The 600 MW Monsoon Wind project has entered service and is delivering electricity to Vietnam’s grid under a cross-border power sale agreement. The infrastructure comprises 133 turbines, 115 kV collector substations and a 500 kV export substation. Output targets demand equivalent to more than one million households and an estimated annual reduction of 1.3 million tonnes of CO₂. Construction and full grid connection were completed in 27 months.
A cross-border interconnection sized for exports
Power is routed from the 115 kV substations to a 500 kV substation and then along a 27-kilometre high-voltage line to the Laos–Vietnam border. The flow then connects to Vietnam Electricity’s (EVN) 500 kV network for a further 44 kilometres to the Thanh My substation. The project operates under a 25-year Power Purchase Agreement (PPA) with EVN and a 28-year concession agreement with the Government of Laos. More than a decade of wind studies guided turbine siting to optimise performance.
A consortium of international shareholders and lenders
The developer and operator is Monsoon Wind Power Company Limited, with Impact Electrons Siam as originator, alongside ACEN, BCPG Public Company Limited, STP&I Public Company Limited, Mitsubishi Corporation and its wholly owned subsidiary Diamond Generating Asia, Limited, and SMP Consultation Sole Company Limited. Financing brings together the Asian Development Bank (ADB), the Asian Infrastructure Investment Bank (AIIB), the Japan International Cooperation Agency (JICA), the Export–Import Bank of Thailand, the Hong Kong Mortgage Corporation, Sumitomo Mitsui Banking Corporation, Kasikornbank and Siam Commercial Bank. Engineering and construction were led by PowerChina, with turbines supplied by Envision Energy. The investment envelope stands at about $950mn.
The project deploys an annual $1.1mn community development fund dedicated to education, healthcare, agriculture and local infrastructure. Since construction began in March 2023, at least 1,600 jobs have been created, more than 1,000 of which for Lao nationals. Commercial operation occurred on 22 August 2025, four months ahead of the contractual deadline. “This is a historic moment for the company and the region,” said Nat Hutanuwatr, Managing Director of Monsoon Wind Power.
“Monsoon Wind, 14 years in the making, is a tribute to vision and partnership,” said Paradai Suebma, Chairwoman of Monsoon Wind Power. “We salute the foresight of Impact Electrons Siam and the tenacity of the teams.” Over its 25-year operating life, cumulative avoidance is estimated at more than 32.5 million tonnes of CO₂.
