The project, developed by DT5.1 Energy JSC, a Xuan Cau Holdings subsidiary, will have an installed capacity of 450 MW and is scheduled to begin commercial operations in December 2027.

The solar farm will be built on semi-submerged land around Dau Tieng Reservoir that had previously been used mainly for cassava cultivation.

The developer said the project would make more efficient use of the site's abundant solar resources while creating new economic opportunities for the local area.

Once operational, the plant is expected to generate approximately 808 gigawatt-hours (GWh) of electricity annually, supplying clean power to Vietnam's national grid.

Addressing the groundbreaking ceremony, To Dung, chairman of Xuan Cau Holdings, said that this is one of the first projects to implement the direct power purchase agreement mechanism, which allows renewable energy producers to sell electricity directly to large consumers.

He said the project would not only support renewable power producers and large electricity consumers but also contribute to the development of Vietnam's competitive electricity market.

Xuan Cau Holdings is already one of Vietnam's major solar investors. In 2018, the company developed the Dau Tieng 1, 2 and 3 solar complex with a combined capacity of 500 MW, which was introduced at the time as Southeast Asia's largest solar power complex.

These projects occupy around 720 hectares, equivalent to about 2.6% of Dau Tieng Reservoir's surface area, and were completed in roughly 10 months, helping establish Tay Ninh as one of Vietnam's leading solar energy hubs.

Long An and Tay Ninh provinces were merged last July to form the new Tay Ninh which borders Dong Nai city, Dong Thap province, Ho Chi Minh City, and Cambodia.