The plants are located in nine counties and have a total installed capacity of 20.3 MW.
Interested bidders have until September 3 to file offers which will be opened between September 8 and 11.
Hidroelectrica has been selling 21 micro power plants for 69.3 million lei (EUR15.7 million) since July 2013.
Hidrolectrica, the country’s largest power producer, has 80.05% of its shares in the hand of the Energy Department, while investment fund Fondul Proprietatea (FP. RO) holds a 19.94% stake. The company runs units with a total installed capacity of 6,400 megawatts and covers around 30% of Romania’s power consumption.
Hydroelectrica was court-ordered into a second insolvency process in February this year, less than eight months after completing a one-year reorganization process.