The company said it had 22 more Siemens 3.6MW 107-metre rotor turbines to bring online expected to finish the task by the end of this month.
Gwynt y Mor has been taking a number of steps towards completion, at which stage it will become the world's second biggest project behind the 630MW London Array.
Last month, the European Investment Bank provided £51 million (€70 million) to a Balfour Beatty-led consortium to support the acquisition of the Gwynt y Mor transmission licence.
Additionally, a floating Lidar (light detection and ranging) trial backed by RWE Innogy and the UK government-funded Carbon Trust was completed at the project at the end of February.