A total of 3,019 MW in new offshore wind capacity came online in European waters in 2015, more than double the capacity connected to the grid in 2014. Europe's total offshore wind capacity is now 11,027 MW according to the report.
A further 3,034 MW of capacity - spread across ten projects - reached final investment decision last year, a twofold increase on 2014.
Giles Dickson, Chief Executive Officer of the European Wind Energy Association, said: "It's good to see the high level of investments in offshore wind in Europe in 2015. The 3GW of new capacity additions is also encouraging though it includes a large backlog of grid connections from 2014, especially in Germany."
Germany (2,282 MW), the United Kingdom (556 MW) and the Netherlands (180 MW) were the three countries to grid-connect new offshore wind turbines in 2015 with 14 projects reaching completion. Work is ongoing on a further 6 projects in Germany, the UK and the Netherlands, which will contribute an additional 1.9GW in capacity.
With a net addition of 754 wind turbines fully grid connected in 2015, the average machine size rose to 4.2 MW from 3.7 MW a year earlier as manufacturers continue to develop larger models with higher energy capture.
Dickson said: "New capacity additions will be lower in 2016 than 2015 though should then rebound, and we can expect to have over 20GW offshore wind in Europe by 2020. The real question is what happens after 2020. The industry is making real progress in reducing costs. We need Governments to give us a clear vision of the volumes they envisage long term and the regulatory framework they'll apply to drive the necessary investments. Active collaboration between governments is also key to align their efforts to develop the sector in the North Sea and Baltic."