The first unit of the Sangtoudeh-2 hydropower plant in Tajikistan has begun commercial operations.
The project, which began in 2006, has been built at a cost of $220m by an unnamed Iran based company.
Iran has invested $180m, whereas Tajikistan has provided $40m towards construction costs of the project.
The two-unit hydro power plant will have an output capacity of 110MW for each unit, reports the Islamic Republic News Agency.
Iran will receive revenue generated by the plant for a period of 12 years, following which, the plant's ownership will be transferred to Tajikistan.