Raisi opened the dam on Monday, during a trip to the province.
Chamshir Dam and Power Plant is located 25 kilometers to the southeast of the city of Gachsaran, and has been built on Zohreh River.
The plant will produce 482 gigawatts of electricity each year. And the dam will help downstream land become arable. It will also help attract tourists to the area, among other objectives.
The inauguration comes despite warnings by environmental officials and activists against what they call the harms that the dam could do to the nature.
Critics say the dam could salinate the agricultural land nearby and lead to sand storms.
The government rejects those concerns as groundless.