Openhydro Group Limited
Orecon Limited
Orioka Sadama
Orme James
Orton T. Edwin
Osaka Takeshi
Osaland Espen
Osborne James C.
Oscilla Power Inc.
Ottaviano Teodoro Angelo
Ottersen Hans-Olav
Ovadia Shmuel
Ovsyankin Aleksey Vyacheslavovich
Ovsyankin Vyacheslav Viktorovich
Ozgur Cahit