Patent ID: 8186966

Claim:
A floating offshore wind turbine generator comprising: a nacelle that rotatably supports a rotor head; a column that supports the nacelle and yaws integrally with the nacelle; a ballast that is mounted to a lower portion of the column; and a cable that is configured to connect the ballast to a sea floor, wherein the column has a structure portion that bears a strength of the column and that has a higher strength against a load in a direction included in a plane having a rotation axis of the rotor head and an extending direction of the column than a strength of the structure portion against a load in a direction included in other planes including the extending direction of the column, and the structure portion extends from a position of 50 to 80% of a height from a sea level to the nacelle to a position of 50 to 80% of a depth from the sea level to the ballast.