May 8 (SeeNews) - Romanian hydro power producer Hidroelectrica said on Tuesday it has signed a 4.4 million lei ($1.1 million/ 0.94 million euro) contract for the overhaul of five hydro power plants (HPPs) of 110 kW each belonging to the Ramnicu Valcea hydro-electric substation. The upgrades will be financed from the company's own sources, Hidroelectrica said in a press release.