600 MW Monsoon Wind onshore wind farm achieves commercial operation

The Monsoon Wind Power Project has achieved its Commercial Operation Date (COD) on 22 August 2025, delivering 600 MW of clean energy from southern Lao PDR to Vietnam.

Stretching across the Dak Cheung District of Sekong Province and the Sanxay District of Attapeu Province, 133 wind turbines rise from the ridgelines. The energy travels through four 115 kV substations, is stepped up to 500 kV at the project substation, and carried along a 27-km high-voltage transmission line to the Lao–Vietnam border, where it connects to Vietnam's 500 kV transmission system. From there, the transmission line continues another 44 km to EVN's Thanh My substation. 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.

Financing has come from a group of leading regional and global 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). The construction was led by PowerChina, with wind turbines supplied by Envision Energy.

The Monsoon Wind Power Project, initiated in 2011 in southern Lao PDR, spans 68,000 hectares in Sekong and Attapeu Provinces, with a US$950 million investment. The 600 MW project features 133 turbines, a 500 kV substation, four 115 kV substations, and cross-border grid connections. It delivered electricity to Vietnam’s EVN in August 2025, marking Asia’s first cross-border renewable energy project. Over 25 years, it will avoid 32.5 million tonnes of CO₂, equivalent to removing 7 million cars or planting 59 million trees.