http://en.wikipedia.org/wiki/Karun-3_Dam

“The purpose of the dam is for power generation and flood control. The Karun III power generators are connected to the national power network as the peak power generation. With this power plant being operated, with the capacity of 2,280 MW,^[4] and an average annual electric power generation of 4,137 GWh, a major portion of the electric power shortage in the country will be met.”