Coc San is a run-of-the-river 30 MW hydro power project located in the Dum River Valley, a tributary of the Hong (Red) River, about 300 kilometres northwest of Hanoi in Lao Cai province. The project commenced operations in April 2016 and is operating under the Avoided Cost Tariff regime.

Nexif Energy led the development of the project and commenced construction, while acting as the manager of InfraCo Asia, a company of the Private Infrastructure Development Group (PIDG).

In 2016, Nexif Energy acquired a majority ownership in the project and its commissioning was completed and commercial operations commenced.

Ratch Group PCL acquired all of Nexif Energy’s interest in the project on 20 December 2022