Only companies with annual turnover of at least EUR100 million over the past three years and companies that have built hydropower production units or operated such units over in the last five years may submit bids.
Potential investors have until September 11 to file offers.
Complexul Energetic Huneadoara is controlled by the Economy Ministry.
State-owned hydropower producer Hidroelectrica sold 14 micro-hydro facilities for EUR10.6 million Monday and plans to sell more units by the end of the year.