(Phnom Penh): Keo Rattanak, Minister of Mines and Energy, announced the commencement of the construction of the 1,000-megawatt Upper Tatay Pumped Storage Hydropower Project, which is anticipated to be completed in 2029.

The project, launched under Prime Minister Hun Manet, is Cambodia’s first pumped-storage hydropower facility and marks a major step in energy development. It builds on earlier efforts by former Prime Minister Hun Sen to expand the country’s power capacity.

According to Minister Keo Rattanak, unlike traditional dams, the system works like a large-scale battery, storing excess electricity and releasing it during peak demand. This is expected to lower costs and support renewable energy integration.

Backed by Chinese investment of nearly USD 1 billion, the project is projected to generate over USD 600 million in tax revenue over 40 years. In a message posted on his social media, Chinese Ambassador Wang Wenbin said it will strengthen grid stability and help Cambodia reach its target of 70% clean energy by 2030.

Once completed, the plant could become one of Southeast Asia’s largest pumped-storage facilities, boosting energy security and enabling further expansion of solar and wind power.
=FRESH NEWS