind Power Project is the first wind farm in Lao PDR and the first cross-border renewable energy project in Asia. Supplying clean electricity from Lao PDR to Vietnam’s national grid, the project will provide renewable energy equivalent to the electricity consumption of over one million households.
What began as a bold idea in 2011 is now a milestone in Asia’s clean energy story. The Monsoon Wind Power Project has officially reached its COD on 22 August 2025, becoming the first cross-border renewable energy project in Asia. Today, this 600 MW of clean, utility-scale power flows from the mountains of southern Lao PDR into Vietnam, strengthening regional energy security, boosting economic growth, and triggering ASEAN grid aspirations by showing what’s possible when nations work together to advance regional energy connectivity.
Stretching across the Dak Cheung District of Sekong Province and the Sanxay District of Attapeu Province, 133 wind turbines rise from the ridgelines, turning steadily in the region’s strong, reliable winds. This is the product of more than a decade of detailed wind studies. Their energy travels through four 115 kV substations, is stepped up to 500 kV at the project substation, and carried along a 27-kilometre high-voltage transmission line to the Lao–Vietnam border, where it connects with Vietnam’s 500 kV Thanh My substation.
Completed in just 27 months and achieving COD four months ahead of schedule, the project represents a remarkable achievement in engineering, efficiency, and international collaboration. Developed with zero resettlement and in accordance with international best-practice environmental and social safeguard standards, the Monsoon Wind Power Project sets a benchmark for sustainable energy infrastructure in the region.
Beyond clean energy, the project has brought significant local benefits. Since construction began in March 2023, the Monsoon Wind Project has created at least 1,600 jobs, over 1,000 of which were filled by Lao nationals. These roles built valuable skills and livelihoods in the region. An annual US$1.1 million Community Development Fund supports education, healthcare, agriculture, and infrastructure improvements in the surrounding villages.
Over its 25-year operating life, it is expected to avoid more than 32.5 million tonnes of CO₂ emissions — equivalent to removing approximately 7 million cars from the road for a year, or planting about 59 million trees and allowing them to grow for 25 years.
Mr. Masthawin Charnvirakul, Managing Director of STP&I, said:
“We are honored to be a partner in this groundbreaking project — a historic achievement that delivers clean energy across borders and sets new benchmarks for sustainable infrastructure in Asia. The Monsoon Wind Power Project reflects professionalism, innovation, and true collaboration across nations. The company has full trust and confidence in both its founders and the project management team. With this solid foundation of credibility and assurance, we have made the decision to invest in this project.
At STP&I, we reaffirm our long-term commitment to clean energy and sustainability, and we are proud to contribute our expertise to projects that create lasting value for communities, economies, and the environment. This project represents not only a historic first in cross-border wind energy, but also a key milestone in STP&I’s journey to expand into clean energy, marking our big successful step toward this strategic goal”.
The project was initiated by Impact Electrons Siam (IES) and is developed and operated by Monsoon Wind Power Company Limited, a Lao-incorporated company. It is backed by an international consortium of shareholders: Impact Electrons Siam, the project’s originator, ACEN from the Philippines, BCPG Public Company Limited and STP&I Public Company Limited from Thailand, Mitsubishi Corporation of Japan and its wholly owned subsidiary, Diamond Generating Asia, Limited (DGA), and SMP Consultation Sole Company Limited from Lao PDR.
Representing an investment of approximately US$950 million, Monsoon Wind is financed by a consortium of leading international and regional lenders whose support reflects deep confidence in its technical, environmental, and economic merits. These include the Asian Development Bank (ADB, as lead arranger), Asian Infrastructure Investment Bank (AIIB), Japan International Cooperation Agency (JICA), Export–Import Bank of Thailand (EXIM Thailand), Hong Kong Mortgage Corporation (HKMC), Sumitomo Mitsui Banking Corporation (SMBC), Kasikornbank (KBANK), and Siam Commercial Bank (SCB).
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About STP&I
STP&I Public Company Limited (SET: STPI) is a leading Thai engineering, procurement, and construction (EPC) company, specializing in the fabrication of steel structures, industrial modules, and large-scale infrastructure. With decades of experience, advanced facilities, and international project delivery capability, STP&I is expanding its role in renewable energy and sustainability, supporting ASEAN’s transition to a cleaner future.
