The demonstrator, comprising a 2MW Vestas turbine mounted on Ideol's ring-shaped concrete platform, came online last September at the SEM-REV test site, off the west coast of France.
Since then production has been ramped up progressively, according to a "carefully planned commissioning protocol", the company said.
Data collected from more than 1,000 sensors has been "fully in line with the company's initial simulations".
During the first six months of 2019, Floatgen produced 2.2GWh of electricity and withstood wave heights of up to 6.2 metres.
It also continued generating during June's storm Miguel, which saw significant wave heights of 4.4 metres and winds gusting up to 103km per hour (km/h), Ideol reported.
Overall, the turbine achieved an average availability of over 90% in the second quarter of 2019.
These results reflect the platform's "excellent seafaring performance" and the absence of the impact of movements induced by the floater, giving a "better than onshore power curve", the company said.
They also reflect Ideol's ability to carry out maintenance in significant wave heights up to 2.3 metres, thanks to the floater's "unique easy-access design".
Last month, Ideol signed an agreement with Japan's Shizen Energy to collaborate on a commercial-scale project off Kyushum, and unveiled a concept for a floating offshore substation in partnership with France's Atlantique Offshore Energy
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