The relevant contract was signed on January 17 in Beijing, on the sidelines of Tajik President Imomali Rakhomov's visit to the Chinese capital.
The project will reportedly be funded through a $200 million, low-interest Chinese loan.
The Zarafshan, or Yavan, plant should produce some 600 million kilowatt hours of electricity a year.
Tajikistan is regularly hit by electricity shortages, and is pursuing greater self-sufficiency in the energy sector. It is largely dependent on Kyrgyz energy supplies that are transported through Uzbekistan.
Tajik authorities recently imposed energy restrictions on the public, although the reasons are unclear. Some reports have suggested that freezing temperatures triggered an unexpected increase in electricity consumption. Other reports said a fall in the level of the country's main water reservoir prompted the limitations.
Tajikistan was hit by severe power shortages in late November and early December.
(Asia Plus, Avesta, ferghana.ru)