An offshore electricity production assembly comprising a floating platform, a wind turbine fixed to the floating platform, and inclined mooring tendons (18A, 18B, 18C) connecting the floating platform to a seabed, the floating platform comprising: - a tubular central buoyant column extending along a longitudinal axis intended to be vertical, the column having an immersed portion defining a first average external diameter which is the external diameter of a cylindrical tube having the same volume as the immersed portion of the column, and - a plurality of tubular radial buoyant pontoons (28A, 28B, 28C) protruding from the column along radial axes (R1, R2, R3) spaced around the longitudinal axis, each of the pontoons (28A, 28B, 28C) defining a second average external diameter which is the external diameter of a cylindrical tube having the same volume as the considered pontoon (28A, 28B, 28C), the pontoons (28A, 28B, 28C) being immersed in a body of water, wherein the first average external diameter is larger than the second average external diameter, wherein the floating platform is subject to a buoyancy force, the column and the pontoons (28A; 28B, 28C) being configured to provide at least 90% of said buoyancy force, wherein each of the radial axes (R1, R2, R3) defines an angle (β) with a transverse plan perpendicular to the longitudinal axis, the angle (β) being comprised between - 10° and +10°, and wherein the first average external diameter divided by the second average external diameter is comprised between 1.4 and 2.3. - a tubular central buoyant column extending along a longitudinal axis intended to be vertical, the column having an immersed portion defining a first average external diameter which is the external diameter of a cylindrical tube having the same volume as the immersed portion of the column, and - a plurality of tubular radial buoyant pontoons (28A, 28B, 28C) protruding from the column along radial axes (R1, R2, R3) spaced around the longitudinal axis, each of the pontoons (28A, 28B, 28C) defining a second average external diameter which is the external diameter of a cylindrical tube having the same volume as the considered pontoon (28A, 28B, 28C), the pontoons (28A, 28B, 28C) being immersed in a body of water, wherein the first average external diameter is larger than the second average external diameter, wherein the floating platform is subject to a buoyancy force, the column and the pontoons (28A; 28B, 28C) being configured to provide at least 90% of said buoyancy force, wherein each of the radial axes (R1, R2, R3) defines an angle (β) with a transverse plan perpendicular to the longitudinal axis, the angle (β) being comprised between - 10° and +10°, and wherein the first average external diameter divided by the second average external diameter is comprised between 1.4 and 2.3. wherein the floating platform is subject to a buoyancy force, the column and the pontoons (28A; 28B, 28C) being configured to provide at least 90% of said buoyancy force, wherein each of the radial axes (R1, R2, R3) defines an angle (β) with a transverse plan perpendicular to the longitudinal axis, the angle (β) being comprised between - 10° and +10°, and wherein the first average external diameter divided by the second average external diameter is comprised between 1.4 and 2.3.