Large hydro in operation General characteristics HEP Installed capacity (MW) Mean annual energy generation (GWh/yr) * Year of commissioning Louros 10.3 50 1954/64 Agras 50 35 1954 Ladhon 70 260 1955 Tavropos 130 185 1960-62 Kremasta 437 820 1966-67 Kastraki 320 530 1969 Edesseos 19 25 1970 Polyphyto 375 420 1974-75 Pournari I 300 235 1981 Assomata 108 110 1985 Sfikia 315 350* 1985-86 Stratos I 150 205 1989 Pigai Aoos 210 165 1990-91 Thissavros 420 440 + 615** 1997-98 Pournari II 31.5 45 1998 Platanovryssi 100 240 1999 Total 3045.8 4.73 *Pumped storage plant ** Pumped storage plant – upon the completion of the Platanovryssi HEP 615GWh will be added annually from pumping.