The project was implemented to help the impoverished Central Asian nation cope with expected energy shortages
Last winter was very cruel to millions of Tajiks who struggled to survive without heating and electricity in their homes.
An energy deficit could also hurt Tajikistan's electricity-heavy aluminum production, which accounts for 75 percent of its hard currency earnings.
Tajik leader Imomali Rakhmon said the new units would allow Tajiks to use electricity for at least eight hours a day this winter, compared to just four hours a day last year.
The entire Sangtuda project, where Russia is due to construct one more production unit, costs $720 million, the Moscow Times reported.